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patkeefe patkeefe is offline
one of the great unwashed
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Join Date: Apr 2004
Location: Ringwood, NJ
Posts: 2,850
Funny, I was just reading your thread about lag when I saw you mentioned the custom piston you have, and was going to ask you about it. I was a bit unsure of how the differential was maintained. I thought it was maintained by the smaller of the two pistons...after all, there are only two moving parts in the entire system, and the smaller piston, I figured, allowed more fuel to bleed back off the control pressure side, thus increasing volume ultimately to the injectors. Your explanation makes sense to me.

Anyway, the IA head has a really nice piston and scratches or nicks in the bore. The one I just rebuilt was a bit scratched, but I cleaned it up, and it moves freely.

Patrick E. Keefe
78 SC
01 Boxster
Old 06-15-2008, 08:01 PM
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