Posted by jdemaris on January 28, 2011 at 15:51:38 from (67.142.130.13):
In Reply to: HP??? posted by dave2 on January 28, 2011 at 13:32:13:
If you take two engines, with the same bore and stroke, the gas engine will make more horsepower and the same, or more torque at the same RPM.
The diesel always has less unless it's turbocharged.
Note I said with equal bore and stroke, NOT just the same total cubic inches.
The popular misconception about diesels being more "powerful" seems to come from these facts. . .
In the past, most diesels were built for heavy duty use - not for light cars and trucks. So, diesels tended to have longer strokes then gas engines in cars.
On the other hand, many industrial and farm-tractor engines WERE made in gas and diesel versions - with bore and stroke the same. It's easy to read the test specs. The gas engine always has more horsepower and at least equal torque at the same RPMs as the diesels.
Some companies if selling a tractor by a certain power level, just used a smaller gas engine then the diesel version - to make the same horsepower and torque (like a Deere 1020 with a 135 gas or 152 diesel). Same with the 1010, 2010, 2020, 4020, etc.
A few examples of engines with equal bore and stroke that came in gas and diesel:
Hercules made the GO130 and DD130 engines. Case made the 188 in gas and diesel John Deere made the 165 in gas and diesel. Ford made the 172 in gas and diesel Allis Chalmers 262 gas and diesel Continental 157, 193, 260, 277, gas and diesel International Harvester 144 gas and diesel Massey Ferguson 206 gas and diesel Minneapolis Moline 336 and 504 gas and diesel
Even a few car engines . . Oldsmobile 350 gas and diesel Isuzu 1.8 gas and diesel
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