Diesel Engine combustion -Part2 -Stages of Combustion ,

RMETC Videos
This Video will throw light on DIESEL ENGINE COMBUSTION , Factors affecting Self Ingition Temp ,Stages of Combustion, What is Indicator diagram , Draw Card, VIT , Super VIT , Difference between them, Example of How VIT and SuperVIT are implemented etc. In case you have not seen Part 1 , please do see that before you continue with this video at • Basics of Fuel combust...

[@shubhamkala2881]

Boss, even our lecturers are showing your video clips, that explains itself. Being so senior and expert, still humble, Thank you. Kindly increase your frequency of making videos, just a recommendation.

[@anandsagar9132]

Thank you very much sir.... feelings very lucky after I found teacher like you with such great mind and good soul....Awesome Explanation sir.

[@sjdjhhfb]

Bada sab ....your KZbin video were verymuch useful for my class2 preparation,no matter how much time I study few subject like rudder carrier bearing cannot be understand when surveyer ask question I just used say what ever I memmories off course when he ask cross question I could not answer I belive after watching your video I will be more confident...as I'm start understanding thank you ...love to see lot of video from you bada sab

[@sivalallu]

A comprehensive and in-depth explanation about vit sir. Thank you for the video. I would like to add something. The main difference between VIT and SUPER VIT is that in Super VIT, the breakpoint is adjustable where as in VIT, it is fixed.

[@AmanKumar-ss6dv]

absolutely amazing sir, i am learning a lot thanks to you and your dedicated efforts.

[@christinechongwo3795]

Thank you Chief. Your videos are very helpful, as I prepare for my Class 2. Thank you

[@simransingh1885]

So good sir! Thank you very much. I was eagerly waiting for you to publish the second part

[@jarvissingh1374]

Thankyou sir... Your videos have always been Very helpful...

[@tusharpawar2946]

superrb sir. fantastic knowledge

[@sahilpathania5178]

Sir ,, I really appreciate your knowledge and way of teaching..I am your big fan sir

[@SubanS-zk8oj]

first of all thanks a lot sir, your classes stimulated my engineering skills.

[@sudhiiryetchina4585]

Great work sir, thanks a lot

[@vivekrana4240]

Great work sir 👍🏻

[@dineshram3477]

Brilliant explanation sir 🙏🙏🙏🙏 thank you very much

[@kartiksood4504]

Thankyou sir ...those graphs and why only 85 percent MCR concept have been quite understandable with your videos....

[@sarankumarsaran9383]

Thank you so much sir. Please keep posting videos

[@shubhamtarlogta659]

Keep uploading videos sir ..they are very helpfull..🙏

[@aravinthraj3341]

Very nice sir. I had great confusion with VIT & Super VIT. I was thinking VIT for sulzer engine and Super VIT for MAN B&W engine. even I didn't had clarification on double helix. thank you so much for explaining this sir 🙏

[@vaibhavnayak626]

Excellent explanation..thank you so much sir, please increase frequency of your videos 🙏

[@mohottiarachchi]

Thank you for clear explanation

[@krishnakumarr256]

sir thank you sooo much for this video and the effort you put This video was very excellent like your previous videos' request you to please do a vide on sulzer vit

[@amaranand2871]

I want to add few lines , please do not take it otherwise, there is engineering principle , pmax/ pmean is inversely proportinal to SFOC , also if we see the propulsion engine sfoc curve with percentage load ....sfoc comes low at near 80 percent to 90 percent load as per different engine, thats why we used to run engine at NCR( economical RPM).so we try to get the break point near 85 percent. Another point of not engaging the VIT below 40 percent load is one is manovering RPM is there, continuous engaging the VIT rack leads to wear and tear of parts and another is in marine diesel engine inertia force is directly proportional to rpm square. if we increase the peak max more it will give more load to crosshead bearing ,as gas pressure will increase due to more p max but RPM is less, it will affect crosshead lubrication and we need to manufacture bigger bearings etc.

[@rmetcvideos]

keep up the good work Amar..Actually I dont get enough time to get into the nitty gritty of all these topics . I am busy with content creation and workshop conduction for Hydraulic Failuure Management of Deck Equipments for various companies..Trouble shooting etc... So obviusly I find it difficult to catch up with ALL topics at a decent level...So Please add on your knowledge and point out any gaps in whatever I Make.... I am aware that my stuff is not 100 %...and may be lacking in many places..

[@Ssss-607]

sir firstly thank you so much sir ,kindly please make the videos on fuel pumps also so that we learn much more in details ,knowledge is expanding in nature ,what we learned is very less in fuel pump.

[@rmetcvideos]

Sure I will

[@thakurarpit16]

Thanks a lot sir.... 💕

[@RajeshKumar-mt3pg]

Downloaded video watched super easy made by Ramesh sir. I have a request sir please make a video regarding fuel injectors(2 stroke)working,circulation during standby and test,howw the internal part function at 350bar and 7to8 bar. Thank you sir

[@maheshshanmugham6034]

Firstly, excellent way explaining the topic sir. Regarding the super vit,i read somewhere,if i am right,that breakpoint ( 85% usually) can be varied by governor output signal 4-20mA,which vary the air pressure to the vit index,basis scavenge pressure and fuel quality setting.

