Piston ring end gaps.

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4v6
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Joined: March 20th, 2007, 1:20 pm
Location: Midlands UK (A)
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Piston ring end gaps.

Post by 4v6 »

Good morning Guy, I hope you're well.

My question concerns the piston ring end gaps necessary on a turbo application for an engine I'm putting together.

The pistons are Wossner items, sized at 81.43mm to fit bore size 81.50mm, so giving a running clearance of 0.07mm.
The manufacturer states a range of multiplication factors for the various applications for the supplied rings, the turbo/nitrous application being 0.006 multiplied by the bore.
So in my case the minimum end gap I can run would appear to be (for both top and second rings) 0.489mm.
Oil rings are quoted as minimum end gap of 0.381mm.
Do you have a recommendation as to what gap I should aim for?
Its something I'm tending to obsess about, worrying that theyll be too tight/wide, obviously I want this to be right before I get to assembly stage.
Any help you can provide as always gratefully appreciated.

Best wishes, Tony.
Tony Warren. GC #96.
Guy Croft
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Re: Piston ring end gaps.

Post by Guy Croft »

Top ring 12-16 thou

Second ring 18-20 thou

G
Guy Croft, owner
4v6
Posts: 205
Joined: March 20th, 2007, 1:20 pm
Location: Midlands UK (A)
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Re: Piston ring end gaps.

Post by 4v6 »

Thank you very much Guy, thats brilliant!

Ill get these done shortly and at least I can then sleep without waking myself up with worry.

Thanks very much again.
Best wishes, Tony.
Tony Warren. GC #96.
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