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parallel twin firing order?

technofarmer
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technofarmer Contributor

technofarmer

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  Something i have wondered for years is about the firing order of a parallel twin.  Yes i am aware of both pistons going the same direction at the same time, but do both cylinders fire at the same time or at different times? Just being curious since i have always wondered.  

Frank Angerano Grand Master

Frank Angerano

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Parallel twins don't fire at the same time. While one piston is on the way up to fire the other is on the way down.  They are designed like this so there is a constant velocity power band and produce a lot more torque. 

Tandem twins have the pistons firing at the same time as the pistons are at the same location on the crank shaft.  These are a pain in the as* to dial in since the air/fuel delivery to the cylinders has to be very close because they both fire together.    

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