Marine Diesel Two Stroke Engine - How it Works!

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Learn about large two stroke marine diesel engines! These types of engine power some of the world’s largest ships. This 3D animation video gives you a unique look at just how these huge machines work. Ideal for anyone interested in marine engineering!
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▶️ Introduction
This video explains how large marine two stroke diesel engines work. We look at all of the main parts associated with the engine, how it works, and some of its typical characteristics e.g. fuel consumption, number of cylinders, weight of engine, weight of piston, rpm etc.
Enjoy!
#saVRee_Nuggets, #saVRee

[@savree-3d]

Want to continue learning about engineering with videos like this one? Then visit: courses.savree.com/ Want to teach/instruct with the 3D models shown in this video? Then visit: savree.com/en ****************************************************************** IMPORTANT The exhaust gas valve for this engine is hydraulic open and pneumatic close (air cushion). The video states hydraulic and hydraulic, but this is incorrect. We have updated the video to fix this error on saVRee.com, but KZbin does not allow us to update the video here. Apologies for the confusion.

[@russeldemillo2254]

YES

[@TerryClarkAccordioncrazy]

Credit to you for paying attention to accuracy.

[@minercraftal]

So much appreciated...

[@nicholastaylorson]

Delete video and upload corrected video ?

[@GVChannel]

That's correct! Good work!

[@pkking678z]

I understand, yet refuse to accept that the scale of this is so large that there’s ladders in the crank case... amazing

[@michaelmurray7199]

Even if you were to see the real thing in person for yourself?

[@daftbence]

I worked on a cruise ship as a waiter and I managed to get a tour of the engine room. Holy smokes, that ship had 4 16 cylinder engines and they were huuuuge. And the noise is just so primal, like the beating of the drums even through mandatory earplugs. Gotta say marine engines are freakin cool

[@calebchampion7781]

But it is sooooo small

[@Andrew-ep4kw]

I loved how saVRee mentioned the coolness factor as a bonus for crawling around in an oil-soaked engine crankcase. Only an engineer would say that. (As an engineering-minded person, I agree, it would be really cool)

[@ralphknowles1843]

I can assure you that having been at sea for fourteen years on 'motor' ships with slow speed engines, that ladders were indeed part of the crankcase furniture. We used scaffold planks between each side of the crankcase sides supported on opposing ladder rungs to form working platforms for working on X/head bearings or even doing a 'hammer' test on all of the internal fastenings. The crank pins and main bearing pins were 1000mm diameter, the cylinder bores were 900mm and there were some engines with a bore over 1 metre. It was all big stuff. Try changing out a piston weighing over three tonnes, whilst stopped on passage from Capetown to Rio. Swinging!! Everyone including the ships cat hanging on to tag lines whilst trying to prevent the square foot on the piston rod crashing into the bore of the liner. Go to 'verk' on a 'Gotaverken'! NOT EASY! Wages low. They got their pound of flesh!

[@stanb1543]

This video deserves an award for both its animation and its clarity. Well done!

[@savree-3d]

Damn it, that would be much appreciated! :-)

[@markdavis2475]

Yep agree, clear narration, no annoying music!

[@scottunique]

100 agree with this comment. I learned more about the subtleties of Marin motor operation and the function of two-stroke motors than I ever thought possible in a single session. Fantastic descriptions and familiar word choices throughout which made it accessible to a humble layman like me. Hats off!

[@user-gl7lp3ty3n]

author is wrong . 8 cylinder engines not 6

[@user-gl7lp3ty3n]

@E Van on vessel in this video engines 8 cylinder not 6.

[@StewartMarkley]

As a submarine sailor from the 70s, I spent a lot of time in the engine room of the submarine around the nuclear reactor, steam generator, condenser, turbines, and bull reduction gear and fascinated by the sheer size of the components to power the submarine through the water. Our diesel engine was strictly for backup propulsion and was TINY compared to this monster. The 115,000 bhp of this beast makes the 20,000 bhp or so power from the turbines and reactor seem rather quaint by comparison. I never thought of using the term engine room to describe an engine with enough internal room so big that you could literally walk around INSIDE. Thanks for a great job on this video. Well done.

