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Re: Re: Re: Why do JD engines go putt-putt?
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Posted by greenbeanman on February 14, 2004 at 09:39:29 from (171.75.205.207):
In Reply to: Re: Re: Why do JD engines go putt-putt? posted by Paul in Mich on February 14, 2004 at 07:34:38:
A 4 cycle engine has each piston firing at 720� of crankshaft turn rather than at 360�. #1 Down piston--Suction or intake.
#2 Up piston--Compression of the fuel air mixture.
#3 Down piston--Firing and the power stroke.
#4 Up piston--The exhaust stroke, and then the cycle repeats. What is being said is that the John Deere two cylinder doesn't fire a piston at the end of each 360� rotation, but fires both cylinders during one 360� rotation. The flywheel then carries the engine until the first piston fires again after a full 720� from when it first fired, the second 180� after that. 0�-180� Intake on #1, exhaust on #2
180-360�Compression on #1, intake on #2
TDC (theory)Firing at 360� #1 piston
360-540� Power stroke on #1, compression on #2
TDC Firing at 540� #2
540-720� Exhaust on #1, power stroke on #2 Geez, I hope I've got that right.
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