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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Twin e-starter options?
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<blockquote data-quote="greg brillus" data-source="post: 123627" data-attributes="member: 597"><p>When discussing this topic with Ken Horner he and I both agreed that the less number of cylinders on an engine the harder it is for an electric starter........But a big "V" twin is particularly bad because the power pulses are close together and this makes the engine similar to a giant single. By opening the throttle you instantly increase the volumetric efficiency of the engine, so this makes cranking very difficult.........Mac has made the most valid of points that most makes of modern bike engines do in fact use some form of decompressor in their valve train, usually some centrifugal weighted device that throws out upon engine start to regain full compression on that cylinder. The large capacity Harley/ S&S engines use a solenoid in the head.........On Terry's newer top end kits they have prevision for one of these solenoid valves to screw into a 12 mm thread with a tiny hole that passes through into the combustion chamber between the two valve seats......This seems to work quite well, i installed one of these kits on a Comet a couple of years back, and chose to use a horn button on the left side handle bar as a compression release........It worked very well for turning the engine just over TDC for starting, although it wan't quite big enough to effectively stop the engine like a stock valve lifter, but it had coil ignition anyway so that needed to be switched off to kill the engine.</p></blockquote><p></p>
[QUOTE="greg brillus, post: 123627, member: 597"] When discussing this topic with Ken Horner he and I both agreed that the less number of cylinders on an engine the harder it is for an electric starter........But a big "V" twin is particularly bad because the power pulses are close together and this makes the engine similar to a giant single. By opening the throttle you instantly increase the volumetric efficiency of the engine, so this makes cranking very difficult.........Mac has made the most valid of points that most makes of modern bike engines do in fact use some form of decompressor in their valve train, usually some centrifugal weighted device that throws out upon engine start to regain full compression on that cylinder. The large capacity Harley/ S&S engines use a solenoid in the head.........On Terry's newer top end kits they have prevision for one of these solenoid valves to screw into a 12 mm thread with a tiny hole that passes through into the combustion chamber between the two valve seats......This seems to work quite well, i installed one of these kits on a Comet a couple of years back, and chose to use a horn button on the left side handle bar as a compression release........It worked very well for turning the engine just over TDC for starting, although it wan't quite big enough to effectively stop the engine like a stock valve lifter, but it had coil ignition anyway so that needed to be switched off to kill the engine. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Twin e-starter options?
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