[@danielwalker1991]

Hey there my fellow US Navy Veteran... You Dolphins aka "Bubble Heads" are a special breed no doubt.. I was Flying Navy during the Vietnam War and guess what.. life on the flight deck was more than a bit pl dangerous as you may know.

[@RailsofForney]

Thanks, grandpa! (No offense I just think it’s funny)

[@peterjansen7854]

Sailed on usa Guppy sub on loan to europe country 4x1600hp 😅😄

[@albertoswald8461]

Was the diesel a Fairbanks-Morse?

[@blueherc]

I lived through a crankcase explosion! The year was 1972. The general cargo ship loaded building materials at Oxelosund (Sweden) for Bangladesh. The Suez canal was closed so we headed south by the west coast of Africa. Somewhere north of Capetown and with no dry land in sight, the #5 cylinder got hot and one of the bearings ignited the oil droplets in the crankcase. The engine was a Gotaverken G-6 six cylinder. We were adrift for a week! The company that owned the ship, a Greek company, said they didn't want to pay for an open sea tug and that we first must try to resolve the problem ourselves. We worked day and night to replace the piston and we were able to restart the engine and we reached Capetown where proper repairs took place. Note: The exhaust valves were not hydraulic but conventional with push rods, rocker arms and springs and manually lubricated by the Oilers. It was my last ship and end of career. This video is very nice, clear and easily understandable by people not familiar with big marine engines. Thanks much.

[@HealthSupercharger]

Don't these big ships have 2 engines? Wow there should be a backup engine.

[@chrish5791]

Detroit Diesel, which powered many heavy duty trucks and marine use diesel were 2 stroke diesels for decades. They were very effective at turning diesel fuel into heat, noise, and vibration.

[@deksea]

......and work.....

[@62chevrolet]

And oil leaks

[@sillyoldbastard3280]

Yeap. but what a wonderful noise that puts a smile on the dial ; )

[@BobJones20001]

I'll never forget my first chance to drive a Jimmy. Loved that noise

[@ChiefCabioch]

GM Electromotive division (EMD) builds locomotive engines that are used in very large Tug boats, some with 3 to 4 engines

[@ibrahimazaldeen7367]

So professionally explaind !! It is not boring at all eventhough it was 30 min video. I enjoyed every second thank you and keep it up

[@savree-3d]

You are welcome Ibrahim. Thanks for watching.

[@brunofelipe2]

WTF, this video is 30 min? didn't even noticed... wth

[@fazlymolding]

agreed! thanx saVree

[@scottsmith4315]

I was an automotive technician for 22 years but these giant engines impress me to no end. I had no idea how you open and close the valves, and the exhaust valve spinners and pressure relief valves are really cool solutions! Thanks for the great video!

[@thesteelrodent1796]

@@rockwellrhodes7703 computers, mate, and a timing wheel that's connected to the crankshaft. They used to have camshafts on the side of the engine, up until fairly recently actually, with large pushrods and massive valve lifters, just like any automotive engine. It's only about 10 years or so since the cam-less engines became a standard offering, but you can still get them with camshafts if you want to. You can also get the cam-less system as an upgrade for most the older engines that have camshafts

[@siggyretburns7523]

Joe: Hey. Did you hear Tom got killed? Charlie: No. What happened? Joe: A screw fell on him.

[@andriesterpstra8796]

Actually, the real function of the crosshead is to absorb a horizontal force component. The pushing force in the connecting-rod (when at an angle) consists of a horizontal and a vertical component. In small engines (no crosshead), the horizontal force is absorbed by the cylinderwall, while the piston is sliding along.. For these engines this force is too large to be absorbed by the cylinder, thus the crosshead is transferring the horizontal force to the crosshead guides. BTW, I'm a former ships engineer.

[@ralgor100]

there's always one who thinks he knows better

[@SoylentGamer]

You said the same thing in American instead of british.

[@jimblake7623]

​@@ralgor100probably because he does?

[@jayhope2806]

sometimes marine engineers, They will act also like a scientist,. Knows everything about science 😂

[@davidelliott5843]

Fast spinning engines put relatively little side force on the piston. Slow turning high torque engines like these huge diesels put huge lateral forces on the con rod top end. A fully lubricated crosshead absorbs those loads.