[@rmetcvideos]

Super VIT ..can add many parameters including FQS lever etc... VIT is the simplest--prefixed.

[@recommendedsam638]

Excellent, sir can you make video on PID controller nakakita? Please . thankyou

[@sumandas5863]

Explanations are very easy to understand sir...you may opt for publishing a book sir!!!

[@pmageshkumar4314]

Hi sir, your videos are very help full , lot of things i learned. Pls update m.e governor videos, y limiters are there . Automation parts like pid controllers

[@naylinhan5795]

Thanks so much

[@user-rt7wm4mm6e]

Thank you so much sir for such a nice video. Best wishes from Bangladesh.

[@rmetcvideos]

Bangladesh-- geat memories and lovely people. I used to conduct workshops in Dhaka and Chittagong..

[@amaranand2871]

Genearlly to counter ignition delay , we used to do setting of FQS , fuel oil quality setting and ofcourse for doing that we need to have VIT arrangenment.

[@shakilmahmud6179]

Always best

[@amaranand2871]

I have even sailed on modern MAN BW engines ( MC engine) where VIT was not there....so we can see that fitting all arrangements are viable as cost wise as reduction in SFOC is about 2gm/kwhour approx

[@bhuvanayyanar6524]

Thank you sir

[@mohottiarachchi]

Sir please add more videos on power balancing ,assessing engine performance during peak pressure measurig and corrective actions you suggest

[@mathhero6234]

Thanks lots sir

[@Abhaykumar-ix6qw]

Thanks a lot Sir, very helpful video. Please upload more on Fuel Pump type, working.

[@rmetcvideos]

Sure I will

[@prasadjoshi3749]

Sir, kindly requesting to make video on vibration

[@saikrishnakavuri1347]

Do video on fuel pump sir

[@The_Anti_God]

Suction port of jerk pump. How does it open? Where is delivery valve? Path of fuel when puncture valve is operated??

[@ravichandrakulkarni1571]

thank you very much for your efforts sir! please make videos on maintenance of machineries. important checks to be done while overhauling an equipment. please explain earthing system onboard ship.

[@rmetcvideos]

sure..as and when I have time

[@madhavrajuvaisyaraju3451]

One more request sir...how to adjust vit? And it's control mechanism with governor??

[@jarvissingh1374]

Thank you for making this topic look so easy. Sir, I have a doubt, what is the effect of piston speed on rate of compression?. If the rate of compression increases with increase in piston speed then why do we need to advance the timing on increasing load. Increased rate of compression will lead to increased temp. And the fuel should burn at the correct place Without altering the timing.

[@rmetcvideos]

Higher speed means more load... means more amount of fuel needs to burn.So fuels burns away from TDC thereby increasing inefficiency. If you advance it ..we improve this

[@imrozeghalibislam1993]

Very nicely explained sir. Could you please elaborate about FQS and adjustments to FQS in Rta MC engines

[@rmetcvideos]

I think there are many in you tube...My depth is not that much to do justice tio these topics..I am more involved in Hydraulics

[@madhavrajuvaisyaraju3451]

Badasaab....ur explanation of vit is awesome ..it has cleared my many of doubts... One more doubt sir... U said start of fuel injection ll be after plunger covering spill ports?? I studied some where that start of injection ll be after plunger covering the suction port n end of injection opening of spill ports. I request you to clear my doubt... Thank you sir..

[@jaswindersingh2003]

they are not port that are suction and spill valves in sulzer fuel pump whose opening and closing is controlled by push rod which are resting on ecentric rocker arm.VIT is controlled the changing the position of ecentric for suction valve and FQS is controlled by spill valve ecentric postion.

[@amaranand2871]

Great job sir👏

[@suranjanghoshal3390]

Heya! Wanted to confirm in electronic engines, Is the advancing and retarding fuel injection timing already incorporated with electronic injection profile cam as per load in ECU... Or VIT happening is not there... Please answer this

[@rmetcvideos]

Absolutely

[@achintyatrivedi8905]

24:42 sir, how do I find out a little bit more about "old P stick engine" (if I understood the name corrrectly)

[@rmetcvideos]

I got som elittle info from DK Sanyal....there may be more sites..

[@kavyanselvam4181]

😘😘😘😘

[@srinubabu6412]

yes sir its complicated topic... but u made it easy .. thank u sir

[@rashedulislam9397]

Sir just to clear my thought. in super VIT breakpoint is also varied with respect to scavenge pressure. But in VIT it is fixed. Am i right sir??

[@rmetcvideos]

Yes

[@verminer7]

Question, who knows why do we get more output when we start retarding the timing after 85 % load? I cant seem to figure that out

[@tanveer120121]

Sir how to check timing in MAN B&W fuel pump with VIT ?Is it the same way as in fuel pump without VIT?

[@rmetcvideos]

I dont think there is any big change as far as timing is concerned. Timing is about the orientation of cam wrt camshaft and position of spill port at the Firing angle.In VIT the only difference is that advancement happens after say 50 % load.Timing is checked with Engine stopped. So...there shud be no difference

[@ashutoshchaudhary9202]

So sir in vit it's plunger and it's double helix which controls advancement. And in supervit it's barrel which controls the advancement. Am I right?

