The cummins is actually governed at 2800 rpm and that is easily changed, mine will run to 3200 , the governor spring is $20.00
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Originally Posted by Edahall
I've got both a 1982 Suburban 6.2L diesel and a 1990 Suburban that has been retrofitted with a VE pump Cummins so I can talk about both engines. Both engines shine in different ways. The 6.2L gets better fuel economy hands down. I get 30 mpg with the 6.2L but the most I've got with the Cummins is 26 mpg. I've got headers and glasspacks on the 6.2L and it sounds powerful and more menacing than the largest big block V8. And the engine will rev to 3600 rpm's and set off all the car alarms on the side of the street. It's fun to drive and will go over 100 mph and accelerate 0-60 in less than 11 seconds. Parts are relatively inexpensive for the 6.2L and people hate them so complete used engines are easy to come by. However, I know that the bottom end of the block is weak so the bottom end letting go is always on my mind.
The Cummins on the other hand is a slow revving engine governed at 2300 rpms. The engine does not scream like the 6.2L and does not have that menacing V8 growl but it's a lot smoother running engine and it has a lot more pulling power. The big difference is when it comes to pulling a heavy load. It'll easily pull 10k lbs while the 6.2L strains even pulling 5k lbs. The engine also has a lot more usable power in the rpm band that you're using. You just push down on the gas pedal and it takes off even at 1500 rpm's while the 6.2L has to rev similar to a gas engine up to provide power. The engine is also heavily built and is not known for letting go at any second so it gives me much better peace of mind when I'm a long ways from home. So far, both engines have served me well.
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