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| Farmall & IHC Tractors Discussion Forum |
Topic: Re: IH Battery Ignition (distrubtor)
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| pete 23
11-05-2012 18:34:59
74.32.238.2
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Spark advance should always be tailored to the
compression ratio of an engine and speed it runs.
Normally you can do comparison to different models
like you said , newer models, and come up with
satisfactory performance. A 35 or 40 degree
advance was for a very low comp engine and when
you increase bore size that changes comp ratio as
you are squeezing more air into same size comb
chamber, then you put in dome pistons further
increasing it. Not a one size fits all. IH
actually made a special impulse coupler for the H4
magneto to accomadate fire crater pistons on the M
and H. Put one in for a guy who would not go to
battery ignitions, about 45-50 years ago.
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