cover8

Yes, I searched...getting an engine ported and looking for some valid numbers for new/rebuilt streetported engines.

It seems (from previous threads) that there is a difference...but how much? I am going to pick up my car next week and want to make sure I am getting my money's worth.

>=100psi warm? >=110psi warm? Please cite literature or mechanic (like pettit or a-spec, rx7store, kahn etc) if possible.

TIA

Narfle

iTrader: (16)

i dont think there should be any difference, perhaps you are thinking of vacuum pulled at idle?

impactwrench

same as stock

Kevin T. Wyum

You'd have to modify the rotor itself to change the compression.

RotaryResurrection

iTrader: (8)

No difference in compression. Compression is pretty much just a measure of wear on housings and seals, how tightly they're sealing. You will get reduced vacuum at idle out of a port depending on the size and style, anywhere between 10 and 15" of vacuum is acceptable for a ported motor.

F1blueRx7

iTrader: (5)

I get 10 at 750 idle, and 15 at 1100 idle.

Kevin, I'm searching for a tps to get back to you.