not many people know , change the cylinder head compression solid

[@NewHampshireJack]

If you have a good supply of old cylinder heads from cheap motorcycles to practice with. why not give it a go. You lose very little if it fails but gain a lot if you succeed. This guy has skills beyond the average shade tree mechinic.

[@jbstepchild]

That was a beautiful finish hats off to you good folks

[@randylangston2562]

You have good skills. You are on the right track contrary to what others may say. You just need a little theory. To de-shroud the valves, the intake is the most important. For the intake, multiply the valve diameter times .25 for the lift, this is called the curtain area between the valve face and the valve seat. Now multiply the valve diameter times .20 for the distance from one edge of the valve to the combustion chamber wall (all sides) at the lift previously calculated. The area of these two calculations are each equal to the valve area and are said to be de-shrouded. Now for the exhaust valve, about the same except we multiply the diameter times .14 (in leu of the .20 previously) for the side clearance between the edge of the valve and the combustion chamber wall. The lift is the same calculation. Now all you need to do is use your ball grinding burr to blend the combustion chamber wall between the valve seat and the new point that we have just calculated above. Not many know this and most that do are not willing to share. Now use low/flat dome pistons to achieve you compression. High dome pistons are very inefficient. Good luck and keep up the great KZbin videos.

[@DaveyBlue32]

This is great information buddy…trying to get this guy going in the right way… you laid down the formula for a smooth flowing head!!! Will he take this information and run with it?!! Is he grinding on his own heads as I write this??? I love 2 stroke!

[@normantuil1952]

In

[@glennjones7336]

Well aren't we smart!

[@zonta71]

Thanx buddy

[@donniebaker5984]

a radius edge lathe cutting tool leaves an almost polished surface when cutting off excess aluminum great job increasing the compression ratio

[@91maxpower]

Wow, just wow. No thought to piston squish or frame front, not to mention super shrouded valves

[@MrSagerific95]

This is the definition of built not bought. Absolutely fantastic and very Inexpensive, this is exactly what you buy from those expensive retailers, you just don’t see how it was made.

[@bad406camaro]

Actually it is the definition if hacked not though

[@MrSagerific95]

@@bad406camaro please explain? I’m sure you have decades of experience to share with us? We can’t wait to hear it…

[@bad406camaro]

@@MrSagerific95 Guess you were not able to read my next comment (posted 2 days before your arsine comment) I am sure you are a smart guy you can figure it out

[@morgandelaware7269]

Yup and they don't use nothing fancy to do it either

[@WilsonPendarvis-tn3wm]

Inexpensive like a lathe

[@reidspeed77]

Real deal tuning, the rod fill and lathe work are wizard 👌

[@tinsmith4540]

Did similar to a gs 1000 suzuki head for a speedway 3/4 midget on alcohol in 2009 - worked great @ 12.5 % compression

[@ВячеславРедкокаша]

на изготовление головки цилиндра применяют сплав алюминия и магния. напайка на него алюминия со временем отскочит ( разница в тепловом расширение). направляющие втулки клапанов и клапанные гнёзда вывалятся ( после воздействия высокой температуры произойдёт прослабление посадочного размера). ни когда так не делайте, проще осадить ниже цилиндр или головку . пробовали наваривать подобным образом электро дуговой сваркой в среде аргона ( у меня свар. стаж 26 лет, 2 диплома с личным клеймом), после мехобработки и установки крышки цилиндров двигатель ( ГАЗ-52) отработал 1 день и на второй заклинил. оборвалась наваренная часть. при тщательном осмотре на всех наваренных местах обнаружили трещины.

[@opel5956]

А почему тогда просто вареные ГБЦ ходят? ведь не однократно вниз появляются трещины и их заваривают.

[@chromvanadium4768]

@@opel5956 чуешь разницу? Или маленький кусочек подварить, или целый слой наварить, и разницу в нагреве при сварке.

[@Artegor3000]

Так у него после наплавки и обработки возле седла впускного клапана тупо раковина осталась!

