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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Squish
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<blockquote data-quote="Nigel Spaxman" data-source="post: 165442" data-attributes="member: 2907"><p>I think that if your engine is only 8:1 you won't need any squish. My Rapide is about 8:1 (I have never measured it, but I have 8:1 pistons) and it has the top of the barrel chamfered as many people do, mainly so that the intake valve is not shrouded by the edge of the barrel. The top of the chamfer is about the same diameter as the recess in the head. There really can't be any squish at all but my bike runs really well. (It is fast too) My bike never seems to have any pinging or pre ignition, even when you try to force it by lugging it etc. Somehow the turbulence in the huge open combustion chamber must be enough. I have two front heads, I wonder if that really does improve the swirl as some people think. I have used different ignition settings 38 and 34 degrees, it doesn't seem to make much difference, my engine won't ping. I think that if it isn't pinging then it doesn't need more squish. With the standard bore, because the bottom of the hemisphere is more than 84mm there really is no way to get any squish without a lot of welding. It seems wrong that the head is bigger than the bore, but somehow it works.</p></blockquote><p></p>
[QUOTE="Nigel Spaxman, post: 165442, member: 2907"] I think that if your engine is only 8:1 you won't need any squish. My Rapide is about 8:1 (I have never measured it, but I have 8:1 pistons) and it has the top of the barrel chamfered as many people do, mainly so that the intake valve is not shrouded by the edge of the barrel. The top of the chamfer is about the same diameter as the recess in the head. There really can't be any squish at all but my bike runs really well. (It is fast too) My bike never seems to have any pinging or pre ignition, even when you try to force it by lugging it etc. Somehow the turbulence in the huge open combustion chamber must be enough. I have two front heads, I wonder if that really does improve the swirl as some people think. I have used different ignition settings 38 and 34 degrees, it doesn't seem to make much difference, my engine won't ping. I think that if it isn't pinging then it doesn't need more squish. With the standard bore, because the bottom of the hemisphere is more than 84mm there really is no way to get any squish without a lot of welding. It seems wrong that the head is bigger than the bore, but somehow it works. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Squish
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