One other thing I forget to mention. Gas engines have more horsepower then diesels when they are the same size, bore and stroke. Only exception is if the diesel is turbocharged.
Gas engines also have the same torque as long as bore and stroke are the same, and sometimes even if the gas is shorter on stroke.
That's why when farm tractors are sold by horsepower level, the diesel versions have bigger engines to keep up with the smaller gas engines.
Here is one example of many.
John Deere - gas versus diesel used in 1020 farm tractors, 350B crawlers, etc.
Gas is 152 c.i. 3.8" bore by 4.33" stroke 42 SAE horsepower 110 lbs. torque at 1300 RPM
Diesel is 164 c.i. 4.02" bore by 4.33" stroke 42 SAE horsepower 110 lbs. torque at 1300 RPM
Deere gas and diesel in 300 and 1020 wheel tractors, 350 crawlers, etc.: Gas is 135 c.i. 3.87" bore by 3.87" stroke 43 flywheel horsepower 110 lbs. torque at 1400 RPM
Diesel is 152 c.i. 3.87" bore by 4.3" stroke 43 flywheel horsepower 110 lbs. torque at 1400 RPM
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