[SEL] How big an engine ?

[John Hall]

Since most threshers were pulled by tractors, whatever size tractor was
required should be the same as the size of engine needed, assuming tractor
belt horsepower is the same as engine belt horsepower.

The horsepower needed for a thresher is somewhat dependent on 2other  things
besides size of machine and crop conditions.
  Does it have a blower on it? The one dad has is a very late model IH
machine but does not have a blower but a conveyor instead. Those blowers
really eat up some HP.
 How hard are you feeding it? When loaded these machines were designed to
take bundles touching head to tail on the the feeder, not with 4 foot gaps
between them.

John Hall