installing new piston in warrior

[Gen1Pat]

Exhaust valves are always smaller than the intake. The intake valve gets cooled by the fuel/air mixture that passes over it, thus allowing it to be larger because it will not warp like the exhaust. The exhaust valve doesn't get any type of cooling, so it has to remain small in order not to warp or disstort.

 

[Rhyno]

Exhaust valves are always smaller than the intake. The intake valve gets cooled by the fuel/air mixture that passes over it, thus allowing it to be larger because it will not warp like the exhaust. The exhaust valve doesn't get any type of cooling, so it has to remain small in order not to warp or disstort.

Exhaust valves are not always smaller. It is easy to perceive, as a standard, though....

There are a few cases, where the intake valves are the same size or smaller than the exhaust. I can't name them all, but the first one to comes to mind, is the first generation Yamaha Genesis series. It came in close to 1000cc's and had 3 intake valves and 2 exhaust per cylinder. The intake were/are smaller...

Another is the first generation Chrysler/Dodge Hemi-Sperical Head series. Intake and Exhaust were the same size. Later they were updated to have a larger Intake valve and runner.

I have seen a few Honda's (car engines), too. (same sized)

I am sure that there are a few Exotics/imports that are similar, but I am drifting into the AUTO side of things.....

I have never heard the "Temperature" explanation, for valve size, but there is some partially correct info in there.

The Intake valve is cooled by the Fuel and Air charge....

Metallurgy, or molecular recipe and Dimensional Structure (the shape and angles) controls "warpage." You'll find that info in manufacturer's claims of higher temps and such.

From my understanding, from what I was taught, and remember it was someone else's opinion passed on to me....

Larger intake valves were a compromise of available head space, intake runner volume, available head structure, and Performance...

Like what was said in another thread, intake charges come to a stop and compress when the intake valve is closed. Somebody found out that the larger the intake runner Volume, the better the performance, at higher RPM's. (Of course there is a point of being too large/ too much capacity..)

So, here are a few examples, but I know that this is a partial list....

Take it for what it's worth.....

-Rhyno

 

[Rhyno]

Here's a link...

http://i68.photobucket.com/albums/i10/hairyhampton/FZ750 stuff/P1020049.jpg

And another

http://i68.photobucket.com/albums/i10/hairyhampton/FZ750 stuff/P1020057.jpg

 

[dillon14dj]

haa true, but you might need to know for sure so you can jet itor change the needle setting, or exhaust so everything will equal out? Just a guess.lol

ya but i hope i dont have to do that. and i f-ing hate ebay now! ordered the other side gasket a few hrs ago.. just went back on and my account is block and suspended saying its linked to someones elses account like wtf!. just hope the guy still sends out this gasket tho

 

[MidwayUSA]

Exhaust valves are not always smaller. It is easy to perceive, as a standard, though....-Rhyno

I can attest to that. I just did a Raptor 660 head. 3 intakes 2 exhaust and the intakes are much smaller than the exhaust on it.

It definitely doesn't so much relate to cooling. It is more about flow and efficiency. Heated burned mixture is easier to get rid of and doesn't take near the valve or runner size to flow. Intake mixture is cooler and denser so has to have a larger valve and runner to be able to flow well.

 

[codysisk13]

ya but i hope i dont have to do that. and i f-ing hate ebay now! ordered the other side gasket a few hrs ago.. just went back on and my account is block and suspended saying its linked to someones elses account like wtf!. just hope the guy still sends out this gasket tho

wow its always something. make us some videos of the progress!

 

[Gen1Pat]

Yeah, most 4 and 5 valve heads have intake valves that are the same size as the exhaust. But that is fairly understandable, because of the lack of space to put 2 or 3 "normal" sized intake valves in the head. I was talking about the warrior specifically. But, yes I have seen several of the jap cars using the same size intake and exhaust valves. The valve size in relation to the temps is just what popped into my head at the time. Unfornutely, there are so many head and valve designs, theories, facts, and even porting and valving "tricks", that we could talk about them until we are blue in the face. Be a fun read though