[@alexua5035]

Вы хороший специалист таких сейчас очень мало, очень жаль , в основном компьютерные ,,гении"

[@Petruxa851]

а напайка кастолином? знакомому несколько раз приваривали ухо генератора все равно быстро отваливалось вот интересно если бы изначально запаяли кастолином держалось бы или нет

[@carbytater2242]

11/1 compression ratio! (excellent!) Horsepower rules!!! Great to see budget hot rodders in India do this sort of stuff.

[@wulannastiti1014]

Indonesian

[@transdetendal]

seems to me the flow in and out are pretty fuckerd up this way , all but powergains ,compression isnt all.

[@wolfgangbalu1253]

How precise are these measurements. This is the way we worked after WWII

[@jgreen4715]

A new combustion camber!

[@charlesdefrancisco5056]

Very clever and you have excellent grinder control…

[@peterjohn3180]

Like another commitment said: get/ make a domed piston. I like the way you have done it though

[@paulmichaelfreedman8334]

An engine technician who manicures. Now that's rare.

[@mrdrivermechanictv4213]

Keep it Up Brother Knowledge you are sharing to Others GODBLESSED

[@jbstepchild]

Love that's he's just ripping a dart so natural in the man's space fuck yea buds

[@bobbybishop5662]

I wonder how many engines this guy blows up trying all this off the wall stuff. The info on how to improve performance is ready available to anyone without having to guess at what needs to be done.

[@jeffreyyoung4104]

I wonder if they CC'ed the chamber before and after the work? Or if they were trying to make a diesel engine?

[@kinkincoro8116]

昔トヨタのLASREヘッドの燃焼室をこんな風に削った事がありました。 何か懐かしいな。 街工場でこんな事が容易くできるなんて、凄いですね、すごい技術です。

[@danvandertorre6349]

grate work guys port and polish the intake and exhaust as well.

[@bobbowi2325]

Keren bang, Channel nya di tonton sm orang luar... 👍🏼 Semangat terus ya untuk berkarya & memberi ilmu 🙏🏼

[@АлексейС-н6ш]

На мопеде с подобным мотором FM152 (110см³) проточил плоскость головки на 1 - 1.5мм. Само собой резкого подрыва в мощности не было, чуть по увереннее в горку стал ехать.

[@peterduxbury927]

It's great to see what can be done - in order to raise the Compression Ratio. My theory on this is very simple: When Performance goes up, Reliability comes down. Additional load on the Crankshaft / Mains / Wrist Pin / Big End Bearings. Additional engine heat that needs to be dealt with. Just buy a Bike with a bigger engine.

[@VINCIMOTO]

for changing CR.. we usually used dome/semidome piston rather than adding the head/chamber bcs. stock piston can only hold ranging 11:5 -12 CR.. or else stock piston get easily melt/damage.. changing dome forged pistons increases CR with high durability up to maybe 16 CR .. its the safest and easiest way to modify CR.

[@Wexdue29]

High dome pistons can reduce power if they inhibit the flame spread. They also increase the combustion chamber surface area, which can lead to overheating of the piston crown by absorbing more heat, which in turn reduces power. As always, what is best will be a compromise.

[@VINCIMOTO]

@@Wexdue29 thats why theres flat/blank piston to create you own design not just dome.. Forge pistons are durable to withstand possible damages.. There's less damage in the crown..

[@grantrozwalka7405]

Dudes got talent

[@dirman9463]

Terus bikin kontrn ke gini mas. Jadi kita tau susahnya bikin mesin.jadi ngga ngeluh soal biaya jasa bubut

[@grmch7540]

30% клапанной щели упирается в стенку. Повышение степени сжатия в ущерб наполняемости. Для головок типа hemi (полусферическая) лучшее решение поршень с вытеснителем.

[@dmitriivoevodin404]

У паков ты с голоду сдохнешь, умный такой. Впрочем и у нас есть чюдики полирующие коллектор изнутри...

[@grmch7540]

@@dmitriivoevodin404 Вы сами поняли что написали? И где это я про полировку каналов упомянул. А свои пожелания о голодной смерти оставьте себе.

