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 - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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