> Obviously the people that design engines think so. For example, compare a John Deere 1020 rated at 39 max horsepower, gas or diesel. Gas engine with 7.5 to 1 CR only has three main bearings and the rod-journals are 2.3". Diesel version with 16.3 to 1 CR has four main bearings and rod-journals are 2.75".
Diesel and gas engines are apples and oranges. The combustion pressure curve for a diesel engine will be quite different than for a similar gas engine. The bottom end of the motor has to be sized to handle the PEAK combustion pressure of each cylinder. If the bottom end is sized to handle the combustion force, the compression force will be no big deal.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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