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Dirt Bike Mods & Maintenance
Plugging oil holes in pistons
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[QUOTE="David Trustrum, post: 1192332, member: 21529"] That's weird, I was notified about this post about a week ago & couldn't see it. :think: 84cr500lover has just replied to a thread you have subscribed to entitled - Plugging oil holes in pistons - in the Mods & Performance Forum forum of Dirt Rider . Net Forums. This thread is located at: [url]http://www.dirtrider.net/forums3/showthread.php?t=150925&goto=newpost[/url] Here is the message that has just been posted: *************** The holes do not affect compression at top dead center, the holes are below the rings. Think about it. The holes are there to force some oil onto the bridge on the down stroke. *************** Ahh slightly different. Yes I know won't lose any chamber compression but will lose a little crankcase pressure & charge. Will it make any difference? Probably not much, but who knows? A friend was building an engine that wasn't performing as well as he hoped, turns out he ran a piston that didn't cover the port at top dead centre (skirt was a bit narrow for wide bridged port) & changed piston & it 'came alive'. ok bigger holes in his case, but same scenario, -am I losing a 1/10 of an hp total?- or needlessly giving away 2 or 3 in the midrange? Don't know. Would like to trial it on the dyno. Must send that old piston to friend to weld. [/QUOTE]
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Plugging oil holes in pistons
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