Thread: Supertech over sized valves & N1 Cams

Simple and easy.

Intake valves need to be larger to allow more air to flow through.

Second, the intake charge just because its more cooler doesnt mean its more dense. The exhaust was compressed gasses that are now expanding and have a higher velocity and dont require such a large port to flow the same amount of volume. The expansion does most of the work.

Third we just dont know what your getting at with the whole thread. Intake valves need to be larger, yes. Both ports need to flow better, yes. All this will help.

Nothing more needs to be said about it.

I have spend a lot of time with the guy that did some extensive port work on my VE Cyl head.
He assured me that with stock bore, you are better off with the stock valves. There is not a lot of room around the seat to allow for more flow, although the flow bench will show an increase with bigger valves. Once bolted to your 86mm bore, you will actually loose flow which will result in HP losses.
I have recently sold that ported Cyl head to a guy that races in a 1600cc class with a SR16VE power train. He picked up 25HP at the wheels just with a decent port job and obviously with a tune.

So with all this being said which combo of valves and springs and retainers would be good for a built DET with a VE head shooting for 500+WHP with a 9000rpm redline and 30+psi thats wont break the bank? BC??? Supertech???

ok ass...

it turns out we are both wrong. at least in a "perfect" cycle anyways. the density remains the same.

Isochoric process - Wikipedia, the free encyclopedia

so actually the valve sizing should be chosen on what you plan on doing with YOUR engine. if you want a more torque based engine then choose bigger intake valves. N/A engines tend to have larger intake valves because nothing is assisting the air in the engine besides atmosphere and valve timing. if you want a more HP based engine then make them equal in size or close to it. on high boosted engines you can run larger exhaust valves because you have a "pump" pushing air in and nothing (extra) helping the exhaust size.

i hope we can all just be one big happy family now

this guys motor must be seized

Anyone run these valves without further notching the pistons?

Didn't the guy with the ITB build that picked up like 25whp run smaller than stock valves on his VE?

Saw the thread about 2-3 weeks ago on this forum.

How the hell did he run smaller than stock valves? Is that even possible.