[@denisovchinnikov6528]

Лучше б турбину установил.

[@luizboiadeoliveirapintogon3141]

Muito competente e ferramental tudo prontinho e nas mãos.

[@buildurtruckurway9118]

i mig welded a head like this before. used a grinder to take the majority of the excess weld off, used a Dremel to reshape the chamber. then used 120-1000 grit sandpaper on glass to resurface it. my only fear is thats an overhead cam engine so when you shave the head more then a few thousandths it actually affects the timing significantly because of timing chain slack. push rod engines suffer from something similar were once you shave so much off you need to get new cut to length push rods.

[@transdetendal]

its timed by the chain to crank so timing is same as before , my biggest cincern is the space for valves and mostly flow for power and airspeed , this did nither but peek compression .

[@pontiacg445]

@@transdetendal The timing is set by the distance between the cam and crank and how many chain pitches that ends up being. Decking the head changes that distance, retarding valve timing. To fix the timing, you'd either need to redowel the cam gear, get an adjustable gear set or do what modern auto engines do and don't even bother doweling the cam, lock the crank and cams with special tools and then just hope and pray the friction between cam and vvt phaser does not give out. How do you not know this?

[@transdetendal]

@@pontiacg445 timing is what it is ,never heard of timeing changed with removing matirial to get more compression , the chain sets the time so a tight chain dosent change setting between cam and crank ! never ever had a issue with timing that way and never will unless the chain skip a tooth or break , same goes in a car engine with chain

[@pontiacg445]

@@transdetendal Yeah, I am well aware that you have never heard of timing being changed by decking the head, that much is obvious. That doesn't mean it's not a fact, it just means you can't comprehend it. I am sorry you are geometrically challenged... Type "timing changed decking head" into google if you wish to educate yourself.

[@dedikurniawan2696]

Wow begitu caranya baru tau, makasi ilmunya mas sukses selalu👍🙏

[@pintobengkel8112]

Hadir nyimak boss ku suksesselalu buatbossku 👍👍💪💪💪💪

[@jhonwilsonramirezbellido6202]

Excelente trabajo maestro saludo desde Ica Peru

[@stratogibson1166]

Modifier le Taux de compression ?!..... magnifique !

[@adikisela409]

Wow...Superb Craftsman skill...

[@david929190]

The amount of shrouding around the valve must kill the air flow. A domed piston would make more sense to me. Or instead of making an oval shape in the head make it more like a figure 8 so there is more space between the valve edges on either side and the head when the valve is open.

[@MrTrevtrev198]

Probably makes less power lol.

[@joejoejoejoejoejoe4391]

I thought they way they used a disc to hold it in the lathe was clever, but I totally agree with your point about shrouding, although it's possible that the valves are oversized for the engine anyway. I'd try to keep as much of the volume as close to the spark plug as possible.

[@davidwickboldt712]

@@MrTrevtrev198 Top end is lower, but bottom end power has to be way up.

[@bad406camaro]

@@davidwickboldt712 only if fuel with proper octane to support the compression is available. otherwise, power gains are negated by the need to reduce timing to stop detonation. remember this is a air cooled engine

[@davidwickboldt712]

@@bad406camaro it is a small bore so not as prone to detonation. Running a tight squish/quench, it should be manageable. And it may have started at low compression ratio also.

[@jorgeantonioromeroespinola2514]

. Aumentar la tasa de compresión, es buena hasta cierto punto... Sobrepasar del 10, haría que el efecto sea exactamente contrario al deseado, pues puede hacer que la mezcla aire/combustible se vuelva líquida, y no gaseosa... Al convertirse en líquida esa mezcla, no se logra buena combustión, y por consiguiente no genera la suficiente explosión o fuerza de retroceso del pistón... . La tasa de compresión con el mayor efecto, está aprox al 9... Ya hemos hecho diferentes pruebas en un taller... .

[@КатеринаДанилова-м7э]

У меня 12 в атмосферном двигателе по заводу

[@ghoulbuster1]

Depende de cuanto aire tenga el cilindro, lo importante es comprimir aire no el combustible.

