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Need help with bearing clearances and ring gap clearances?

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Old Mar 13, 2012, 12:48 PM
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Need help with bearing clearances and ring gap clearances?
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
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Old Mar 13, 2012, 12:58 PM
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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?
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Old Mar 13, 2012, 01:02 PM
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That looks good but the oil rings don't need any work, just put them on the pistons. Bearing are good around .002-.0025.
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Old Mar 13, 2012, 01:48 PM
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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?
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Old Mar 13, 2012, 04:49 PM
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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.
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Old Mar 13, 2012, 05:47 PM
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I think my bearing clearances are: Mains @ .003, Rods @ .003, top ring @ .018, bottom ring @.022, piston to wall clearance .0035
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Old Mar 13, 2012, 06:26 PM
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Originally Posted by kailoma679
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.
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Old Jun 14, 2019, 08:10 AM
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Factory Service Manual pic

heres a screenshot out of the factory shop manual for 4g63 evo 8
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Old Jun 14, 2019, 01:33 PM
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Originally Posted by kailoma679
I think my bearing clearances are: Mains @ .003, Rods @ .003, top ring @ .018, bottom ring @.022, piston to wall clearance .0035

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"
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Old Jun 14, 2019, 04:35 PM
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Originally Posted by Pal215
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
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Old Jun 17, 2019, 11:07 AM
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Originally Posted by letsgetthisdone
That was 7yrs ago. That motor either lasted, or it (probably) didn't...lmao
Gotta love these old threads.
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