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Ring end gap too big, should I ride it?
Posted: May 15th, 2016, 11:53 am
by truthseeker
I have a new wiseco forged piston 89.50 and I measured the ring end gap and it was .031"
The specs for Honda say .011 to .020"
Is it different since it is a forged piston?
I need to throw this back together so I can ride tomorrow!
Help!!
Posted: May 16th, 2016, 12:11 pm
by Kuma
Too little ring gap is a problem, too much, not so much, piston to cylinder clearance good?
Maybe Roosty will chime in.
Posted: May 17th, 2016, 7:44 am
by Sandblaster
A lot of testing has been done on this.
Your right... Too little... Major issue.
To much??? Not so much.
I'd like to see it a bit better then yours but I have certainly seen a lot worse..
A VERY GENERAL rule of thumb is .004-.005" per one inch of bore for normally aspirated engines. .006-.007" per one inch of bore for boosted applications.
89.5mm x .03937 x .004" = .014" ring end gap or whatever..
Posted: May 17th, 2016, 9:41 am
by Roostius_Maximus
I go .018" on the skinny side for standard setups
bridgeless cylinders i go .022
have run them up to .026 or .028", i forget, made no difference really
Posted: May 18th, 2016, 10:15 am
by truthseeker
Called wiseco yesterday (Tuesday) and they said they will be fine.
Good thing, cause Monday I "broke it in" up in the mountains!
Posted: May 31st, 2016, 9:52 am
by scooter5002
Seems to me, when I had my motor apart at Roosty's shop, mine gapped at 50 thou. I slapped that bitch together and rode it, long and hard.