Joined Dec 2003
587 Posts | 2+
Where ever we park the motorhome, USA
Dale,
I am curious as to why 4 stroke motorcycle engines use what is basically a 2 stroke ignition? In automobiles, the ignition only sends a spark on the compression stroke. In motorcycles, we get a spark every revolution of the crank. So we get a spark during the intake cycle, since the intake valve opens prior to TDC on the exhaust stroke. Does that not affect the performance potential of the incoming charge? At the very least, it reduces the time available to build up energy and thus results in a reduced amount of energy available for the spark (compared to a system that would provide spark every other revolution). I'm curious as to your thoughts on the subject. I'm sure that you have considered this in your years of engine building.
Why not produce a system that incorporates a trigger on the cam gear? A magnet and a pick-up sensor would be easy to incorporate in the ignition.
I am curious as to why 4 stroke motorcycle engines use what is basically a 2 stroke ignition? In automobiles, the ignition only sends a spark on the compression stroke. In motorcycles, we get a spark every revolution of the crank. So we get a spark during the intake cycle, since the intake valve opens prior to TDC on the exhaust stroke. Does that not affect the performance potential of the incoming charge? At the very least, it reduces the time available to build up energy and thus results in a reduced amount of energy available for the spark (compared to a system that would provide spark every other revolution). I'm curious as to your thoughts on the subject. I'm sure that you have considered this in your years of engine building.
Why not produce a system that incorporates a trigger on the cam gear? A magnet and a pick-up sensor would be easy to incorporate in the ignition.
