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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Piston ring gap
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<blockquote data-quote="Chris Launders" data-source="post: 101272" data-attributes="member: 2010"><p>I have a small query here, has anyone had trouble with the ring gap on their club piston rings. </p><p></p><p>I've recently got a +20 piston and had a barrel bored and unfortunately it was done slightly oversize, it has 7 thou clearance, when I tried the rings there was a 30 thou gap, which I thought was excessive and as the club was out of stock of + 20 rings contacted Omega who sent me another set, exactly the same. </p><p></p><p>Now my maths suggests that these rings have a 10 thou gap at ZERO running clearance so if you introduce say a 3 thou running clearance you will already have a 20 thou piston ring gap. Does this seem right.</p><p></p><p>By the way the person I spoke to and explained my predicament said that with running a 7 thou clearance I ran a chance of there being so much piston slap it could shatter the skirt and I ought to have it bored to +40.</p><p></p><p>This piston by the way is not running in a Vincent but a JAP V-twin with an iron barrel, about 4500 rpm max and total loss 50w oil so I don't expect that much piston slap and really don't want to bore it again.</p></blockquote><p></p>
[QUOTE="Chris Launders, post: 101272, member: 2010"] I have a small query here, has anyone had trouble with the ring gap on their club piston rings. I've recently got a +20 piston and had a barrel bored and unfortunately it was done slightly oversize, it has 7 thou clearance, when I tried the rings there was a 30 thou gap, which I thought was excessive and as the club was out of stock of + 20 rings contacted Omega who sent me another set, exactly the same. Now my maths suggests that these rings have a 10 thou gap at ZERO running clearance so if you introduce say a 3 thou running clearance you will already have a 20 thou piston ring gap. Does this seem right. By the way the person I spoke to and explained my predicament said that with running a 7 thou clearance I ran a chance of there being so much piston slap it could shatter the skirt and I ought to have it bored to +40. This piston by the way is not running in a Vincent but a JAP V-twin with an iron barrel, about 4500 rpm max and total loss 50w oil so I don't expect that much piston slap and really don't want to bore it again. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Piston ring gap
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