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copbait73 copbait73 is offline
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Join Date: Nov 2003
Location: Chesterfield IN
Posts: 1,336
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Sounds like an interesting project with some twists.

Several years ago I polled the guys on this site who had high HP engines. I was looking at the impact of twin plugging. In the process I found their engines all fell in orderly fashion on an old Porsche engineering chart of boost vs. geometric compression ratio.

All were running at roughly 12.5:1 effective C.R. on available pump gas. Represented was 7:1, another 7.5:1 and then 8:1C.R. At your chosen 8:1 compression ratio, 1.2P.R. is in no mans land but your goal of 500HP was demonstrated at .8 bar so the high boost shouldn't be needed.
Old 06-24-2011, 06:23 AM
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