[@rmetcvideos]

Yes..But many may debate :-)..I concentrate on Concepts and less on Definitions..As long as we understand it is Fine..Ha HA

[@karunmonnappa467]

Sir super big thank u for this video..! I have a tiny doubt sir that just arised, when the load of engine increases does it mean that the rpm of engine has increased or decreased ?

[@manishbhandari4716]

Not exactly. Power = Torque*Angular Velocity So, for same power if torque is low RPM will go higher and vice versa.

[@jaswindersingh2003]

RPM will not change as load increases governor will supply more fuel to maintain constant rpm

[@Thewishfulfoodies]

Sir can u please make a video on how actual adjustments are done for fqs setting and break point setting on the vit console?

[@rmetcvideos]

honestly -- I have not done it..never had the need to...😄

[@abhishekchaudhari8009]

Sir, what is different between ignition lag and ignition delay

[@rmetcvideos]

Same thing...

[@mikhailcho4287]

Sir, can I say the introduction of ME engine making the VIT obsoleted?

[@rmetcvideos]

The concepts are all inside the ECU??

[@pradeepchakravarthi2933]

great explanation ..plz make video complete ref cycle

[@Surendhar2002]

Sir during uncontrolled combustion does piston experiences an brake then how it overcomes and reach TDC

[@rmetcvideos]

Every movement of the piston towards TDC acts like a brake on the shaft.But the Flywheel has enough energy stored up PLUS thanks to the PUSH of the firing piston s--the Piston can overcome the obstacles and reach TDC

[@surendersinghsehrawat9816]

Inertia stored in flywheel and firing push from some other unit do overcome this break. Also small Con rod angle just before TDC make this break very much ineffective.

[@amaranand2871]

another point i think of generator engines having not VIT provided....they r 4 strokes engine...medium speed engines...RPM 720.etc....in 4 tsroke engine compression ratio is more compare to 2 stroke engine...we supply 300 percent air in modern 4 stoke engine compare to 2 stroke engine where we provide 200 percent....higher fuel injection pressure compare to 2 stroke engine...also time for cooling is less as RPM is more....

[@olivertwist6855]

Hi sir, what is the definition for fuel index?,

[@rmetcvideos]

I might not be sure about how the books word it..but it is definitely about the quantity of Fuel being injected.

[@meetsheladiya6114]

I just read it , VIT was introduced by sulzer in 1978.

[@antokattikkaran8650]

Can you make one for anchor hydraulic system

[@rmetcvideos]

thanks.Honestly ..none of the hydraulic videos evoke a good response...Thay seem to be flops --:-)

[@manishbhandari4716]

@@rmetcvideos Sir, hydraulics videos are amazing, have helped to understand shipboard systems. Thank you.

[@muhammadjunayetnoor1126]

Sir this video was very helpful for understanding the role of vit at loads above 40 percent mcr. But nowhere could i find a clear concept as to the reason of vit being inactive below that load. Sir kindly provide me with a clear answer so that i can sleep. You are the best.

[@rmetcvideos]

Ha ha..the answer is very much in the video..I am sure u must have seen it in high speed mode...below 40 % the termination of combustion does not continue beyond 10 degrees.. so minimum. Wastage of heat...If you advance and start the combustion process earlier. The engine may stall bcoz it may not have the momentum to compress burning gas and cross TDC.

[@amaranand2871]

@@rmetcvideos Sir I partially agree with this answer....in propulsion engine power is directly propulsion to rpm cube. lets us assume 100 percent MCR is at 100 RPM. At 40 percent MCR it will come around 70 RPM ....which is not less....

[@AmitKumar-ic6dd]

so many videos i have watched even this video is not doig justice to th e topic VIT- variable injection timing- double helix or by changin the barrel position super vit - variable injection + breakpoint shift by controlling scavange pressure the graph says VIT INDEX not super vit index even after mcr 80 the vit index can be reducked by the barrel shifting method that why they called thr line VIT INDEX not super vit wihhc you said in the video

[@rmetcvideos]

The graph copied from Internet..Have you heard people using the term Super VIT Index..may be they dont..The index I guess is always called VIT..Super VIT being the ABILITY to vary the index basis influence of multiple parameters like. Scav Pressure,Fuel Quality, etc apart from Engine Load. Anyway..Getting into definitions is not an area of interest to me 😄

[@ramansehra]

Thank you very much sir for the topic., Surveyor asked me why break point cannot be set beyond 85%, But I was blank, Then one of my fellow told me due to mechanical lever limitation break point cannot going beyond 85%. Is that true sir?

[@jaswindersingh2003]

to limit pmax

[@jaswindersingh2003]

your fellower was right but he is explaining in term of vit construction(mechanical vit) the location of pivot point restraining the movement of linkage controling pressing of pressure regulating valve in vit

[@immanuvelgonsalves2438]

thankyou sir

[@The_Anti_God]

Suction port of jerk pump. How does it open? Where is delivery valve? Path of fuel when puncture valve is operated??