Darryl.Richman's picture



Pat Tobin's picture

Hey Superman,

If I had an engine which may have run OK in slow cruising around home, but starts breaking pistons when called upon to do hours-on-end at near full-throttle speeds, one of the first things I would check would be max ignition advance. If I'm not mistaken, typical push-water in the '20s and '30s was so mild that huge ultimate advance could be tolerated.

I would guess you might find ultimate advance well North of 30 degrees. For today's gas, I would suggest not exceeding 20 degrees max. Just an educated guess; those with more experience running ancient engines this hard would certainly have more experienced opinions on the matter.

Suffice it to say that pre-ignition or detonation or both will drastically increase flame temperature. Most of the problems you have suffered could be explained by excess combustion temps.

You have my full admiration, Bro,

Pat Tobin

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