Quote:
Originally Posted by MBruns
You wont need them for clearance but .010 in. off the heads can make more compression than you may want for a boosted engine at 1 bar, I would add the base gasket dimension to bring it back to what you had, short of figuring out exactly what you have now by pouring and calculating that is the safe bet.
Mike Bruns JBRacing.com
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So he was correct in the clearance part.
Quote:
Originally Posted by cgarr
.21mm would bump your compression .20 with a 74.4 stroke 98mm bore engine. assuming your at about 9 right now. Do you know where its at right now? It would only be about .12 if your around 7.5 now.
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I used a CR calculator and IIRC, it was 7.5:1. All the dimensions I have are correct but the one I searched and wasn't 100% was the 90cc combustion chamber size. I too figured it would bump .20 by the calculator.
Now I have to decide if I want the bump or not....it would have a slightly better off-boost response but probably would not make up for the extra cylinder pressure on-boost.
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Cory - turbo'd '87 C3.2 Guards/Blk, 3.4, 7.5:1 CR, 993SS cams, Borg-Warner S366 turbo @ 1.2-1.5 bar, Treadstone full bay IC, 70mm TB, TiAL F46 WG, HKS 1 1/2" BOV, twin 044 pumps, MicroSquirt AMP'd w/GM smart coilpack, Bilstein coilovers, Tramont replica Speedlines (285's rr, 225's frt), Big Reds frt, 993 rr., tower brace, MOMO wheel
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