[@viejoverdez]

as marine engineer with more than 10 years sailing i found your video very instructive and interest

[@CptGiorgis]

As a cadet I came to this channel last year trying to comprehend how the machinery onboard works based on what you explained. And now a full video on a marine engine, with more marine videos to come? Best news ever!

[@savree-3d]

You're welcome!

[@farhanahmed6879]

Exactly life saver

[@2sad4me32]

Same

[@robertwoodliff2536]

@@savree-3d.... How was cylinder lubrication achieved?

[@ralphknowles1843]

@@robertwoodliff2536 The cylinder is lubricated by an injection system that squirts specially formulated, alkaline' oil through 'kwill's which are spaced radially round the liner at a level where they inject at the second top piston ring when the piston is at top dead centre. As the piston drops, then the liner walls are smeered with oil which not only lubricates, but also neutralises the sulphurous, (acidic) products of combustion.

[@brianteal7898]

In my younger days, our family owned a marina on Lake Erie just south of Detroit. During high school and college, I was a marine engine mechanic. I learned about outboard and inboard engines from my dad and older brothers. I would watch the freighters go up and down the Detroit river wondering how those massive engines worked. You did a great job answering many questions I have had for years. You include just the proper terminology to make us novice mechanics understand. The interactive graphics are just great. Keep up the good work. I will keep watching!

[@BandaSemStudio]

I'm a Marine Engineer and I loved that video. Amazing animation and explanation. You nailed it!

[@jlo13800]

Is there a linear roller bearing thing on the cross-head guide ways or or an anti friction sliding bearing?

[@nicholasbrown1948]

Just wanted to save thank you for taking the time to make videos like these with such great depth and display - also liked that you get side tracked into providing details of the details it really adds a nice touch to the teaching of it all haha Have liked and subscribed will be sure to watch through each and every video on the channel on the run up to my written and oral exams later this year! Keep up the great work

[@danielgore886]

Being a diesel mechanic on heavy equipment, I never had the chance to study large shipboard engines. I've known most were two stroke, but never truly how they operate. Thank you for this informative video. I'll never look at a Detroit diesel on a shrimp boat the same! Thank you.

[@TantawanFPSO]

Has to be one of the best videos out there for Young Marine Engineers, It must have taken you forever to master the 3D software to get it so good. Well done.

[@rajeensuriyawansa999]

This guy is not only a professional in marine engineering,also a professional in teaching and demonstration of engineering. THE BEST DEMO VIDEO I EVER i went through. So simple to undertand and very clear and finest animations used. WELDONE SIR.KEEP GOING greetings from SriLanka ආයුබෝවන් !! ඔබට දෙවිපිහිටයි !!!

[@mopesca]

I worked for MAN B&W several years ago, and this video brings some good old memories to mind. One situation i will always remember is how I had to change the piston oilers, down in the sleeve, 1 of 3 was only accesible through the intake manifold, which was very dark and oily - lost both of my safety shoes in there. you should have mentioned, that these engines can turn both directions as needed

[@michaelbuckers]

All direct drive marine engines can run both ways, same is true for 4-stroke ones. They just use dual cam valve timing shafts, left side of dual cam is timed for forward rotation, right is for reverse. To reverse the engine you just scoot over the entire camshaft left or right.

[@gospelman7222]

@@michaelbuckers When the engine is run in reverse, is the fuel injection timing altered to suit, or is it just accepted that for the short period the engine is reversing it will have reduced power and fuel economy ?

[@louprentz8554]

WHAT AN AMAZINGLY GREAT DESCRIPTION VIDEO. EXCELLENT TEACHER.

[@jg7563]

This is a great video, explaining complex stuff in a simplified manner. Very professional, clear, and top quality. Well done!

[@johnlovett8341]

My 1st saVRee video. So much more in here than I expected. Thanks!

[@fredleonard1547]

One of the best videos I have ever seen on how the big deisel engines work. Bloody excellent.

[@savree-3d]

Thank you! I could read comments like that all day long!

[@alexanderdeburdegala4609]

Thanks for all the unit conversations. That's appreciated

[@J_R_BS]

I'm a 2nd officer on merchant vessels, but I love to learn about the "magic" that happens in the engine room.

[@shobud7561]

I could literally watch these videos all day . Please keep them coming.

[@savree-3d]

Will do!

