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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Measuring Compression Ratio
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<blockquote data-quote="vibrac" data-source="post: 41858" data-attributes="member: 60"><p>I always use play dough. mould about 80cc in your hand plonk it on the piston, put the head with valves in place hold down with a couple of head nuts (take the spark plug/s out!) turn the engine over watch the snakes come out of the plug holes lift the head (you can check the clearances now if you are worried) peel out the dough in the dome allowing for volume inside where the plugs would go roll it into a nice ball (I knew play school had a purpose) fill up a burette with water to a measured line pop in ball read off cc</p><p>of course to get the right ratio its easier to use compression plates than pistons I make up an Excel spread sheet and just read it off</p></blockquote><p></p>
[QUOTE="vibrac, post: 41858, member: 60"] I always use play dough. mould about 80cc in your hand plonk it on the piston, put the head with valves in place hold down with a couple of head nuts (take the spark plug/s out!) turn the engine over watch the snakes come out of the plug holes lift the head (you can check the clearances now if you are worried) peel out the dough in the dome allowing for volume inside where the plugs would go roll it into a nice ball (I knew play school had a purpose) fill up a burette with water to a measured line pop in ball read off cc of course to get the right ratio its easier to use compression plates than pistons I make up an Excel spread sheet and just read it off [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Measuring Compression Ratio
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