Re: john deere

Posted by RAB on January 09, 2006 at 22:49:02 from (195.93.21.101):

In Reply to: Re: john deere posted by mno on January 09, 2006 at 21:04:25:

That one is simple to answer. The 2 crankpins can only sensibly be adjacent or opposite. Most engines had "360" cranks (adjacent crankpins, and fired at 180 degrees).
Deere had, and retained, the "180" crank as it was better balanced for rotating mass (and those pistons were massive!) but they obviously needed to have the different firing interval and so sounded different.
They probably needed a larger flywheel than the alternative, to even out the power delivery, but had a reliability advantage as crank failure was relatively common in those days.
Honda motorcycles (the CB72 and CB77) had 180 cranks. That was in the "60s. They too, were "different sounders" but those engnes would rev to 10 000 and vibration was much improved over the British motorcycles of that era.
Regards, RAB

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