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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Squish Clearance / Deck Height
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<blockquote data-quote="timetraveller" data-source="post: 43116" data-attributes="member: 456"><p>It is good to make the squish band clearance the smallest that one can BUT make it too small and any slop in the big or small ends or stretch of the conrod at high revs can lead the piston the hit the cyclinder head and too large and it does not work. Any figure on our engines larger than sixty thou would be useless and any figure much less than thirty thou would be potentially dangerous. However, if Big Sid has managed to regularly use twenty thou with no problems then I would alway accept someone elses experimental results. Twenty thou is not going to let you get away with much stretch in the conrod or clearance on the big and small ends but if BS can get away with it then maybe that is possible.</p><p>It is worth while to consider what the squish band is meant to do. It is intended to create a lot of turbulence in the cylinder just prior to the start of the ignition and combustion. This in turn means less chance of small pockets of mixture prematurely igniting or burning too rich or too weak. It also helps the flame front to move rapidly across the combustion chamber and to ensure as complete a combustion of the whole charge as is possible.</p><p>Perhaps I should also have added that the squish band is normally positioned so that the 'squished' charge is aimed towards the spark plug so that the ignition process starts where the maximum turbulence is.</p></blockquote><p></p>
[QUOTE="timetraveller, post: 43116, member: 456"] It is good to make the squish band clearance the smallest that one can BUT make it too small and any slop in the big or small ends or stretch of the conrod at high revs can lead the piston the hit the cyclinder head and too large and it does not work. Any figure on our engines larger than sixty thou would be useless and any figure much less than thirty thou would be potentially dangerous. However, if Big Sid has managed to regularly use twenty thou with no problems then I would alway accept someone elses experimental results. Twenty thou is not going to let you get away with much stretch in the conrod or clearance on the big and small ends but if BS can get away with it then maybe that is possible. It is worth while to consider what the squish band is meant to do. It is intended to create a lot of turbulence in the cylinder just prior to the start of the ignition and combustion. This in turn means less chance of small pockets of mixture prematurely igniting or burning too rich or too weak. It also helps the flame front to move rapidly across the combustion chamber and to ensure as complete a combustion of the whole charge as is possible. Perhaps I should also have added that the squish band is normally positioned so that the 'squished' charge is aimed towards the spark plug so that the ignition process starts where the maximum turbulence is. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Squish Clearance / Deck Height
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