[@dennistwitchell8821]

The port design kills flow anyway so without filling it and drilling new angles, flow will be limited. We run into this in garden tractor pulling. Port design is for low compression lawn tractors that dont turn a lot of rpm. Yet, pro builder are getting 100+ hp out of 25hp kohler twins running on alcohol.

[@dirtyaznstyle4156]

First time I’ve seen valve clearance cut out of brazing rod filler using the valve guide for alignment. I’m sure there’s a few ways of doing it and I’m not a machinist but always cool to watch one. Nice job though, checked with a mic and everything. The carbide burr on the cordless drill is also one of my favorite tools! Also the makeshift flap sander been there too

[@danilpyakov9787]

Ю

[@tomthompson7400]

thats how old valve seat cutters worked

[@dirtyaznstyle4156]

@@tomthompson7400 makes sense, centered on the center of the valve stem. Just now days all the fancy multi axis machines and all don’t seem to use that method. Like you specifically have to setup the piece in relation to the cutter rather than use something as a guide. Then again a serdi machine uses the guide so maybe I’m mixing up some cnc operations with valve seat cutting. I’d be wondering how different the characteristics of the brazing rod are from the cast aluminum. Like is that combustion chamber gonna expand at different rates because of the two different alloys?

[@dirtyaznstyle4156]

@Water-Man I’m thinking cause some people would find it boring watching him smear brazing rod around lol! That and you can be as messy and as ugly as you wanna be then cut to when it’s semi prettied up

[@uruguayarms]

El trabajo artesanal es hermodso, con las herramientas adecuadas, aunque debe de quedar una compresión como de 13 o 15 a 1, no tengo idea, en una moto normal de calle de fábrica de esas chinas si viene 8 a 1 o 9 a 1 es mucho, yo apenas le quitabas 1 mm as la tapa y ya subía 10 a 1 y cambiaba un montón, ni me imagino con todo ese cambio. El tema que la duración debe de ser mucho menor también a no ser que todo lo demás, bielas, pistones, etc sean forjados y de la mejor calidad. Será para arrancadas o ese tipo de carreras. Me gustaría saber para que las usan .

[@jrsgarage3244]

Very nice work, 👍

[@JHV166]

I am simultaneously impressed and horrified by what I saw here

[@wince333]

idem

[@jamiejazzy]

The torch to light the cigarette is the most important part and that’s the secret to this whole experience🤦‍♂️

[@obsztyfitykultykatykiewicz6740]

Gorsze napełnianie komory cylindra, spowolnienie przepływu. Lepszy efekt daje wypukły tłok.

[@maftuhinpatuk6545]

Keren bang... Terima kasih sudah berbagi ilmunya

[@rusenalikoroglu7235]

good luck to my master, you made a nice engine top cover revision, if possible, you can share the top cover valve seat replacement in a video, that is, the valve seat replacement.

[@izzumitech9287]

ga ngerti mesin tp enak aja liat videonya ... uraaaaaa 😁

[@smmotor2991]

Assalualaikum ikut nyimak nambah elmu sulses slalu🙏👍👍👍😀

[@haroldhprittjr7007]

My dad always said gas is like dynamite the more you compress it or tamp it the bigger the bang and power ! I think as other comments said dome piston would be better . But there are so manny things that can be done to get more . Like if he had the dome piston then he still could have filled in a little . Then port and polishing some dimples around the intake valve pocket . Concave intake valve head to create more vacuum to get the fuel and air in . Then undercut valve stems and a bigger lift and duration on the cam . Then hi flow exhaust and a air cleaner / filter for better flow . Then knife edge crankshaft windage add on’s then higher octane fuel . There is way more than that also so you can see what I’m saying . It’s a thing we’re you get everything you can and those 20 hp add on parts with everything working together be one 30-40 hp parts because they all complement each other and help each of the other parts to produce more !

