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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Modern Fuel & Ignition Advance
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<blockquote data-quote="Deleted member 3831" data-source="post: 94850"><p>Combustion is a complicated subject, hardly possible to describe it adequately in a forum, however long the post. However, a couple of features might be worth mentioning as worthy of consideration and thus encourage further comment.</p><p>Effective combustion will result from the peak cylinder pressure occurring somewhere between 10 and 15 degrees ATDC on the firing stroke, (average 12.5 degrees), despite the crank not realising it's position to transmit maximum torque until it has moved to approx. 76 degrees ATDC.</p><p>From the initial spark at the plug, there is a delay period during which the tiny burn is struggling to take hold, rather as a bonfire would if started from a single match. This delay period is usually considered to be in the region of 10 degrees.</p><p>If your starting point is 38 degrees BTDC, the effective burn period will be approx 28 plus 12.5, say 40.5 degrees. Convert 40.5 to milli seconds at the engine speed where max. torque is produced and you will see it is a remarkably short time. At peak power rpm, time gets shorter still.</p><p>Now try fitting flame speeds into this and see where it gets to, allowing for the distance of travel being longer on the side of the piston opposite the plug.</p></blockquote><p></p>
[QUOTE="Deleted member 3831, post: 94850"] Combustion is a complicated subject, hardly possible to describe it adequately in a forum, however long the post. However, a couple of features might be worth mentioning as worthy of consideration and thus encourage further comment. Effective combustion will result from the peak cylinder pressure occurring somewhere between 10 and 15 degrees ATDC on the firing stroke, (average 12.5 degrees), despite the crank not realising it's position to transmit maximum torque until it has moved to approx. 76 degrees ATDC. From the initial spark at the plug, there is a delay period during which the tiny burn is struggling to take hold, rather as a bonfire would if started from a single match. This delay period is usually considered to be in the region of 10 degrees. If your starting point is 38 degrees BTDC, the effective burn period will be approx 28 plus 12.5, say 40.5 degrees. Convert 40.5 to milli seconds at the engine speed where max. torque is produced and you will see it is a remarkably short time. At peak power rpm, time gets shorter still. Now try fitting flame speeds into this and see where it gets to, allowing for the distance of travel being longer on the side of the piston opposite the plug. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Modern Fuel & Ignition Advance
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