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copbait73 copbait73 is offline
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Join Date: Nov 2003
Location: Chesterfield IN
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Quote:
Originally Posted by slow&rusty View Post
Can be run up to 1.3bar....GULP!
Yasin
This posting intrigued me and a quick review of the published Porsche racing engine data shows the boost level (1.3bar) was real...for those times. Actually, assuming they dropped the C.R. back to 6.5:1 and used the cam indicated, the power is right there in the books.
This really wasn't as much enlightenment as a reminder of the 930 TURBO we knew in it's time...not now, 30 years later. The TURBO of old wasn't a street machine, the first batch was an homologation, then the marketing departments follow-ups were very expensive exotics meant for one thing, top speed. For that it needed HP.
Since then it's been the Porsche marketing and Porsche buyers who have demanded and received a machine with usable power and thrills in a very speed limited world. It is the current crop of old and new TURBO owners who desire their thrills at something less than 100MPH so the engine has grown in displacement, retained very mild cams, smallish ports and more importantly the C.R. has been raised. All the while our fuel has become a sick joke. For the most part Porsche has used aerodynamics and technology to deliver top speed in modern TURBOS.
Watch that Porsche Porn video. That extreme power is there in a large 3.6L cammed, higher reving, lower compression motor running on corresponding HIGH boost. Serious cams, porting, Large turbo(s) and compression ratio reduction are almost unheard of today in the quest to build midrange torque. Lost knowledge?
If you want MAX HP, and can wait for it, it's still there. I think a comment in the Porsche Porn thread is he does "unconventional things to his engine". ...probably follows the TURBO racer component list of 30 years ago.

Last edited by copbait73; 02-13-2008 at 04:46 AM..
Old 02-12-2008, 07:43 PM
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