Talk to your engine builder at length about the main bearing clearance. .0025 on the rods would probably be OK as a minimum. IMO, .0025 on the mains is too tight, even with 10W-30 oil. If you were making 500-600 HP, that would be fine. 1200+ HP, dozens of black and blue main bearings tell me a different story. If in doubt, run on the loose side. Good luck with the build. This will scare the hell out of you. At 3000+ HP, the only way to make the main bearings live was to run .006-.0065" main bearing clearance on a 3.0" main bearing. The engine will tell you what it takes to make it happy! The learning curve was expensive in our case.
|