Here are a few examples of tractor engines with equal sized power ratings in gas and diesel with different sized engines - and also two equal sized in gas and diesel:
Deere 2010 (and 1010 with diesel version) Note that both 145 engines are equal bore and stroke, and the gas has more torque)
145 gas: 39 horse, 114 lbs. torque @ 1500 RPM 145 diesel: 36 horse, 95 lbs. torque @ 1500 RPM 165 diesel: 46 horse, 119 lbs. torque @ 1500 RPM Those are specs published by Waukesha. The gas 426 runs 6.2 to 1 compressoin ratio. Diesel runs 17.5 to 1. Horsepower is stated as "rated horsepower" and torque as "maxium torque - RPM." So the 426 diesel runs a max torque of 259 lb. ft. at 1600 RPM. Gas 426 264 lb. ft. @ 1200 RPM
Mack had a pile of long-stroke gas engines.
707 cubic inch gasoline Mack had 5" bore by 6" stroke. 232 horse @ 2100 RPM and 617 lbs. of torque @ 1200 RPM.
707 cubic inch diesel Mach had 5" bore by 6" stroke. 201 horse @ 2100 RPM and 602 lbs. of torque @ 1500 RPM.
Mack's "little” 464 in gas and diesel:
464 gas engine, 464,cubic inches, 4 7/16" bore by 5" stroke, 185 horse @ 2800 RPM and 380 lbs. torque @ 1400 RPM
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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