[@deusexaethera]

6:43 - Two-stroke diesel engines aren't turbocharged to increase efficiency, they're turbocharged by necessity. The turbocharger provides the pressure required to refill the combustion chambers with fresh air after each combustion cycle. Remember, a two-stroke diesel engine doesn't have an intake stroke to pull in fresh air, and it doesn't compress the intake air inside the crankcase like a weedwhacker engine does.

[@hunterpetrovich1154]

Incorrect. The 2 stroke Diesel you're describing is a Detroit diesel style engine that requires a BLOWER to run. Not a turbo. This engine draws its own air with the use of a crosshead, which kinda separates the piston from the crankcase.

[@wolf310ii]

@Shawn Elliot: what do you think happens to the air below the piston? The air doesnt care if its compressed in the crankcase or in the zylinder

[@markgambrill]

Yep you are right. Came to the comments to say the same thing. On start up they use blowers to supply the required air. These are then turned off as the turbo takes over.

[@markgambrill]

@@hunterpetrovich1154 The crosshead is there to take the sideways forces.

[@horseblinderson4747]

The cross head is there because the declination angle won't fit up such a small bore with such a long throw. The charger is there because there isn't your typical Suck/bang/blow four cycle. The cycle and how many there is are counted by what the cylinders actually accomplish. The suck and blow are handled by the charger, whatever type it is. And he has a point about the back yard wizzbangs. You only use fuel oil mix because it's charged and breathes through the lower end anyway. You can't use standard wet sump through something it's sucking in through anyway. At that it's where the only moving parts are anyway. Might as well kill two birds one stone.

[@stanthology]

Totally riveting! Clear, concise. I learned a lot. Thank you so much.

[@jasonneugebauer5310]

Amazing video. Awesome run-through of the marine engine. The Detroit diesel engine has a similar "3" stroke design with pressurized air entering the cylinder at the bottom of the stroke and the exhaust exiting the top of the cylinder through exhaust vales. My favorite Detroit engine in the Hobart aviation grund support generator uses a double three lobe helical blower to pressurize the incoming air and produces huge amounts of power. It can run 8-24 hours per day 7 days per week for 20 plus years with no major maintenance. I doubt anyone makes equipment that good nowadays. Thanks again for the great videos!

[@jlo13800]

Just add oil as it burns it!

[@cyberp0et]

The 3D model is so detailed. Great video.

[@No-pm4ss]

Thank you for converting all the units, you’re a true hero :)

[@savree-3d]

No problem 👍

[@savree-3d]

Drives me mad when only one type of units are shown!

[@taunuslunatic404]

@@savree-3d Just use metric and that's it.

[@mattjohnson8476]

Just watched your video with my 9 year old son (and 5 year old also equally impressed!). We are all amazed! Kept us glued to the screen the whole time. Fantastic video! Thank you.

[@savree-3d]

Wow, thank you!

[@timschell5781]

I have always wanted to know more about how these enormous engines worked ever since I have seen one of these engines and was amazed by their truly astonishing size! Thank you for the great information provided!

[@1227air500]

Extremely well done! I learned more from this one video than I had from a week of searching and reading and watching. I know, and appreciate, the tremendous amount of effort that went into producing this video. Thank you very much!

[@savree-3d]

You are welcome

[@frankdoglione1613]

I'm an industrial arts teacher and this searies is the best instruction

[@paulvr3158]

I am a simple yachty diesel guy, I loved learning this, thanks!

[@FranzSarmiento17]

This is so well explained. I'm an Electronics Engineering student and this is pretty mechanical stuff but I truly understood every part clearly. Subscribed.

[@thomasadkins7159]

I was so surprised to learn that two-stroke designs were used at the large end of engine design. Your explanation and also your experiences make for a real treat! The models are just fabulous.

[@partymanau]

2 strokes can be extremely efficient. Look at the big road bike 2 strokes built by Suzuki in the 70s before the greenies killed them off. I have a 750cc triple 2 stroke that has a flatter torque curve than a my Harley and got the same MPG as my 60cube Sporty. Combined with SRIS oil recycle system it actually ran about 150:1 oil fuel mix too. Long live the big 2 stokes.

[@brylozketrzyn]

Well, if you do not have to do separate exhaust/intake/compression steps due to turbocharger taking care of two of these steps when piston is in its low dead center - life is going to be much easier. You have one work pulse per revolution in each cyllinder. That is huge advantage at that scale.

