Posted by The Dukester on October 24, 2016 at 09:17:48 from (204.106.241.43):
In Reply to: Re: 2 cyl wisc posted by Moresmoke on October 24, 2016 at 07:24:59:
In a 4 cycle engine where the pistons fire 180 degrees apart the pistons are on opposite throws of the crank 180 degrees apart. Number 1 fires at or near TDC then the crank rotates 180 degrees and number 2 fires at it's TDC, then the crank rotates 540 degrees before number 1 fires again. This is known as "staccato" firing order....like John Deere 2 cylinder engines operate. Two cylinder 4 cycle engines with both pistons on the same crankshaft throw that fire on alternate 360 revolutions of the crank similar to British 2 cylinder motorcycles and the early 30-60 model E Rumely tractors are "alternate" firing 2 cylinder engines. The alternate firing engines run smoother than the staccato,firing engines, but require substantial counterweights on the crankshaft to offset the imbalance of both piston/rod assemblies being on the same single throw of the crankshaft. The trade off is the staccato firing engines usually require a larger flywheel to dampen the pulses of such an uneven firing order. The exhaust note is different.....John Deeres p-putt, huff, huff, p-putt, huff, huff, the even firing engines putt, hutf, putt, huff when idling slowly. (I think I got this right).
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