Home-made 2 cylinder 4 stroke engine. Part 3 - Pistons

In this part I machine the pistons. They are 34mm diameter and will hold two rings. The gudgeon pin will be a 12mm pin.
I will use the mini lathe and the cnc router. I do not have the correct end mills for aluminum and took a chance with a HSS one.
The second piston failed as the super glue came off. I will remake the second piston soon and will be ready by the next video

[@gwheyduke]

Very nice looking pistons.

[@wrenchwms2635]

First off I admire your ambition... And remember that we learn more from our failures than our succeses.... But... A few things to consider #1 Most pistons are not round they are just a bit oval to compensate for the extra thermal expansion around the wrist pin. #2 The outer walls of most pistons are not straight they have a slight tapper for the thermal expansion of the crown. #3 The wrist pin not centered in the piston, it is slightly off set to prevent piston slap. #4 Most 4 stroke pistons have 3 rings compression ring, scrapper ring and oil control ring what you made looks more like a 2 stroke piston. #5 Engraving the top isn't a good idea but it dose look cool until you hole the crown. #6 I'm not so sure about your work holding technique. All that said fun video.

[@pbysome]

He'll get away with running it in gently but he won't get away with the scrapper ring, it'll smoke like fook.

[@najaciuser5445]

4 , 5 , wrong

[@singaporeseaslugs1393]

@@najaciuser5445 explain 5?

[@VATSYAYAN-]

Superb machining Precise job. Thanking you I have liked this

[@NicosProjects]

Wow - great Job!!!

[@user-nb9ef9fh9y]

great job👍👍

[@muhammadhafeez7441]

Great work

[@casperl6812]

Offerings to the god of speed

[@user-ej5jh7kc4k]

I was not expecting 34mm pistons, I wonder how it will be powerful Anyways keep up the good work :)

[@TheXSpitfire]

It will be 25cc per cylinder. It's a bit bigger than I wanted, but the tolerance are easier to hit. Once I know what I'm going I'm going for a micro version.

[@clivelee4279]

Evening,what grade of aluminium are you using ie,is it a low expansion type.If it is, what's it known as please? and where is it obtainable, thanks.

[@RAINSKEE]

Wow I really like the video

[@tonytee.1864]

Is there a reason for not having a normal piston skirt to prevent piston rocking and piston slap?

[@iiabdus69]

Amaziiing

[@jesusariza2120]

Como haces para el modelo 3D salgo como lo hace al inicio del vídeo?

[@Aeromaniacos1987]

Hello friend! What aluminum alloy was used to manufacture the piston? ?

[@jean64212]

wow amazing

[@ashlaw8539]

What kind of blade to cut out a piston ring root

[@phamthehung1535]

ông giỏi nhờ , không tính giãn nở nhiệt khi hoạt động à

[@anggaprow6826]

Mantap mas👍

[@ryebis]

you should do a video on the piston animation, it was awesome!

[@eugeneivashko]

Hi, nice work. What lathe do you use?

[@tjoshaugh]

Just a thought... If you engrave designs on the top of the piston, doesn't that give carbon a place to build up more?

[@TheXSpitfire]

I will be happy if there is carbon build up... It would mean the engine runs! ;p

[@tejdz1337]

sharp edges also promote detonation

[@junioju2854]

Pesa linda ben trabalhada 👏👏👏👏

[@nicholasdautel1228]

What type of material are you using??

[@luqmanhakim-kmnkspeed]

What, s tipe alumunium 7075 or ect??

[@louisvanrijn3964]

Which alloy was used? Which temper?

[@CMBProjects]

Great work! Hope it will work well

[@user-mh2no3hj2t]

Ох и чистота после фрезеровки) Что то он размер отверстия под палец не стал показывать :D

[@user-hm3wf9ec9d]

عمل ممتاز واصل .

