Quote:
Originally Posted by pgfpro
My concerns are with a coating it might change the dynamics of staying clean and could alter the performance. The only way to test it is to coat the pistons and see what happens.
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Didn't you have a spare engine which you could use as a testbed? Or enough parts to make some sort of single-cylinder derivative of the 4G63 exactly to use it as a testbed prior to applying some design changes to your project, or maybe discarding some failed designs at a lower cost compared to a regular 4-cyl?