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B20E Head height 140-160

uid 32173's pic
posted by  Gary L on  Mon Aug 8 05:39 CST 2005
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last visit: Wed Oct 22 10:26 CST 2014
[RELATED]

- quote - "You're in no danger of hitting the valves, and shaving the head won't cause any problem there."

I don't understand... the clearance between the valve head and the piston is directly affected by head height... the more I shave the head, the closer to the piston the valves become. I don't see how it can avoid becoming a valve-to-piston clearance problem at some point.

- quote - "So, you have a zero deck and .030" gasket (is that what it crushes to?), so you have .030:piston-to-head clearance. I usually consider .032" the safe minimum for Mahle pistons on stock rods that have been rebuilt for absolutely even length and then shot-peened to stay that way, for a motor that will see 7000 RPM (forged pistons need more clearance than that). You're pushing it, I'd say..."

Yes, the head gasket crushes to about .030". And I agree I'm pushing it, but the only time I've had a problem was with a badly over-revved (stretched) rod. (There are pictures of that particular failure in the technical area of the Brickboard gallery.) FWIW, I normally stay below 7000, with the shift light set to go off at 6700. However... downshifts can sometimes be a problem. ;)

- quote - "I thought ITB required stock compression ratio -- ???"

Actually, IT rules allow half a point above stock CR, so I can legally go to 11.0.


--
1971 142E ITB racer, 1973 1800ES, 2002 S60 T5






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