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Farmall & IHC Tractors Discussion Forum
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Meanwhile, Back at the Old Thread

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A. Bohemian

04-14-2007 08:28:01




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John, I just this morning got a chance to finish the thread which rolled off the page yesterday. I think you were replying more or less to me when you wrote the following:

Quote: "I got to thinkin I agree with your notion in a way, its just that when you say 35 RETARD I think you meant she retards 35 BEHIND the run time advance NOT that she ever fires 35 AFTER TDC sooooo ooo lateeeee eeee, which is far to slow to ever start fer sure, although she could run poorly I reckon??"

Yes, that is what I meant, but not what I said. Thirty five degrees after TDC is very, very retarded indeed!

What concerns me, though, is that I am fairly certain that SOMETHING must be timed so that at hand cranking speeds, the spark must occur well past top dead center for safety reasons.

Ah, but what is "well past?" I don"t have a clue; but maybe say six or seven degrees?

Remember, with a centrifugal or other mechanical advance, the timing would only be this retarded for the FIRST cylinder to fire, and would come quickly up to where it needed to be, at or before top dead center (but not by much, since we are usually starting at fast idle-type speeds).

But pity the poor lone Model T driver in cold weather, who must sprint back to the driver"s side of the car and yank down on the spark before she dies...

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John T

04-15-2007 08:06:00




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 Re: Meanwhile, Back at the Old Thread in reply to A. Bohemian, 04-14-2007 08:28:01  
Hi there again AB, were still havin a fun discussion fer as Im concerned. Stilllll ll as far as I know on other models, but for dern sure on the Wicos, theres ONLY one adjustment/setting for the Impulse start time. On the Wico its set by adjusting the stop plate which determines when the impulse engages the spring winder upper (cuz the engage dogs arent sucked back in by centrifugal force at 250 RPM) plus the rotational adjustent of the mag itself.

I SURE AGREE its dangerous for them to fire BEFORE TDC at cranking buttttt tttt on the Wico at least theres only one adjustment n one option to set that (but 2 ways it can be adjusted)

The Wicos at least have NOOOOO sort of RPM dependant centrifugal advance curve, itsd EITHER start or run.

Again, I DONT KNOW BEANS ABOUT IHC MAGS buttttt ttttt still pretty sure they are the same as far as having ONLY a start n run time with no in between and one simply has to NOT set em to fire BTDC or risk an injury.

Im at O Hare Airport waitin for the daughter, see yall later tonight.

Take care AB, I really enjoy this sparky chat

John T

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