[@nurmogati6414]

You have Everything... May be I m dreaming... But I like to do it... Please imagen that you live with me... Can you creat engine as like as mine... "New Rotary Engine...??? 😭😭😭" Meanwhile you have a dream like me... 100%..... What should you do is 😭😭😭😭😭😭 But... Bravo... Friend from Indonesia... 😍😍😍😍😍

[@Dymitr_Nawrocki]

What type of valvetrain will it be? What rpm of the engine are you aiming at? If you want to make it fuel injected check out Speeduino, it is engine management project that use arduino board as engine ECU, about a year ago i used arduino board as ECU in old soviet Minsk 125 two stroke motorcycle but i sold it and can't find program i wrote, anyway if you want some help with it just ask.

[@TheXSpitfire]

I have a single overhead cam planned so far. When I get to casting the head I will have to see if it will work or if I will have to re-think the head. As for RPM, I am not expecting anything high as the crank is still not designed as yet. I will have to make the crank in separate pieces to get the bearings on. The balancing of the crank will also be a hurdle to overcome. Thanks for the Speeduino tip ! I will have a look at it. I am hoping to do the block casting next week.

[@watahyahknow]

thanks for the link

[@tdsangel]

how do you secure the 12mm pins? i think the gaps for the clips are missing.

[@TheXSpitfire]

The pins have grooves for a E-clip. I am not sure if it will work, but holding thumbs

[@tdsangel]

@@TheXSpitfire please don't do this. you weaken the pin and the clip tends to come lost. the damage will be severe.

[@weldmachine]

I am curious. Will you actually run this piston in a motor ? Or is it just for the sake of making a piston because you can. No doubt you have done a great job of making this part considering you are using fairly basic equipment to do it with.

[@TheXSpitfire]

Hey. I am going to try an run it for sure. Plan is 2 cylinder and fuel injection. I am going to be shooting the next video the weekend. Thanks for watching. Appreciate it.

[@ShajaKarim]

Make a 4 Cylinder Two Stroke, This One Was Amazing

[@vipelimps3906]

Which metal r u using

[@alessandroandrenacci2372]

Minute 8:28 - please, could you teach me how fold the instrument leg; i got one now but i never seen it used with such a position, with its sensitive leg folded up to 90° . . .

[@TheXSpitfire]

You should be able to slowly pull on the indicator leg until it reaches the angle you want it to be at.

[@alessandroandrenacci2372]

@@TheXSpitfire thank you very much for your fast and kind answer, but on my micrometer the leg seems firmly fixed ( except for a little angle movement in both directions, for reading purposes ). Pulling has no any effect. I'll try again, thank you in any case. Alessandro from Italy.

[@bekiruzumcu1797]

Hello.perfect workmanship.bravo.you a subscription from Turkey.I have a 0.50 inccup model plane engine, but I scratch the piston. I want to do it again?thank you

[@MarceloPereira-ll4go]

Ficou lindo parabéns

[@arielfernando3916]

Instablaster.

[@kaleufarias7705]

The lathe is a Manrod MR-300 series right?

[@TheXSpitfire]

It looks exactly like it. Just custom stickers of our local distributor. This one came with metal gears and a live centre.

[@borderm3]

How is he keeping the work concentric each time he flips it and rechucks it?

[@TheXSpitfire]

I needed a hole in the back of the of the stock where the cnc router could enter to hollow the piston out. Luckily that hole is not dimensionally critical. The router can machine aluminum but it's pretty slow going and the predrilled holed saved some time.

[@sumanmondalsuman7635]

Good sir

[@nishithpshetty]

can u give me the plans of this engine plsssss.

[@motortua1652]

Nicee...

[@Creativ_DIY]

Gunane nggo ngapa jajal nek di pasang nang motor li ora bisa mbokan ?

[@andrejmalik5596]

yay

[@suryadicecep94]

Best moment

[@dinhnguyen77]

Quá hay quá chi tiết khi sản xuất một trái piton

[@Vazzr]

Engravings on the top of the piston will cause detonation and pre-ignition, but otherwise great job !

[@nathanzalika160]

Mantap

[@ThoBar93]

This is going to be a really nice engine impressive work I always wanted to machine an engine where did you got the drawings? Could you send them to me?

