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Tippy Tippy is online now
Chain fence eating turbo
 
Join Date: Dec 2008
Location: Austin, TX
Posts: 9,212
Ring gap for boost

I'm fairly confident I didn't gap my rings enough the 1st time I rebuilt my engine (3.4 based 3.2) and tore up the Nikasil.

Boost is pretty addicting to me and I live in central Texas where temps get over 100 degrees - I'm leaning on a healthy gap this time.....

What gap would you guys do?

Per Wiseco, they are stating (for boosted race motors) around 0.006" times a 4.000" bore resulting in 0.024" total gap. I have 98mm/3.858" cylinders so should be close to this gap.

Another site is stating around 0.007-0.008" per inch of bore for E85 and high boost. That would be 0.027" to 0.031"

What would you do?

I rather go loose and have a tad more blowby than ever butt ends of the rings!!!

TIA
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Cory - turbo'd '87 C3.2 Guards/Blk, 3.4, 7.5:1 CR, 993SS cams, Borg-Warner S366 turbo @ 1.2-1.5 bar, Treadstone full bay IC, 70mm TB, TiAL F46 WG, HKS 1 1/2" BOV, twin 044 pumps, MicroSquirt AMP'd w/GM smart coilpack, Bilstein coilovers, Tramont replica Speedlines (285's rr, 225's frt), Big Reds frt, 993 rr., tower brace, MOMO wheel
Old 07-12-2021, 11:41 AM
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