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3.0 MFI Port Size Advice Needed
Hi Gang,
I'm currently building a 930/07 (80 SC 3.0) into an MFI engine for my RS clone project. I'm looking for advice on port sizes for a 3.0 engine. The 2.7 and the 3.0 used the same MFI space cam but I'm still unsure of the port size. 38mm? Larger? It will have S-cams, 9.5:1 compression and SSI's feeding a sport exhaust.
I need to send the heads and throttle bodies (stacks too) off soon so any advice would be appreciated.
Thanks!
Re: 3.0 MFI Port Size Advice Needed
Quote:
Originally posted by Neunelfer
I'm still unsure of the port size. 38mm? Larger?
According to B.A.'s book, the 3.0 MFI motor for the SC RS had 43mm ports. That was with 10.3:1 compression and open exhaust. You could probably go smaller.
TT
Hmmmm Sounds Like a Type 930/18...
Thanks for the reply TT,
With both the port size and the compression it sounds like you're talking about a different motor then what I was after.
I'm looking for info on a type 911/77 which was the 3.0 in the 74 RS. The SC RS motor used a different MFI system (Kugelfischer I believe). The 73-74 3.0 RS motor used the Bosch, it even had the same 2.7 space cam. Ironically, it's the only motor on Bruce's chart that doesn't give port dimensions. :(
Your thoughts?