Re: john deere

Posted by G/MAN on January 10, 2006 at 15:33:13 from (67.52.48.10):

In Reply to: Re: john deere posted by old on January 09, 2006 at 19:37:43:

As the others have said, you're incorrect. Your "B" is throttle-governed, meaning that each cylinder will fire once during each 720-degrees of crankshaft rotation, just like any other 4-stroke engine, be it a four-cylinder, six-cylinder, V-8, etc. The "hit-and-miss" sound comes from the firing order of the engine, which has cylinder #1 firing, followed by cylinder #2 180 crankshaft degrees later, which is followed by 540 degrees of "coasting", during which cylinder #2 completes its power-stroke, exhaust stroke, and #1 completes its exhaust stroke and intake stroke. And of course single-barrel-carbureted two-bangers often tend to miss on the #2 cylinder at low idle speeds because for the same reason - cylinder #1 gets the bulk of the fuel-air charge, and #2 can get starved enough for fuel and air that it fires very softly or not at all. This situation goes away as engine speed increases and the carburetor comes out of the idle circuit, which gives the two cylinders much more equal fuel-air charges. So no, your "B" is not a "hit-and-miss" engine, and neither is any other two-cylinder Deere engine, regardless of vintate or how it runs and sounds.

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