If the trucking industry had a demand for gas engines, they would probably outperform the diesels when it comes to horsepower and torque. It has always been like that and probably always will be. But there is little demand for HD gas engines. That might change with all the emissions regs and prices differences between LNG, gasoline, and diesel.
Several companies are now offering Cummins ISX engines for big rigs that run on natural gas (not gasoline). They are making just as much power as their equal sized diesel versions.
One example is the Westport 915 cubic inch Cummins run on natural gas.
Wesport HD475 natural gas engine – 467 horse at 1400 RPM and 486 horse at 1600 RPM. 1750 lbs. torque at 1200 RPM.
If GM decided they wanted to make a gas engine built as HD as the Isuzu-Duramax, with same bore and stroke, same turbo boost, etc. it would perform just as well if not better on gasoline. It would just be a pig on fuel mileage and there is no demand for such an engine.
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Today's Featured Article - The Day Mom Drove the 8N - by Brian Browning. My Dad was wanting to put in a garden but couldn't operate the 8N and handle the old horse drawn plow he had found and rigged up to use with the tractor. Well, he decided to go get Mom out of the house and have her drive the tractor while he walked behind the plow. You got to understand that while my Mom is a hard worker who will always help whenever she can... she had never operated farm machinery before that day. Dad got her out there, explained how the clutch was the same as in our o
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