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 - New Life for an Old Allis - by Tyler Woods. My friend Jon, has an old '39 Allis Chalmers B. He thought it a marginal tractor that had long since served its time. She smoked terribly and never had much power but he couldn't afford another so he was limping along with what he had. Jon's Allis has a small front loader and though it doesn't carry much, it serves his needs. It was the hard starting and low power that made him think it was time to replace the old girl. Jon called me to help him discover why his tractor wouldn't start
... [Read Article]
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