ACL RACE Bearings
06-12-2017, 08:53 AM
#1
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ACL RACE Bearings
Hey, I'm one of the many lurkers on miata turbo.net
I'm currently looking for info on how i should build my engine, mainly looking for info regarding bearing clearances for a high revving turbo build up to 400whp range but limit torque to 300-330ish because 6 speed, Unfortunately Australia doesn't have many high powered Mx5 builds nor the engine builders knowledge of BP engine's that others in the states do because of sheer numbers.Cheers
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06-12-2017, 03:57 PM
#2
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I'll venture addressing your question as far as I know based on personal experience. If your mains are standard size, get standard sized bearings and only a micro-polish on the crank. This has worked for me. Good luck.
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06-13-2017, 01:10 PM
#3
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When i built my engine (again) I had a rub in one of my crank bearing surfaces from when my oil pump failed. I ended up with the undersized bearings and the machinist kept the stock clearance, but towards the high. I was just in my engine (after only about 100 miles and a few dyno pulls) for more piston to wall clearance for higher boost other **** and it all looked good. I would think keeping everything as close to even across all bearings will help more so. I usually just ask my engine builder and go with what he says. Crank clearance is crank clearance, a good builder should be able to give you decent guidance there (oil pressure, oil weight, engine use). Generally from what I know alittle extra clearance helps in high HP motors.
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