[@iqinsanity]

If you needed 72mm pistons (I do) would you make them from scratch or turn down 73.5mm pistons. Diesel application, idi to di conversion

[@chrismechanic2000]

turning them down would be much more practical but the skirt would be weaker.

[@iqinsanity]

It’s a yanmar 72mm engine. I could probably use a “standard” over bore. So turn the 73.5 down less than the full 1.5mm

[@iqinsanity]

It’s a sleeved engine, the sleeves aren’t thick enough and I won’t run it unsleeved. That would turn it into a throw away block if it even survives a week.

[@iqinsanity]

It’s iron, but I don’t feel the solution is to modify the block making rebuilding impossible when you can modify the pistons and rebuild forever.

[@92gashaulass43]

@@bacilluscereus1299 its diesel engine,not a gasoline,sleeve are best opt

[@luqmanhakim-kmnkspeed]

What is dural alumunium tipe.??

[@hibahprice6887]

Duralumin, is a collective designation of a group of high-strength alloys based on aluminum (aluminum alloy) with additions of copper, magnesium and manganese. The name of the alloy comes from the Dural trademark (fr. Dur - hard) - the commercial designation of one of the first aluminum alloys hardened by heat treatment and subsequent aging. The main alloying elements in it were copper (4.5% of the mass), magnesium (1.5%) and manganese (0.5%); the rest is aluminum (93.5%). In tensile tests, the typical value of the yield point of duralumin is about 250 MPa, the short-term strength limit is 400 ... 500 MPa, however, the strength characteristics of a particular alloy depend on its composition and, in particular, on heat treatment.

[@user-sl6yh4mn5e]

Блестящая игрушка. Созданная чисто для рекламы.

[@Melnikov_Yuriy]

Супер :)

[@rezaljohari4646]

Not use pin?

[@manishpoudel4540]

i was so eager to watch your video and big fan of your work ! you have 34 mm piston now if you make 50 mm cylinder height then the cc will be nearly be 50 cc then when you use 2 cylinder then about 100 cc engine you'v got wau and what compression ratio are you planing ? and if possible then a glow plug hole can also be added and off course a hole for spark plug , or are you planing to make only nitro ? but it would be a lot cool if it could take both nitro and petrol as fuel awesome project! post next video as fast and nice as possible.

[@manishpoudel4540]

are you replying?🥺

[@TheXSpitfire]

The stroke will be 30mm and the bore 34mm, it works out to about 55cc total. The plan is to run it on petrol (holding thumbs).... There is a little bit of play room in the compression ratio, but I am aiming to get 9.5:1, that way it is in the middle of safe. It can be lowered or raised by making new pistons. If all goes to plan, it should have a ignition system and single fuel injector controlled by a micro controller like an arduino. I am imagining playing around with the timing and seeing what effect it has on the power. That I dont think you can do with nitro. Thanks for the comment ! See you soon Manish.

[@manishpoudel4540]

@@TheXSpitfire wau nice plan aren't you using carburetor ? fuel injection is better than carburetor? oh oh but a hole for glow plug would be fine and not that big deal in putting a hole when not needed you can cover it with a glow plug with no coil. thanks a lot for your reply!

[@TheXSpitfire]

@@manishpoudel4540 I am not ready to build a working carburetor yet, I simply do not have the skills yet. The fuel injector is relatively simple as its only a petrol pump, regulator and the injector. The advantage is that it will be easy to play around with the fueling using the injector. It would also make it possible to have more than one "map" for the fueling. When it comes to the ignition system and fuel injector I will show my thoughts in more detail.

[@manishpoudel4540]

@@TheXSpitfire oh ok thanks a lot !

[@motorage8283]

which country are you sir?

[@pabitrikalita3940]

bro how did you get an oval shape, i had also tried it but its just impossible to get an oval shape

[@evilempire7066]

Ежик прелесть!

[@gowipeyourass1641]

I didn't knew that all home should have lathe machine

[@mattwilliams4919]

Gowipe Yourass maybe all home should have English tutor also

[@dot3825]

Where is pin locks cuts?

