IH offered three different compression ratios for the model H.
High compression gasoline 5.9 Combination gasoline-distillate 4.75 Kerosene 4.5
Presumably these three options would have been available for all Letter Series engines.
In the Nebraska Test of the Distillate burning H the fuel had an Octane rating of 37.
For the Gasoline engine Test the Octane rating was 71.
Maximum Belt HP Gasoline: 26.2 Fuel consumption: 0.532 lb per HP hour.
Maximum Belt HP Distillate: 23.31 Fuel consumption: 0.604 lb per HP hour.
At one time I had an H with a kerosene head and ran up quite a few hours burning jet fuel. The manifold heat control valve was set in the mid position (it was seized) and seemed to vaporise the fuel OK. For efficient operation the Owner"s Manual says to keep the pointer of the Heat Indicator at the top end of the green segment. This was easy enough to do under constant load, but when the load varied to any great degree it meant making continual adjustments to the radiator shutters. A real pain !
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