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beepbeep beepbeep is offline
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Join Date: Jun 2001
Location: Sweden
Posts: 5,565
Hello!

Reason for 32mm ports is off-boost torque. Engine has 7:1 C/R and is a pig w/o boost, delivering staggering 120hp w/o the huffer.

Porsche used those strangled intakes to improve gas velocity and thus cylinder filling at low load.

Frankly, whole intake system on 930 is a mess. Pancake plenum flows badly and uneven. Cylinder 1 has noticeably lower flow than cylinder 3 etc. CIS barn door is also in a way. It's a small wonder you can get 300hp from this.

Only way to do it "right" is to fit Carrera intake, but then you'll find out that ports don't match. I believe sand_man's drawing is an adapter between Carrera intake and 930 heads.

Unfortunately, 930 heads won't match perectly with Carrera intake even when ported so tuning a 930 engine with Carrera intake is PITA-job.

Frankly, I believe cheapest way to do right from start (if hunting big HP) is to sell 930 engine and do a turbo conversion of Carrera engine or fit Carrera heads from start. Crank and rods are the same anyway.
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Last edited by beepbeep; 07-04-2008 at 02:15 AM..
Old 07-04-2008, 02:08 AM
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