Valve size
Turbo Mini Forums

Now when speaking in terms of valves for all out power in a N/A format, the bigger the better aswell as quantity ie:16V.
But when we talk turbo, does this still stand ?
I do realise that big N/A power sacrafices low end power / torque, but in a turbo, the air is being forced in, more torque / power is produced compared to N/A lower down the rev range.
When you look into full on drag cars, valves irrespective of N/A or turbo or supercharged, they go BIG.

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If it a'nt broke don't fix it !!!!!!!!!!!!!!!!!!!!!

Obviously the same applies. Bigges holes equals more power. The thing with turbocharging, is that there are several other ways to the same goal.

as above really,

its woth noting that with big valves the gas speed lowers, so at overlap stuff can flow the otherway easier, this can be exagerated on turbo's due to exhaust pressure being higher than boost etc...

Would I be right in thinking that the valve area on a 16v head is far greater standard size, than the largest sized 5 port valves you could fit?

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1/4mile in 13.2sec @ 111 terminal on 15psi

Edited by robert on 3rd Oct, 2011.

Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM

What if you add lift to the equation and get valve CURTAIN area?

then you throw cams into the equation... what lift, how fast etc.

I thought that throat area less stem area is the critical dimension. Where the velocity is the highest.

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