[@fernesincoca]

Me parece que sube mucho la relación de compresión por lo que genera exceso de temperatura sobretodo en un motor refrigerado por aire, pre detonación disminuyendo la vida útil del conjunto de pistón viela y cigüeñal

[@MGLobo]

Yo creo que es un trabajo que se hace para competir. Se usan otros componentes y combustible aeronáutico de mayor octanaje. O directamente otros tipos de combustible aun mas especiales y raros.

[@marcosmateozambroni3992]

No es así, hay dos formas de dar compresión en pistón o en tapa, lo que se hace en competición es darle menos volumen a la tapa y tiene 3 ventajas inmediatas más allá de la compresión, 1- aumenta el flujo de gases al tener menos volumen y de la forma que lo hicieron acá se logra el torbellino que se busca para mejor llenado del cilindro, 2 permite usar pistón con cóncavo porque no necesitas la saliente o pistón plano lo que hace que se pueda mejorar el torque ya que en el tiempo de explosión se forman dos cámaras hemisféricas y eso es potencia de empuje, osea torque. Y el 3- se puede hacer tarjas salva válvulas mucho más grandes sin comprometer la compresión y perder todo lo antes mencionado esto te da la posibilidad de usar más cruce de leva y más permanencia. Lo que se traduce en un motor súper elástico y potente en todos sus rangos de RPM. Saludos

[@ghoulbuster1]

@@marcosmateozambroni3992 interesante, todo esos beneficios con un cambio de compresión! Con razón los pequeños motores de motocicleta logran producir tanto caballage.

[@marcosmateozambroni3992]

@@ghoulbuster1 es un conjunto de cosas, lo principal el la leva y los conductos, la relación de compresión depende mucho del desarrollo de lo antes mencionado. No siempre más rc le va a dar los resultados esperados.

[@nunesmotos351]

Pra quem tem boa parte das ferramentas necessária o trabalho fica outro nível

[@alcidespereiradasilva9871]

Se você vender a oficina talvez compre o torno.

[@MS-FREEDOM]

凄い技術力ですね。幾何学的な圧縮比が大きく変化していると思います。 但し、バルブの周囲の壁によって吸入抵抗と排出抵抗が増加する方向で影響を受け、実質的な圧縮比は低下するかもしれません。

[@СергейФедорович-с3с]

🤣

[@zoquetetormenta5518]

Muy interesante lo que dices amigo puedes ser mas claro ¡¡¡

[@alejandrovazquezrivero7547]

@@zoquetetormenta5518 mmm 😒 estás subestimando, por eso ahí editor de chat

[@gatau5976]

ora

[@DaveyBlue32]

Nice looking head…boy!!!

[@sparked3113]

Good skills, I enjoyed watching.

[@zzebowa]

You would be far better building it up on the edge of the combustion chamber and levelling it off flat, so the piston almost touches it, and leaving the area around the valves totally untouched and open. This is called a squish chamber, you get very good turbulence and flame speed,

[@gadgetdeez7069]

It's called "Quench" but yes. You're right. They also fucked up and angled the spark plug at the intake valve. It needs to be angled at the exhaust valve.

[@grimreaper6112]

@@gadgetdeez7069 there monkeys

[@dustinhaas2518]

At the end of all that, he just ended up with longer thumb nails

[@fredkemkers9434]

Completely destroying a combustion chamber, the return of the sparkplughole was a miracle, although out of sinc.

[@ricardominero5408]

Show de bola o trabalho que vc fez parabéns muito bom

[@fixitfixit8759]

It’s going to work like a charm hi comp min 1000hp on back tyer all the power you need 💪🏼😭

[@BillSikes.]

Now that's impressive 😮

[@Laserwurks]

You could have milled the head and block and piston and came up with higher compression. And keeping the hemispheric combustion chamber.

[@marktucker1651]

adding a quench area makes more torque&power&better fuel burn as well as less fuel needed.but this guy welded it up then cut that new quench area back out...you cant fix stupid.