[@cyperherz4518]

mist people: i wonder how pistona are made this guy: hold my camera

[@ioancurca7401]

Ca sa faci asemenea piese fine, trebuie sa lucrezi cu masini unelte miniaturale totul se rezuma de ordinul sutimilor de mm strunjit ,frezat si in primul rind desen tehnic

[@RAINSKEE]

Please I want to learn it

[@rinaldolopes9648]

Mas isso não é um pistão de quatro tempos. Ficou faltando a canaleta do anel de oleo. Portando é um dois tempos

[@hexadane]

Ek gebruik gewoonlik 'n 70/30% mengsel van parafien(70%) gewone 10w40 (30%) vir sny olie op aluminium. Dit werk goed.

[@TheXSpitfire]

Ek sal dit probeer. Die router loop maar hoë rpm wat maak dat ek net 6mm of minder bits kan gebruik. Ek wil kyk vir mill en dan sal ek jou raad probeer.

[@skorbeunblak3616]

Good😘😘

[@disilberg9896]

Класс👍👍👍

[@matysgauthier6742]

Test plz

[@thongly5962]

26/5000 What is the brand of CNC machine?

[@TheXSpitfire]

It is a ChinaCNCZone.

[@user-vs7dr9tm6d]

ماشاء الله

[@emanuelperez3090]

Creo que te sirve más comprar un pistón que hacerlo. Con el laburo que da hacerlo tenes que cobrarlo presio oro

[@dean825]

Should used paraffin on aluminium..... Get a lovely finish

[@kmikaz2.029]

16000tr.min are to much just listen ..but Nice work and acetone are better for alluminium cnc works

[@shareefshaikimam9702]

👍

[@danny0885]

der igel ist sūss

[@mjt-ew8rs]

you do know that pistons are taped, yes? meaning the skirt has a larger diameter than the top of the piston.

[@TheXSpitfire]

I decided not to taper the pistons. There is enough play so they can expand, but also enough compression. The motor should start and run a bit.

[@TheXSpitfire]

@Mescalinum Sunshine I am not too worried about efficiency. The gudgeon pins will be from Aluminum too, so the piston should expand more even. The tolerances are at the bigger side of the scale. I had to stop working on the project while things were under lockdown. I will continue next week.

[@watahyahknow]

wonde how he got the ovality in the piston (to counter for the deforming at full revs and the difference in expansion at the gudionpin ) the piston needs to be slightly tapered too as the top will expand more then the skirt impressive though , might try it myself when i build a overbored smart fortwo engine

[@mikelowe3754]

Common way to oval and taper pistons is to jack the gudgeon boss apart from inside, machine your desired taper then remove the jack. The boss area will spring back to proving ovalaity. It actually works quite well on suitable alloy for pistons.

[@watahyahknow]

@@mikelowe3754 wat type of aloy do you use for the billets i need to make pistons with a 67.5 diameter (been looking at yamaha motorcycle pistons , these seem to fit the bore size though im not quite sure about the placement and size of the wristpin ) going to look intoo ready made sleeves too for a 79 mm stroke hard to search for sumting without a detailed crossrefference list for pistons , wonder if theres sumting out there , in the old days they had the hollander cross reference manuals to see wat carparts fits one wat cars lot of the parts cross over between the car brands

[@TheXSpitfire]

@@watahyahknow I did not machine any taper into the pistons. I was hoping by keeping the tolerances big enough, it will not be necessary have a taper. Hopefully there will be enough compression too. The project is just to learn some lathe skills and if the motor ends up starting...bonus.

[@watahyahknow]

@@TheXSpitfire youre doing pretty good , one thing though , lathes are not as precice as you think every time you take the part out and put it back in the chuck it will be offset oh so slightly , try to do all the machining with the part chucked in the same way or work between centers (this alowes you to take out and reinsert the part multiple times) if the expansion turns out to be too mush you can allways put a split in the piston skirt , constructionmanuals.tpub.com/14264/css/Figure-3-25-Controlling-piston-expansion-77.htm good machinist here is abom97 he has some pretty huge machines though and stephan gotteswinter kzbin.info this guy is a toolmaker and verry exact , he uses mostly chineese tools in his shop though but made better by him through scraping and measuring , i learned a lot from watching him

[@mikelowe3754]

@@watahyahknow I have made them from T6 free machining extruded bar. Thats the most common off the shelf stuff and cheap. I have made them for fun, not performance. What are you building?

