![]() The 1600 I built for Mark in Sydney was a measured 11.4:1 static. and that will open up more options for camshaft choice (longer duration) as it's not really static CR that's the be all and end all, it's the dynamic CR you achieve when you factor in the fact that the inlet valve closes well after the piston is on it's way back up the bore after BDC. Personally I would be aiming a little higher with the static CR. Many more modern engines, and variations of the sohc architecture (like the bravo dohc engine) use a much smaller width above the top ring land, the sohc engine by comparison is very wide, and that's dead space you want to minimise, for both performance and emissions. Given that the pistons (from KS at least) are precisely the same casting for all variants from 34.15 to 35 CH, taking material from the top of the crown isn't an issue IMO, I myself have taken a regular Mondial and KS pistons from 34.7 and 34.45 piston and reduced the CH to 33.5 with no issue several times. Learned that Kolbenschmidt means "piston maker" in German. Once the block is cleaned we'll mock up the build to check compression height, then modify the pistons, then final build. Ordered OE NOS main bearings, Clevite rod bearings, and thrust bearings this morning with all the seals and gaskets I don't already have in stock for the build. ![]() He doesn't want to shave the crowns, idea being the top edge of the piston develops the most heat. In looking at the distance between the crown and the first ring, we'll opt to enlarge flycuts to adjust CR. We then had a conversation about shaving the crowns to arrive at a reasonable compression ratio. ![]() He will also pull the head studs and lightly skim the deck. Calculated bore diameter and read the spec engraved on the piston, determined all we'll need is a block hone. Measured the bores, and fortunately I brought the Kolbenschmidt 86.4s along. Measured the journals then and there, no need for turning the crank just a polish. ![]() Poor guy has been slammed, as another veteran machinist has diverted all his jobs to this shop due to a chronic health issue. Update - dropped in on the machinist (great reason to run the X) to nudge him. ![]()
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