Built motor guys; Rod & Main Clearances
01-20-2017, 05:57 PM
#81
the engine will be fitted with gtx 3582r. wiseco pistons 9/1 cr , inlinepro extreme rods, 2.2 crank, and wet sump ( oem ) with accumsump and oil cooler. oil I was thinking 5w40 or 5w30
My concern is that aluminium block expand more than the steel crank and can increase the clearances more than 0.002" on the mains when its hot. is that an isue or thats perfectly fine? because the rule is 0.001" per 1" of jornal diameter, mains diameter is around 2.1 inches, so 0,002 suposely is fine and within the rule.
My concern is that aluminium block expand more than the steel crank and can increase the clearances more than 0.002" on the mains when its hot. is that an isue or thats perfectly fine? because the rule is 0.001" per 1" of jornal diameter, mains diameter is around 2.1 inches, so 0,002 suposely is fine and within the rule.
01-20-2017, 06:07 PM
#82
We build every motor with a minimum of .002 clearance. Honda motors are on the tighter side but they were never meant to take the abuse that we put to them. The stock motor in my car that made 765hp, ate a main bearing and destroyed the block beyond repair.
After looking at the stock tolerances, I am starting to think that the cause of the bearing failure had something to do with the stock bearing clearance. I am not blaming it totally on that alone, but I would have never ran that of type of clearance on a motor that will see big power.
I've got a new short block that has been sleeved by ERL which is almost done. We are running acl race bearings at .002 clearance on both mains and rods. I've build tons of motors at that spec without any bearing issues.
After looking at the stock tolerances, I am starting to think that the cause of the bearing failure had something to do with the stock bearing clearance. I am not blaming it totally on that alone, but I would have never ran that of type of clearance on a motor that will see big power.
I've got a new short block that has been sleeved by ERL which is almost done. We are running acl race bearings at .002 clearance on both mains and rods. I've build tons of motors at that spec without any bearing issues.
Did you experience any drop of oil pressure with that clearances on both main&rod bearings ??
12-10-2019, 11:56 AM
#84
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