050 between piston and cylinder edge, cylinders torqued down to about 20 ft/lbs with nuts and washers on each head stud corner. It is nice, of course, to get the piston further out towards the edge of the cylinder. But, I do not acutally know your combustion chamber volumes. 028 sealing rings (if your flycut will allow you to) will give you a 7.5:1 compression ratio, which is perfectly acceptable. If you have the deep 15cc dished pistons, then deleting the. The need for a cylinder head sealing ring may have been caused by the usual bugaboo, too deep of a flycut. you are spot-on with a 7.3:1 compression ratio. Would these deck heights, with the additional clearance of the shim, result in too much deck height?Īssumption I : you have 7mm shallow dish pistonsĪssumption II : you have 52cc combustion chambersĪssumption III: you have that. I don't know if that would indicate that these heads have ever been flycut or not. I have not cc'd the heads yet, but on both heads, the cylinder mating surface is approx. I bolted the cylinders down and took measurements between the top of the cylinder and the top of the piston right at the outer edge of the piston, at 12, 3, 6, and 9 o'clock positions.
I pulled the heads tonight, and measured the deck height of each piston as best I could with my digital caliper. Vwlover77 wrote:Jim at the Air-Cooled Ranch suggested that too much deck height might be the reason why the CB Performance Torque Special camshaft in my engine idles so poorly.
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