AydinZ71 Posted November 2, 2021 Share Posted November 2, 2021 Hi all! Got the results back on sonic testing my N42 (early L28) core. Copy-paste from my machine shop (Mountune, race engine shop here in Southern California). “So we are seeing .160" in a few places on non thrust sections of the bore. Our view is this is about the minimum thickness on a turbo engine. We would not go more than another 0.010" and .020" on an NA engine. Thrust areas are .305" to .196". “ Other than the .16 non-thrust thickness, overall I’m encouraged with the results. Keep in mind, although the machinists in the shop have experience with L-series, they don’t have experience “pushing the envelope” on these engines. They (re)build race engines for Honda, and specialize in custom made Ford Cosworth crate race engines. NA application: Based on the forums direct first-hand experience on engine wall thicknesses, what are your thoughts on overbore? It seems they are recommending no more than 0.02”R, or +1mm dia. With the wall thicknesses provided, do you feel they are being a little conservative? How far would you go? Turbo: if I chose to use the block for my upcoming turbo project, I will not be boring at all. The extra stroke will help with low-end spool and the extra displacement from boring is not worth the risk. Quote Link to comment Share on other sites More sharing options...
AydinZ71 Posted November 8, 2021 Author Share Posted November 8, 2021 (edited) bump Any takers? I’m leaning towards a +2mmD overbore. That would leave me with .120 at the very minimum spots which are off-thrust sides of the walls. respectfully -Aydin Edited November 8, 2021 by AydinZ71 Quote Link to comment Share on other sites More sharing options...
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