Reply to "Piston clearance"

bosswrenchMember

I currently run 0.004" clearanceon a set of TRW forgings, and this works well enough that I passed CA smog testing with the engine warm. I wouldn't second-guess the mfgrs. Incidently, pistons are not round so mic-ing them is extremely difficult. The skirts are ground barrel-shaped starting just below the rings, so if you must, the micrometer should be below the ring pack, at 90 degrees to the wristpin holes. This area is the closest to cylindrical. Feeler gauges can be used but it takes experience to gauge the drag on a blade, plus, if you insert it too far, you intersect the skirts which are always larger in dia than the ring lands. I've tried it and it only confuses me.

8/2/0311:45 PM

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