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On John Deeres and Harleys
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Posted by Ultradog MN on October 01, 2006 at 17:04:25 from (64.131.43.183):
I was having a brew with a couple of hunting buddys and the subject of engines came up.
One guy has a Harley the other a JD B.
It called to mind a conversation I overheard one time about how each of those engines have such a distinctive sound.
I didn't really have a handle on it but promised to ask the folks on this great board.
There's 720 degrees in a "crankshaft circle" right?
ie only one ignition per two revs/4 strokes of that piston.
If I remember right a JD engine fires its two pistons about 90 degrees apart. So it goes bang,bang and then the engine turns over another 630 degrees while the other 3 cycles occur.
Questions:
How many degrees between is there between those two ignitions/explosions in an old JD B and how many is it in a Harley?
I am thinking they may be timed similarly arent they?
Would be nice to baffel my buddies with a little true BS the next time.
Thanks
Jerry
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