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Join Date: Jul 2002
Location: IL
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What to use for 8.1 commpresson on turbo Motor

I am in the process of rebuild the motor (top end)

it is currently 1984 3.2 turbo @9.5:1

what are my options to achieve 8.1:1 compression

Thank You
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Old 02-23-2005, 07:03 AM
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If you have good ring seal you could install a different set of cams that would A) Be compatible with a street turbo set-up and B) Bleed off some of your existing cylinder pressure which will have the same effect as reducing the mechanical compression ratio.

PM John (Camgrinder) for advise
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Old 02-23-2005, 08:01 AM
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How about Mahle 98mm turbo pistons?
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Old 02-23-2005, 09:38 AM
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Somewhere in the Midwest
 
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Tony,

I am having my cylinders bored and Nikasil plated to match 98 mm JE pistons. I'm not going to go as low in CR as you will, but I believe the JE pistons can be ordered with the CR you want.

I'm building a 3.4 Turbo.
Old 02-23-2005, 09:43 AM
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I wanted to do what wydryd was interested in
Boring from 955mm to 98mm
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Old 02-23-2005, 10:12 AM
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Somewhere in the Midwest
 
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If you mean by boring and replating..that's what I'm doing.
Old 02-23-2005, 10:33 AM
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Does anyone have a pic of a JE 98mm piston dome? I was wondering if they do custom compressions AND custom domes for those of us that have twin-plugged our engines.
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Old 02-23-2005, 12:36 PM
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I had JE make custom pistons for me. You can see a pic at:

http://www.brookstonefarms.com/930rebuild_page2.htm

I am building a motor that has a stroked (964) crank, super 964 cams, custom 98mm pistons and 3.2L cylinders bored out to 98mm (better cooling than the 3.3 cylinders and A LOT cheaper than Mahle).

The compression is 8.0:1 with very little dome on the pistons.
Old 02-23-2005, 04:47 PM
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Thanks, Don
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'85 930 Factory Special Wishes Flachbau
Werk I Zuffenhausen 3.3l/330BHP Engine with Sonderwunsch Cams, FabSpeed Headers, Kokeln IC, Twin Plugged Electromotive Crankfire, Tial Wastegate(0.8 Bar), K27 Hybrid Turbo, Ruf Twin-tip Muffler, Fikse FM-5's 8&10x17, 8:41 R&P
Old 02-23-2005, 05:36 PM
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