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Old 12-26-2020, 12:55 PM
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Join Date: Aug 2013
Location: Canandaigua, NY
Cobra Make, Engine: SPF MKII Riverside Racer FIA
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The engine builder wants to go .030 over as the block comes requiring final honing and going over gives him more room to adjust for discrepancies in the block bore that may be there. Since the pistons will be custom, they cannot be returned and if a cylinder requires over boring then, we would have to buy another set. Since we are getting custom pistons, he suggested that we order 10 instead of 8 just in case something happens to a piston, we will have a spare as it is not easy to get someone to build just one piston and it gets really expensive to have a small number built.

Not going to reuse the old pistons as we are dropping the compression ratio and they are popups. Also, pistons show some evidence of going lean at times with some heat spots that did not burn through. I am adjusting the fuel pressure and jetting and when it is all done we will be finalizing the air/fuel ratio on a chassis dyno so that we get more accurate information pertaining to actual use on the track as opposed to an engine dyno.

Jim
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Last edited by 1795; 12-26-2020 at 12:57 PM..
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