Duke

I'm posting here because I think there is more knowledge about these heads here than in the 944/968 forums.

I don't have a 4-valve/cyl head loose here so I'm looking for as much information I can find about them for computerized engine simulations.

So please fill in what specs you have about them! I guess the 928 32v heads are a bit different than the 944 S2 and 968 heads but I'm interested in all specs like:

Valve sizes?
Port diameter?
Port length?
Flow coef or if you have a flow figures at different lift?


TIA

Vilhuer

All heads have almost identical combustion chamber and port designs if '85-86 32V 928 is not counted in. '87 model year forward intake valves are 37mm and exhaust 34mm. Only 968 has 39mm intakes. Port size ect. is harder info to come by. Some flow numbers were published in 928 Forum magazine article IIRR. This info measured by Phil Threshie might be in archives also.

IcemanG17

I want to say the stock S4 head flows around 270cfm with a .400 lift? This is strictly from memory.....which is generally sketchy to start with!