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Old 09-22-2021, 09:06 PM   #1
alexosenov
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Member#: 494121
Join Date: Nov 2018
Location: Sofia
Vehicle:
06 Hawk

Default Oversized compression ring on standard bore

Hey, guys!

My builder screwed the ring gap on one if the compression rings like by a lot.........
Bore and piston size : 99.5mm
Luckily or unluckily I have the same brand and model old pistons which are 99.75mm. Can we reuse the compression ring 99.75 on a 99.5 bore and piston?
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Old 09-23-2021, 10:47 AM   #2
xtremewlr
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Member#: 525652
Join Date: Jul 2021
Chapter/Region: SWIC
Location: Tucson, AZ
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2006 STI
WR Blue

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If your engine builder can't answer this question for you, then you need to find a new engine builder.

You have to size down the larger ring to fit your bore size and get the correct gap.
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Old 09-23-2021, 12:54 PM   #3
rtv900
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2016 STI

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That's pretty close
just widening the gap will only work to a point
In theory the ring won't be perfectly round in the wrong bore, but obviously if it's super close it will be so close to round it may not matter

If I were building an engine I certainly wouldn't rig up a ring for a different bore because why do that on such a cheap part
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Old 09-25-2021, 02:27 PM   #4
alexosenov
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Bought new ones. The ring won't be a perfect circle , the gap would need to be bigger aaand worse of all is it will not sit deep enough in the piston skirt .
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Old 09-26-2021, 12:29 PM   #5
silverton
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2001 2.5RS-T
Silver..thorn Metallic

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trying to use the wrong sized rings will most certainly turn your engine in to a hand grenade with the pin pulled. only a matter of time before the piston breaks.
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