H Distributor advance?

Anonymous-0 · Jul 13, 2010

Will a Distributor off of a 350 work on a 1943 H? is the mechanical advance the same? Thanks!

Nebraska Cowman · Jul 14, 2010

Sure, it will work for what you want. There were some different configs with springs & shaft but who knows, maybe the distributor you are getting off a 350 came off an H?

Jim Becker · Jul 14, 2010

Each distributor has a version and date code stamped into the lower flange of the distributor housing. It may be partly obscured by the mounting clamp (where you rotate it to adjust timing). This will tell you which version you ar looking at, unless somebody has changed internal parts without changing the markings. The code for an H is the letter A. I'd have to go find the code for a 350, which is probably listed in the parts catalog.

NDS · Jul 14, 2010

It will work advance may be different BUT if you go to parts book they give generic distibutor (353870R91) for all applications on both H and 300. Some say you must have exact curve and that may be so if you are after that last 1/2 HP but many of these old tractor did hard work for years with magnetos and magneto does not have centrifical advance.

pete 23 · Jul 14, 2010

Compression ratio, engine rpm and octane of fuel determine correct ignition advance. If it is over advanced it will detonate, under advanced lack of power or laboring, 350 used a 22 degree advance, H , gas head, flat over bore aluminum pistons used 30 degrees. Lot of 40 degree distributors around, they were intended for the cast iron original bore H and M. They work fine on most with aluminum flat head. The next thing is , when does it advance. If springs and weights are not in good shape it will over advance at low speeds and you have a ragged running engine. A magneto has a fixed advance, impulse coupling is used to retard spark for starting and once running full advanced, most are 35 degrees. Lot of ragged running engines with magnetos at lower rpm. Run fine full throttle. Not that hard to take a peek inside dist to tell what condition it is in and what advance you have as it is stamped on weight retainer portion of shaft. I'll add, most any fire crater piston with gasoline head is speced out to 22 degree advance. Exception would be like a 400 or 450 which had a 25 degree and IH figured that was close enough.

H Distributor advance?

Anonymous-0

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Nebraska Cowman

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Jim Becker

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NDS

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pete 23

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