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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Comet Mongrel
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<blockquote data-quote="eglijim" data-source="post: 91704" data-attributes="member: 441"><p>All I can say is when we ran two otherwise identical 1150 engines on Leon Moss's dyno (in 1998) there was little or no measureable difference in power output. The engine with twin plugs needed 5 degrees less advance than the (my) single plug engine. One of the main reasons we ran twin plugs in the racers in the early days was if one plug fouled the other should keep the pot on the boil til the end of the race. Most of this became pointless when we had pistons ,rings and valve guides which kept the oil out of the combustion chamber. A good thing as I was not looking forward to starting my road bike with the Mellor Motors centre plug mod which by repute needed 100 degrees of advance. Subjective reports from people with bored and stroked race engines suggest that the max advance can come below 25 degrees.</p></blockquote><p></p>
[QUOTE="eglijim, post: 91704, member: 441"] All I can say is when we ran two otherwise identical 1150 engines on Leon Moss's dyno (in 1998) there was little or no measureable difference in power output. The engine with twin plugs needed 5 degrees less advance than the (my) single plug engine. One of the main reasons we ran twin plugs in the racers in the early days was if one plug fouled the other should keep the pot on the boil til the end of the race. Most of this became pointless when we had pistons ,rings and valve guides which kept the oil out of the combustion chamber. A good thing as I was not looking forward to starting my road bike with the Mellor Motors centre plug mod which by repute needed 100 degrees of advance. Subjective reports from people with bored and stroked race engines suggest that the max advance can come below 25 degrees. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Comet Mongrel
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