[@haugaming4691]

54mm

[@MarceloPereira-ll4go]

Como chama esta máquina aí

[@redwasprider4442]

Torno Mecanico

[@oldschool_engineer]

Как выставочный экспонат можно использовать, как рабочий образец ставлю под сомнение, если он заработает, то двигатель будет малооборотистый и маломощный.

[@hakemhokm4184]

Hello.can you design my idea ?

[@borivojpandurovic3625]

Pistons are conical and elliptical....

[@sukasukachanel9815]

Indonesia

[@stevearehart313]

WD40 works very well on aluminum.

[@cia9315]

Где вы нашли этого Ежик

[@hoangdoanmanh6544]

Việt Nam 🇻🇳

[@dkvlog2084]

chào đồng bào

[@pathank1348]

Yrr ek tamancha bna de

[@nurmogati6414]

Do you...? 😊

[@user-vs7dr9tm6d]

😮ماكنه تفريز والله اعلم

[@leneanderthalien]

only a precision: on REAL pistons is the external diameter NOT CYLINDRICAL: the shape is in form of a barell, with smaller top end (to compensate the higher heat at top),and in addition oval (smaller at pin).With cylindrical pistons did a engine jam if hot...

[@bh5097]

You are correct.

[@jamesdond1]

"Home made, Pistons" yea all you need is a lathe a CNC router and CNC milling machine... and what home does not have those in the garage?

[@TheXSpitfire]

With home-made I imply that it was not bought, but made at home. Its not DIY. Home made meaning : Something that is home-made has been made in someone's home, rather than in a shop or factory

[@tds3339]

Of course some people do have tools. CNC/Milling is a popular hobby. I can make homemade apple pie, even though many people do not own flour.

[@jamesdond1]

TDS, My milling machine cost me 130 k all told my equipment is well over a million dollars. I don't think many homes are so equipped...

[@tds3339]

@@jamesdond1 This video series features a $1000 lathe, and a relatively inexpensive milling machine.

[@chrismechanic2000]

i have a hobby sized mill and lathe in my garden shed, not cnc but i have power feed, i make my own stuff that cannot be bought like gears and drive shafts for rc use.

[@nurmogati6414]

I need no patent of my engine... I dream... 100.000 units driven a year in my country... will mine... 😂😂😂😂😂😭😭😭😭😭😭

[@user-sp3fr3si3y]

🌺🌺🌺👍🏻👍🏻👍🏻👍🏻👍🏻👍🏻👍🏻👍🏻👍🏻👍🏻👍🏻

[@azizrizki1664]

good but real piston have not the same diameter cause the dilatation at the top of the piston

[@MM-lo7ey]

嗨

[@mostwanted33986]

The pistons should not be a 100% rounded and the piston pins shouldn’t be in the center

[@irinkamatrashilova7700]

Ну не более чем приятный сувенир) работать не будет! Не хочу повторяться почему…

[@gondangpacet9954]

Good

[@gondangpacet9954]

Piston apa yang itu

[@MM-lo7ey]

嗨

[@colemanbinyon7063]

hello recommendations

[@samsonimport]

Bad idea , wasted alot. Simply cast piston and machine. Piston material also need to hardend.

[@TheXSpitfire]

Hi Sam. I am not quiet proficient with casting yet. In the future I will try my hand at it. It is also an exercise in learning to use CAD/CAM and CNC machining. I am also wondering how long the pistons will last. I want to try a few hardening coatings in the future.

[@samsonimport]

@@TheXSpitfire automobile manufacture add some silicon in alumunium around 15_20% to make it harder and bear temp. High than normal alumunium.