i posted this on a couple forums and im trying to get the general consensus on what i should run for bearings, it seems that “green” oem bearings will work but will be right on the “tight” side
k24
blue print I beams
cp 87mm 12.5:1 pistons
well i have everything measured out and im about to order rod bearings and i came up with these clearances with using green bearings
using this rod bearing chart i found
Blue 1.510-1.507 mm 0.0594”- 0.0593”
Black 1.507-1.504 mm 0.0593”- 0.0592”
Brown 1.504-1.501 mm 0.0592”- 0.0591”
Green 1.501-1.498 mm 0.0591”- 0.0590”
Yellow 1.498-1.495 mm 0.0590”- 0.0589”
Pink 1.495-1.492 mm 0.0589”- 0.0587”
Red 1.492-1.489 mm 0.0587”- 0.0586”
im not sure if that is too tight or not, if i can get away with those clearances i will just buy acl’s if not i will go with whatever color to get me what i need for what people think is proper clearances (ive always done .015)
the motor is for a street car, right now will have stock cams but plan on upgrading later to something bigger and try to hit 300whp
i plan on measuring up the piston rings and was wondering what people recommend for them also, its an 87mm bore k24 and i might shoot a little nitrous later on, but nothing more than a 75 shot and i want this motor to be reliable and make good power on 93 octane
Hmmm not really sure where to start with helping you out.
Please tell me journal diameter? and what you are using to measure your clearance?
As far as pistons ring that is an easy one. Go with what the sheet says that comes with the piston rings. I am sure it will list NA, FI, blown nitro, nitrous to 150 hp and nitrous 150hp+. Usually the numbers are .0050", .0055" or .0060" x inch of cylinder bore. Then no matter what the ring manufacture recommends always make the 2nd ring gap equal or a tad more than the top ring gap .001-.002".