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Sportster Motorcycle General Discussion and Problems For discussing problems about your Sportster motorcycle that don't fit anywhere else.

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  #101  
Old 19th June 2018
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I'm confused. Two wires go to my coil from a single pickup Dyna S. So this means both fire at the same time. One with valves closed the other with exhaust valve open. So a dual fire would fire only on closed valves alternating cylinders using a split coil. Sounds better to me.
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  #102  
Old 8th November 2018
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General piece of information, radial engines always have an odd number of cylinders. That prevents any two cylinders being in direct opposition at any moment in time. I was taught that many years ago, but have never tried to prove or disprove it as a fact.
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  #103  
Old 8th November 2018
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Quote:
Originally Posted by Pezed View Post
General piece of information, radial engines always have an odd number of cylinders. That prevents any two cylinders being in direct opposition at any moment in time. I was taught that many years ago, but have never tried to prove or disprove it as a fact.
According to Wikipedia:
Four stroke radials have an odd number of cylinders per row, so that a consistent every-other-piston firing order can be maintained, providing smooth operation. For example, on a five cylinder engine the firing order is 1, 3, 5, 2, 4, and back to cylinder 1. Moreover, this always leaves a one piston gap between the piston on its combustion stroke and the piston on compression. The active stroke directly helps compress the next cylinder to fire, making the motion more uniform. If an even number of cylinders were used, an equally timed firing cycle would not be feasible.
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