[@bruceparr1678]

I remember working on a Sulzer piston many years ago. As well as piston rings it had bronze or brass wear bands that had to be hammered into dovetail grooves with ball pein hammers. They were then machined on a vertical borer.

[@HelpyHelperton]

Your video on diesel 2 stroke engines came recommended as a learning compliment to what we covered in the classroom. Wonderfully explained and demonstrated with your 3D model. Thank you!

[@someonerandom6137]

Awesome vid! Didn't even notice 27 mins have passed, as a marine engineering student I thoroughly enjoyed this, thank you!

[@farhanahmed6879]

Amazing work.

[@chandermohan453]

You are a wonderful and good teacher.And you got very thorough knowledge on the subject.

[@savree-3d]

Thank you! 😃

[@christopherbrown2479]

Great video, and I especially appreciate the anecdotes you shared about your experience with these engines. Good stuff!!!

[@thomasbishop575]

Got my EOOW Orals soon. Wish I had seen this when I started revising a few weeks ago. Clear, informative and concise. Thank you very much

[@mestahi]

Extremely well made video, it was really interesting to watch the whole video. Well done!

[@stevebell1128]

Interesting video thank you. On very large engines, from visit to B&W in Denmark, the top piston ring is often made to deliberately pass some combustion pressure to the second ring to extend service life too.

[@vincedanao3211]

I'm a fresh graduate from the Philippines thank you so much for explaining how the process of 2 stroke engine works it's hard for me to catch up like because of this pandemic where we are not able to see for ourselves how a 2 stroke engine really works and its important parts and the ups and downs of it i really appreciate it and hoping for more important videos of you for me to catch up and learn from it .

[@raulgil7389]

Fanatically detailed. You took us along inside the engine. Thx for sharing

[@ashrocks8443]

Absolutely amazing!!!

[@jlo13800]

I heard the lube oil gets burnt as fuel which makes sense as it runs on high viscosity bunker oil.

[@kristinaswanson6063]

Wonderful presentation. Nice simple explanation, technically accurate, nice graphics, and best of all exactly the right amount of content, straight to the point with no padding. Well done ;)

[@savree-3d]

Thank you Kristina. The full video course is coming soon.

[@vegashingovender2336]

Thank you for the video, really useful information, appreciate you taking the time to do this

[@johncunningham4820]

VERY Good instructional Video . Back in my Navy days I worked with a Pair of Scott Sulzer A-Frame engines of an Older Design . They had fully Segregated Cylinders and Operated like a Conventional Two-Stroke . " Crankcase " induction in a Region called the Buffer Space . Two rows of Ports in the Liner and No Exhaust Valve . Transfer Ports from Buffer space to Cylinders . Twin Turbo charged . One Turbo per bank of Three . These Engines could run at 302 RPM or as slow as 10 RPM . They were fitted in a Utility Ship . A Destroyer Tender . Floating Workshop and Fueller . Was good for 25 knots . Though things DID get a bit hairy . Normal speed was 20 knots . Twin Screw . Engines could run backwards just as fast but , of course , the Props were NOT good with that .

[@attdaldo]

A nice interesting and educational lecture which even those who are well accustomed with marine engineering practice would appreciate whole hearthedly as I did. 10ks.

[@savree-3d]

Thank you!

[@valentintin2]

Great video and explanation. Animation is awesome. Thanks. My brother has just boarded on a 300 m gas vessel and I was curious about the engines they use.

[@metalextras]

Thank you for sharing your experience!

[@mec6953]

Now a days we use spring/cusion air to close the exhaust valve, and actuator/hydraulic oil to open the exhaust air v/v.

[@savree-3d]

Thanks for that, useful to know. Suppose designs change all the time.

[@metabeta6993]

That's normal

[@tomeubank3625]

Thanks for this astounding video. Two questions: 1. What is a typical firing sequence? 2. What are the typical bearing and piston clearances?