[@Laserwurks]

@@marktucker1651 true

[@rizaibnufajar6688]

Gw udah pake cara kaya gt mas.. Dri 2005 🤭 Mantep,padet banget kompresi 😁

[@resepzenius1574]

Untuk motor std boleh

[@pujionoraharjo8830]

​@@resepzenius1574boleh minumnya Ron 98

[@paw6874]

Mantap gan modifikasinya

[@BABAH_AI]

Kepalang pinter ni orang jos ngeng😂

[@ronaldroberts9556]

David Vizard would have a fit!!!

[@ambersmith6517]

pure gold my friend you do magic

[@mauriciocalderon9087]

Este si es un verdadero aumento de relación de compresión sin aumentar la cilindrada

[@autobodycolliosionrestorat3362]

Your better off getting a domed piston to raise compression. You just killed the flow around the valves, plus that nice sharp edge is just gonna cause it to detonate.

[@lorenzolanza8431]

That may be true..but how much does a good piston cost versus 20$ bucks in solder in about 3 hours of work...

[@autobodycolliosionrestorat3362]

@@lorenzolanza8431 costwise obviously doing it this way is cheaper, doesnt mean its the better way of doing it. In my opinion what he did to that head isnt going to work well and will more then likely have problems with detonation/hot spots in the head which would lead to more $$$ damage. Which is why im saying, yeah it costs more, its worth just putting a domed piston in it. You'll still have the flow around the valves, and have the higher compression.

[@joey66436]

Id say context is important. With $100 budget maybe your better off spending $$ on a set of tyres or an upgraded carb, so maby variables. The question you need to answer is what would you do without access to a piston? ie would you weld a dome on the piston? would it hit the valves ? who knows, but the point fron my perspective is a bit of home budget racer performance mods which is half the fun.

[@fiktorrosyidi7752]

Dome piston is more weight than flat piston

[@kevinroberts9394]

Looks like someone has been watching hammer performance work on harley heads you now have a bathtub head. May reduce flow but increase low end torque. It's all in where you want to keep the h.p. at

[@Evan60020]

I'd like to see the before and after numbers on the flow bench.....what's that, he doesn't have a flow bench? Oh.

[@johnriley8314]

....DAMN I WAS THINKING THE EXACT THING THE WHOLE DAMN TIME I STOMACHED THIS VIDEO !!!! -----Ummmmhhh---Ummmhhhh--Ummmhhhh---Maybe a DOMED PISTON woulda gave more compression--been ALOT easier-- then gave the valves a 3 or even 5 angle valve job --IF HE WAS GOOD NUFF TOO !!! LOL----I BET HE JUST TORQUES THE SHIT OUT OF THE HEADS DOWN TO GET THAT little extra boost of good ol COMPRESSION---LMAO !!!! Speed cost MONEY---HOW FAST YA WANNA GO RIGHT ??? LMAO LMAO LMAO

[@mmd8488]

2バルブのバスタブ型燃焼室はスキッシュエリアも理想的な３０％以上でタンブル流の形成も期待出来るし表面積小さく効率も高いと思う L型とかポルシェで多く試されてるバルブ間の障壁は全て削り落としてるけどどうかな？多くの方は落とすとレスポンス落ちるとも・・・

[@ycsyasincornerspeed1535]

Pemain baru y mas.....gw main begitu dari THN 2001 🤭😂🤣😂🤣😂🤣

[@golgothapro]

1st rate & damned impressive !

[@krisnamaulana1114]

Sesudah di Las dan di squish ulang, seting klep dan bos klep nya di ganti ngga gan?

[@TheSilviu8x]

Impressive, as a prototype, but the real one, make sure you thoroughly clean the combustion before welding. The shape of the material must follow the stream of the air, like a cone shape, because your prototype is restricting the flow. Use a canned spray to observe the result. Luka a " wet flow bench at home." This mod, together with a expansion chamber on the throttle body chamber, plus rugged intake walls will increase power without loosing down low torque. Be sure to follow the cutt on the valve guides.

[@KULITEHNIK]

thank you sir, we are glad you want to share 🙏🙏

[@janjandraper9378]

@@KULITEHNIK do you accept headwork like that on a cg150 pushrod type? i'll send you the head from phillippines btw..

