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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Muff to Crankcase shims and gaskets
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<blockquote data-quote="davidd" data-source="post: 32218" data-attributes="member: 1177"><p>Vince998,</p><p></p><p>The net combustion chamber volume is measured with the head off, a plexi glass flat pressed to the sealing surface with some light grease and a hole drilled in the edge of the plexi and positioned at a high spot. The plugs to be used are installed and fluid from a burrette is poured in the hole. This gives you a good idea of the net combustion chamber volume. Additionally, the piston dome volume has to be calculated. Some tuners have a selection of indexing washers for the plugs so they can be positioned for height and electrode position in the chamber.</p><p></p><p>Most of the discussion has been about the mechanical compression ratio, which can be much higher than the effective compression ratio, ie. when the engine is running.</p><p></p><p>David</p></blockquote><p></p>
[QUOTE="davidd, post: 32218, member: 1177"] Vince998, The net combustion chamber volume is measured with the head off, a plexi glass flat pressed to the sealing surface with some light grease and a hole drilled in the edge of the plexi and positioned at a high spot. The plugs to be used are installed and fluid from a burrette is poured in the hole. This gives you a good idea of the net combustion chamber volume. Additionally, the piston dome volume has to be calculated. Some tuners have a selection of indexing washers for the plugs so they can be positioned for height and electrode position in the chamber. Most of the discussion has been about the mechanical compression ratio, which can be much higher than the effective compression ratio, ie. when the engine is running. David [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Muff to Crankcase shims and gaskets
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