[@oliverbooth2872]

Depends on the manufacture, engine and direction of runnig but you'd expect something like 1, 8, 3, 4,7, 2, 5,6

[@baby-sharkgto4902]

@@oliverbooth2872 that firing order doesn’t fit an 8 cylinder engine, much less a 6 cylinder 🤔

[@oliverbooth2872]

@@baby-sharkgto4902 I mean that's literally copied out the manual of an 8 cylinder engine. I didn't have a 6 cycl to hand

[@vandalsgarage]

My 671 Detroit (inline engine) firing order was 1-5-3-6-2-4, same as on my current diesel pickup, and in fact, on 95% of ALL inline six engines. The "other" firing order for an inline six is 1-4-2-6-3-5, but its rarely used. I did work on a Toyota land cruiser diesel that used it, I cannot recall any other engine off the top of my head.

[@jmannUSMC]

This answered every question I had about marine diesel engines and a few more I didn't even thing of. Cheers!

[@raydonavan3814]

Great video. Thanks for taking the time to post these

[@nothingiamjustsomekindofdu5744]

8:18 give a turbocharger filter a hug? sounds so nice

[@savree-3d]

You have to show machinery love. The more TLC you give them, the better they work. Works for house plants as well.

[@brucepickess8097]

@@savree-3d Also works on human beings.

[@morkovija]

Stamp of high quality content here. Thank you

[@savree-3d]

Very welcome

[@MrPtittomtom]

It’s the first that a see a so detailed video. Even the PRV’s are explain ! Well done.

[@simonaslygnugaris6921]

I agree with other commentators! What a video! So clearly explained. I found this extremely useful as someone who is only getting into marine engineering. Massive thanks to you! I can tell that you are passionate about what you do! Good luck to you and blessings from Lithuania!

[@minercraftal]

Thank you so much... and now I know where those giant engines are used on now😂

[@beaterbikechannel2538]

You got lucky in your line of work, I'd love that job. I missed the boat (pun intended) when I was younger and went into welding.

[@sillyoldbastard3280]

My bachelor degree was in Mech Eng but as there was very little work in Oz for professionals in that space I ended up in IT/Telco. Having said that I'd much rather be under the car than fixing my bloody computer.

[@guttsu]

Fantastic video, even in such a short time I learned quite a bit. Engines are already fascinating on their own, but when they get scaled up to the point where you can walk inside the crankcase, it just gets that much crazier.

[@obrienmb]

Brilliantly clear explanation of the magic that happens in a combustion engine. Thanks for the awesome work!

[@tzikis.]

Excellent video! One thing you didn't touch on, is how the piston rings are lubricated, since there are no visible oil galleries. And how come whatever oil is picked up by the rings doesn't overflow at the intake ports. I also noticed there's no oil ring, all 5 (!?) rings seem to be sealing rings.

[@haftorsigurdsson4407]

Great question! The piston rings are lubricated through the cylinder wall. Oil is pumped in in small quantities, at (usually) 8 positions, at a timing just before the piston rings pass the lubrication valves on its way up in the compression stroke. The piston rings pick up this oil and spread it evenly on the cylinder wall, and on the rings. The trick is to lubricate just enough to lubricate and protect the cylinder walls and piston rings, but not too much (since it is expensive). The oil is consumed by the engine. Apart from lubricating, another purpose of the oil is to protect the cylinder wall from corrosion (cold corrosion) by using additives. The sulphur in the fuel can mix with water from the combustion to form sulphuric acid. This acid can then condense on the cylinder if it is too cold (hence cold corrosion). There is no need for oil rings since the wall is not "flooded" as in 4 stroke engines. The engine controls itself the amount of lubricating oil which is based on how many kW it is producing, the engineer can off course increase or decrease the amount. One minor detail that was wrong in the video is that the valve first closes when the piston is around half way up the cylinder.

[@sailorlifeisbeautiful6180]

Good video .I'm a marine engineering cadet .please make videos about ship machineries

[@savree-3d]

We are making a marine engineering video course. More videos are planned.

[@sandman0123]

Interesting - thank you! I came here to understand a bit more about 2-stroke diesel engines. It's so clearly explained that it's easy to follow. Excellent graphics/animation!

[@joelmcallister9248]

Well done. Thank you for the work and posting.

[@mec6953]

Thanks, after long awaiting a "marine" related video! pls, I am requesting you to do more videos about marine engineering, very little people care about marine engineering students 😫

[@savree-3d]

Nothing has changed since I was a cadet then! 😃 More marine engineering videos planned.

