Hey guys.
Setup is a 2.4L long rod 4g64. Manley I beam rods, wiseco 1400hd 87mm pistons 10.1 cr.

Any recommended bearing and ring clearances for over 500whp?
Thanks

 

So far I am getting .005" x bore to get my top ring gap. .0055"x bore for middle ring and .0015" for oil rings?

 

That looks good but the oil rings don't need any work, just put them on the pistons. Bearing are good around .002-.0025.

 

Called my local Mitsubishi deAler and the oem specs are Rods: .004-.009" and mains are .0008-.0015". Today I am receiving my ACL race bearings so I will measure them to see what clearances they give me to begin with.

Also what head gasket to buy? I would prefer oem but do they make a oem 87mm head gasket?

 

standard mitsubishi bearing clearances are very tight because it's designed for 300hp and 5W30 oil.

0.002" for both mains and big ends is about right.

 

I think my bearing clearances are: Mains @ .003, Rods @ .003, top ring @ .018, bottom ring @.022, piston to wall clearance .0035

 

that seems really loose on the bearings and really tight on the pistons.

 

heres a screenshot out of the factory shop manual for 4g63 evo 8

 

I would be ok with running those piston ring gaps and PTW clearances, but use tighter rod and main bearing clearances. Something like 0.0023" - 0.0025"

 

That was 7yrs ago. That motor either lasted, or it (probably) didn't...lmao

 

Gotta love these old threads.