[@leiladaquil6587]

You can use different cylinder head to change compression ratio.

[@buckwheatINtheCity]

All he really accomplished was reshaping the combustion chamber into a hemispheric chamber to improve scavenging. He did not install hardened valve seats but he will see large gains in peak revs.

[@TammyDenseDdank5658]

Large gains!!!!

[@fuhkoffandie]

You know that head is based on kawasaki, Yamaha, Honda or Suzuki engine. Those manufacturers put years into flowing those heads to get maximum efficiency & horsepower. You would have been better off just shaving the head 20K, and get the Piston closer that way. Or you just could have bought a Wiseco piston with a high compression, you can choose how much compression you want. I don't know there's easier ways to do that. For sure. And you don't shroud the valves my way at all. You got the talent, you should do something cool like splitting the 5th or 6th Gear, and creating a 7th Gear. I've seen people do this before and it makes a killer transmission, like a Top Gear Overdrive. Much more worthwhile.....

[@wheels-n-tires1846]

Was thinking the same. Looks like an old ATC 185/200S head from the 80s. A piston and a lil cut on head would make easy gains...

[@davidtyce2269]

Good job but you just shrouded your valves it will have more compression and have more bottom end power but won't flow the air on the top end just transition the valves a little more love seeing people make stuff instead of buying parts

[@Honest-sy6ys]

One generally increases the compression ratio to compensate for a performance horsepower type camshaft (OR PORT WORK ON A 2 STROKE) with more duration/overlap and timing which allows for more rpm and hence more horsepower by opening the valves earlier and closing them later. The amount of valve lift must also be taken into account. One does not increase the compression ratio alone if one is smart. When the valve is opened earlier and closed later as with a horsepower type cam, there is less compression pressure built up since pressure cannot build up until all valves in the cylinder are closed. Much less of the compression stroke is now usable. One needs more compression ratio under those circumstances. In order to increase engine rpm from stock one has to open valves earlier for longer and close them later. The longer a valve is open during the compression stroke, the less pressure is built up before ignition requiring a higher compression ratio to compensate for this loss in pressure. Valve lift will alter that as well. Without carefully matching cam or port timing to compression ratio and fuel octane rating availability, one simply ends up with a future boat anchor. If you are not altering ports or valve timing and lift do not increase your compression ratio. Nice Headwork!!

[@ДмитрийГлоб]

Мне интересно как она изменилась ?)) От степени сжатия ) и в чем супер сила то )))

[@senchoprosto8602]

возможно сим деяниям он низы улучшил, но верха обрезал по-любому

[@ДмитрийНовосадюк]

На газ перевел с 76-го. )

[@timurandreev8416]

Здорово, ты на все руки мастер.

[@70sport37]

I have thought of this but would never attempt it because I don’t have the ability to preform it . Good job hope you have good gasoline tho

[@peterjohn3180]

Valve shrouding. Need to take some metal off around valves Also will the metal bond to the cold head? Good though.

[@brutalys]

A Câmara está errada, tem que ser o mais esférica possível, as válvulas tem que ficar expostas, e não escondidas em poços, desse jeito não vai a 9 mil giros nem com taxa de 15 por 1, essa parede em volta das válvulas bloqueia a passagem do fluxo, e os cantos vivos turbilhonam entrada e saída. O turbilhonamento são muitos rodamoinhos microscópicos, a força centrífuga nessas rotações abaixa a pressão nos centros aumentando a pressão nas bordas dos rodamoinhos ocupando a câmara impedindo mais entrada. No caso de 4 válvulas por cilindro é para reduzir a área total de turbilhonamento atrás das válvulas. Desenhe num papel para ver que tanto faz duas ou 4 válvulas em termos de perímetro total que cabe no cilindro, a diferença é que a área de duas válvulas é o dobro da área de quatro. O perímetro possível de se conseguir em quatro válvulas é o mesmo que se consegue em duas com a diferença que a área de turbilhonamento atrás de duas é o dobro da soma das áreas de quatro. Como exemplo, pra não fazer conta, suponha um cilindro quadrado com 10 cm de lado e uma única válvula quadrada com 5 cm de lado bem no centro. O perímetro em torno da válvula para admissão é 20 cm enquanto a área de turbilhonamento atrás é 5x5 = 25 cm quadrados. Agora pense em duas com 2,5 cm de lado cada. A soma dos perímetros por onde entra o fluxo vai ser os mesmos 20 cm, mas a área total atrás delas vai ser a metade, já que 2,5 x 2,5 = 6,25 mais 6,25 da outra dá 12,5 cm quadrados. Isso pra explicar que o turbilhonamento é tão sério que para reduzir inventaram 4 válvulas por cilindro. Você criou dois problemas aí, estrangulamento e turbilhonamento. Quer aumentar a taxa, faça a câmara um pouco menos convexa que a original, mas sem esses cantos vivos, e sem enterrar as válvulas.