[@williamcooper9753]

@@savree-3d if your planning more and want to make it relevant to the new engineer’s experience, do purifiers. If a new engineer can breakdown, clean and reassemble a purifiers he will be of real value to the Chief. It’s a hot nasty job but it’s critical and needs some expertise to do right. Also, a few trips in the purifier room will teach the young Engineer to find a nice clean shore job.

[@b.snoodleman5864]

The animation shows both propellers spinning in the same direction when in fact they never due. one spins one way and the other spins in the opposite direction for balance

[@thomasvennekens4137]

yeah and one is thrusting forward the other backwards :D

[@gregorypowell8297]

Thomas: NOooo! The props have opposite pitches! So the thrust would be in the same direction despite opposite rotation!!

[@b.snoodleman5864]

@@gregorypowell8297 THAT IS CORRECT

[@gregorypowell8297]

@@b.snoodleman5864 Thank you!

[@brucepickess8097]

@@gregorypowell8297 I think you missed the point of Thomas Vennekens comment, I believe it was a joke.🤣🤣🤣🤣

[@PhiLoSoPheR_NonSenSe]

Absolute clarity. I'm understanding the processes and mechanics behind the operations of the marine engine. Going by the scales of measurement, the marine engine is... AN EDIFICE!! 😄😁😆🤣😂. The pioneers of this invention have blessed the days ahead (from their era) with their thoughtfulness, ingenuity, selflessness and all their best but unmentioned qualities. They have our utmost gratitude and this similarly goes to those whose resources were spent in bringing us viewers with this knowledge. Thanks so much for: 1) opening our eyes on the marvels of machines and engineering and 2) making my day.

[@kevinjalfonsov]

I've never understood such a complex process that easy!!you do have such a top level of clarity and ability to explain this really complex machine to make a person not familiarized with the topic! Huge effort and impressive skills both in the explanation and model, outstanding job!❤🎉

[@savree-3d]

Comments and feedback are welcome!

[@12345678uygfcxdrtghn]

amazing video, more topics on marine engineering would be welcomed, like purifiers (maybe a comparison between alfalaval, westfalia and mitsubishi) and compressors (tanabe, sparre etc...)

[@williamcooper9753]

When I sailed container ships I once took the fuel economy of the ship and applied it to all the containers we carried. What stood out to me is that a ship is not the cheapest form of transportation because of miles per gallon per container, which was efficient, but because we were moving thousands of containers with just 21 people vs thousands of truck drivers. A little on the economics of shipping might be of interest. Fuel cost vs labor cost , cost of stopping to unload cargo...

[@steelersfan1811]

They should have just put an LS in it.

[@azuritet3]

I wonder how big you'd need to make your hot rod to fit this engine in it. What about that thing they used to drag the Space Shuttle around? They're not using it anymore, and you could just plonk this thing down on top of it.

[@steelersfan1811]

@@azuritet3 I'd personally love to see that happen.

[@azuritet3]

@@steelersfan1811 And they have less than 5k miles on them, so you know they're mint.

[@Toto-os7lc]

Thats a really cool video. You say its just an introduction ... I can't wait to see whats comming next ! Thank you for your time and passion !!!

[@orchidhouse297]

This has answered a lot of questions I had about two stroke marine engines. I had wondered, for example, where the cam shaft was. Now I know. Also how the valves were rotated on the seat to even wear. A big than kyou for such a detailed look inside the engine.

[@gordonloessl2822]

Am I the only one going to ask, what exactly are "monkey nuts" and why would you throw anything into a turbo?

[@trevormtb9372]

My guess would be walnut shells, they're commonly used similarly to sandblasting but are less abrasive

[@viejoverdez]

they are call nutshell, you put them with compress air inside, and they clean turbine side, they are soft enoght no to damage the blade but hard enough to remove rest of fuel stuck in the blades

[@gordonloessl2822]

Still, I was taught never to.throw anything into a turbo. Don't you have 2 engines on a ship.2. Clean 1 when it's not running ❓

[@viejoverdez]

@@gordonloessl2822 normally in cargo ship you have only one engine for the propulsion , of course every certain running hour you have to open the turbocharger for inspection and there you manually clean it about the nutshell is legal comes in the manafacturer manual of some engine , some generator you do it with water but you have to put the engine to run iddle

[@gordonloessl2822]

OK. At least it's explained

[@hansgunther6522]

0:42 Propeller on the right side is spinning backwards, don't think that will increase efficiency 😂

[@johnbattista9519]

Turning ship to the starboard.

