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Thread: OMC Cross Charge Mod questions
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02-25-2018, 02:12 PM #121
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02-25-2018, 04:43 PM #122
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02-25-2018, 04:50 PM #123Screaming And Flying!
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[QUOTE=spybot;3023809]Is there a point where too much compression is bad for the engine ??
Nahh
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02-25-2018, 07:27 PM #124Screaming And Flying!
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Like racer I have seen many 135's over 150psi especially after a rebore
There is a SAE paper on the Japanese testing comp, at about 18,000rpm it needs to be reduced.Last edited by powerabout; 02-25-2018 at 08:48 PM.
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02-25-2018, 08:39 PM #125Screaming And Flying!
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Different application but still xflow, above 195psi cranking too far was shown to hurt high rpm ability, meaning didn't hit the same rpm or rate of climb . That info came from a factory R&D man back when.
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02-25-2018, 10:51 PM #126
I have a "different application" smaller bore Merc crossflow with significantly higher cranking compression; I get pretty good rpm and fantastic acceleration/rate of climb, acceleration much greater than stock and at least the same top rpm as stock compression motors, so I am not blaming compression for limiting my rpm. Looking at stuff that may be limiting the stock motors and working around that.
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02-25-2018, 11:06 PM #127Screaming And Flying!
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It wasn't the low and mid which suffered, but just the top end in that example. The max was about 205-210 range , which was about 10-15 over stock, low and mid wasn't hurting. Likely increasing dynamic pressure values at high rpm vs over rev hp curve I believe was mentioned.
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02-26-2018, 11:57 AM #128
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05-26-2020, 09:51 PM #129Screaming And Flying!
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Someone was mentioning coil mounts. Xflows v4, some nice ones in this thread.
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powerabout, hq_ thanked for this post
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09-11-2022, 04:14 PM #130
Yeah I’d love a set of those coil mounts for my build