[@AP-iv7px]

Now you need a Camshaft with 15mm Valvelift, cause you get no air in the engine.

[@rogersiples3335]

An! This guy is good. Best way to raise compression.

[@dbloewen1]

Compression and fuel flow seems to be total guess work. No calculations on the head to determine actual compression ratio.Good luck!

[@philippejoseph8604]

This should come with a very different camshaft diagram giving a lot of more inlet and outlet timing if not ....

[@josephsaucedo8691]

People in the comments no more the the guy in the video 🤔 maybe he should list and have it translated that way he can put out a useful video so people don't ruin there heads great comments👍👌✌️💯🇺🇸

[@rp75heavy]

Beautiful work

[@juluan289]

Buat piston jenong seperti Harley Davidson.. dijamin lebih paten

[@KorepanovYan1982]

Почему до и после не замерил объем?

[@Frank289100]

BRAVO, GREAT SKILLS YOU POSSESS. THE COMMENTS ABOUT SHROUDING THE VALVES. OBVIOUSLY THIS IS NOT THE FIRST TIME YOU HAVE DONE THIS AND YOU MUST HAVE DONE IT MANY TIMES BEFORE WITH GREAT SUCCESS, AND IT MUST WORK BEAUTIFULLY INCREASING THE POWER. IF THAT WASN'T THE CASE YOU WOULDN'T BE DOING THIS AGAIN. AM I CORRECT ABOUT THIS THAT YOU HAVE DONE IT MANY TIMES BEFORE. HOW MANY TIMES HAVE YOU DONE THIS?

[@6pack1204]

Turn off the Caps and stop screaming !!

[@Frank289100]

@@6pack1204 A FEW DAYS AGO. A FIRST GRADE KID TOLD ME THE SAME THING.

[@6pack1204]

@@Frank289100 That first grade kid screamed less loudly?

[@Frank289100]

@@6pack1204 COMPARING YOU TO A FIRST GRADE KID IS THE DEPTH OF YOUR MENTAL CAPACITY.

[@6pack1204]

@@Frank289100 Where did you read that I compare myself to a first grade kid? I think there is something wrong with your mental capacity.

[@daveharryman6390]

thats why they make high comp pistons

[@Zimbiker]

Always love your work ❤️

[@Rei.EP02]

Keren bang sangat bermanfaat ilmunya 👍🏻👍🏻👍🏻

[@mateusz4673]

Agora pode rodar com álcool puro. Era muito comum aqui Brasil antigamente.

[@mateusz4673]

Inclusive vi uma Honda 125cc com uma turbina instalada que chegava a quase 200km/h.

[@ОлегПономаренко-е5д]

Можно было избежать половины дурной работы! Просто отторцевать головку цилиндра,что подняло бы степень сжатия. Это простое техническое невежество. После такого прогрева,до оплавления,седла просто выпадут во время работ мотора.

[@andybrown2728]

Love it brilliant 👏 how did you get the lug hole

[@andybrown2728]

The spark plug hole

[@SlowBrow]

bos gak diliatin cara nambah daging alminium nya😄