[@--Valek--]

@@johnbattista9519 with the rudders strait ahead?

[@Herkimer_Snerd]

It won't reduce it. Spinning the blades in opposite directions cancels out any torque forces.

[@JoshuaPlays99]

That's by design, they spin in opposite directions to cancel out rotational forces of the engine and propeller shaft

[@hansgunther6522]

@@JoshuaPlays99 I know. And he used the correct propellers, one for clockwise, one for counter-clockwise rotation. But if you watch closer, you will see they spin in the same direction. Thus, the propeller on the right side is decelerating... (Or turning the ship, as @John Battista said)

[@garryagent5180]

Absolutely outstanding presentation , thanks for putting it together.

[@sharathpramod6082]

27 mins of pure information......can you please make videos on auxiliary equipment like purifer, various pumps, incinerator,etc.....keep up the good work

[@savree-3d]

Already uploaded loads of pump and valve videos. Purifier video should be next hopefully.

[@mark_osborne]

37 gallons a minute (roughly) for anyone who is trying to put this into perspective

[@nathanhamers9160]

So about the same fuel economy as a Mustang

[@carl8790]

At full cruising speed or at idle? Anyway, that quite efficient considering that the bloody thing weighs 200,000 tons when it's fully loaded.

[@mark_osborne]

@@carl8790 at cruise

[@davidmattice2613]

You forgot the Detroit 2 stroke diesel, which made a bunch of different sized engines. And some were big enough to drive a train, and small enough to drive a pickup

[@288gto7]

The japanese also made a 2 stroke diesel v10 engine that was twin charged. Mitsubushi 10 zf mod 21

[@geoffmooregm]

Detroit 2 Strokes were and still are incredibly versatile. The same principal of operation was used on a 1 cylinder to a 24 cylinder. Each lineup (53, 71, 92, 149 etc) was optimized for interchangeability. Front, Back, Left or Right really didn't matter you could configure the engine to do almost anything. On day I want to put an 8V53 or 6V71 in an old short wheel base cabover and make it a 4X4 with a 10 or 12 speed manual. Well that or maybe I will win the lottery and import a Tatra 😁

[@RokKrulec]

Great video. Goes through a year of my Marine Engines subject in high school in minutes!!!

[@StarlightSocialist]

Thank you for such a detailed walkthrough of a beautiful piece of machinery!

[@savree-3d]

Glad you enjoyed it!

[@mikeemery2484]

Any two stroke diesel MUST have super or turbocharging or both in order for scavenging to take place.

[@panosgamithis8868]

That explanation was "BRILLIANT".... I always wondered how these "BIG" Ship engines worked...

[@ciCCapROSTi]

I really love this, because your oral presentation is less than well practice, but the animation and actual content is exemplary, which just shows that you are not a showman, you probably know what you are talking about. Expert stuff.

[@TheReubenShow]

Thanks for this video. As someone who watches KZbin all day, seeing this was probably more productive than whatever I should be doing right now.

[@hassandhimbil9523]

I did mechanical engineering course long time ago, we did not cover marine engine deeply, I have learnt something today particularly two stroke engine in marine engines, I really appreciate it and many thanks to online tutor.

[@CaptainDangeax]

Thank you for the explanation and all the differences between a marine 2 stroke and a lawnmover 2 stroke. So different !

[@kokwingwang1824]

Very good and clear tutorial. Good vid, good narration. THANKS!

[@janlissens8780]

This is exactly the kind of video I needed. I have to update technical manuals for marine engines and this is the perfect introduction of how they work

[@Bighamps]

I was spellbound by this video. Excellent stuff.

[@johnburke5384]

A truly excellent video...thank you !

[@karolisgudziunas9738]

Brilliant video! Thank you!

[@billg125]

VERY WELL EXPLAINED - THANKYOU.

[@jamiesnits]

My dawg, all i knew was suck squeeze bang blow. This was game changing. Thank you for making it digestable, fascinating (like the facts and scales brought it home) and enjoyable. hats off lad!