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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Which side for the sparkplug?
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<blockquote data-quote="Tom Gaynor" data-source="post: 24126" data-attributes="member: 4034"><p>My first Manx Norton head, which had come from Joe Potts' "lab" at Bellshill, had had twin plugs. The extra plug 'ole had later been welded up. Draw your own conclusions. There might be an advantage if the head is ill-designed, and leaves a pocket of unburned gas, but by the fifties the advantages of "swirl" were well accepted, and gas was "injected" into the periphery of the combustion chamber "at a tangent" past the plug, so that it would sweep right round a full circle, then exit via the exhaust port.</p><p>My single plug 86 bore Manx clocked 146 mph at Chimay. Since you ask, it was positively orgasmic. </p><p>Amazing how many 60 bhp (at the back wheel...) Manx Norton classic racing 90 or 92 bore rocket-ships, faster than mine (a measly 52 bhp atbw), DO NOT have twin plugs. Maybe the builders know something.</p></blockquote><p></p>
[QUOTE="Tom Gaynor, post: 24126, member: 4034"] My first Manx Norton head, which had come from Joe Potts' "lab" at Bellshill, had had twin plugs. The extra plug 'ole had later been welded up. Draw your own conclusions. There might be an advantage if the head is ill-designed, and leaves a pocket of unburned gas, but by the fifties the advantages of "swirl" were well accepted, and gas was "injected" into the periphery of the combustion chamber "at a tangent" past the plug, so that it would sweep right round a full circle, then exit via the exhaust port. My single plug 86 bore Manx clocked 146 mph at Chimay. Since you ask, it was positively orgasmic. Amazing how many 60 bhp (at the back wheel...) Manx Norton classic racing 90 or 92 bore rocket-ships, faster than mine (a measly 52 bhp atbw), DO NOT have twin plugs. Maybe the builders know something. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Which side for the sparkplug?
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