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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
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<blockquote data-quote="timetraveller" data-source="post: 150952" data-attributes="member: 456"><p>So, for the record, my measurement of 103.5ccs was not too far off. Note that on the big port heads the radius of curvature inside the combustion chamber was less than on the normal heads resulting in less volume in the head itself. If we take 103 cc as the volume in the head and 500 ccs as the swept volme then a completely flat piston which did not protrude above the liner would give a CR of 5.8 : 1. It only needs three mm of extra piston top to give the 6.8 : 1 CR of early Rapides without a compression plate.</p></blockquote><p></p>
[QUOTE="timetraveller, post: 150952, member: 456"] So, for the record, my measurement of 103.5ccs was not too far off. Note that on the big port heads the radius of curvature inside the combustion chamber was less than on the normal heads resulting in less volume in the head itself. If we take 103 cc as the volume in the head and 500 ccs as the swept volme then a completely flat piston which did not protrude above the liner would give a CR of 5.8 : 1. It only needs three mm of extra piston top to give the 6.8 : 1 CR of early Rapides without a compression plate. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
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