You can de-rate any engine to produce a lower than potential chosen HP.
At times this has merit as the longevity is increased.
Unfortunately running an engine at such a reduced efficiency will cost you dearly in fuel consumption.
Gas engines typically reach peak HP at higher rpm than diesel engines so all you are doing is holding it back from it's potential and wasting fuel.
The 8.1 Vortec in my dually for example makes about 150 HP at 2000 rpm by the time it reaches 4000 rpm it peaks around 340 HP properly geared and utilized it makes a lot more sense to use the power it can dependably make instead of governing it at 150 HP.
Limiting factor on a tractor is being able to use the same transmission and gearing for gas or diesel and still maintain a 540 or 1000 rpm at the PTO.
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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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