Nonsense. Show me even one example. Here are few to the contrary including the famous Ford IH 7.3 diesel when it was a gasoline engine. Long stroke makes torque as does a lot of turbo-boost. Gas or diesel.
7.3 diesel in Ford trucks was made from the IH MV446 gas engine.
Ford-IH 7.3 diesel (445 cubic inches), no turbo: 185 HP @ 3000 RPM, 360 lbs. max TQ @ 1400 RPM. 4.1" and stroke 4.18"
IH gasoline 7.3 (446 cubic inches), no turbo, 235 net hp at 3600 rpm, 8:1 compression ... 385 lbs. max torque at 2600 RPM, 4.125" bore x 4.18-"stroke
Oldsmobile 5.7 (350) diesel - 120 HP @ 3600 RPM and 222 TQ @ 1900 RPM Oldsmobile 5.7 (350) gas engine - 170 HP@3800 and 275 ft/lbs of torque @ 2000. Both 4” bore X 3.38” stroke
Tractor engines with equal sizes in gas and diesel (same bore and stroke):
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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