No idea Isuzu made NPR gas trucks...

We had an NPR at work once that was gas. It was a good one. We had another NPR that was diesel. Twas a turd

The gas ones drink fuel like there's no tomorrow but are otherwise pretty reliable.

I build a lot of 6L90E's & 4L80E's for the older ones, 100,000 to 150,000 is all you can expect out of one before an overhaul
 
I've only driven an NPR once. It was one of those old ones with the 3.9l diesel. I can't say how strongly the engine pulled as the transmission was going out and it seemed like it was skipping second gear.
 
That reminds me of the older trucks with detroit diesels in the them. We have one powering our fire pump.
The 2 stroke DDs with the blowers are not technically supercharged. The blower only provides for fresh air evacuation of the cylinder before the fuel is injected. There is no boost to the combustion process provided per se, because while the ports are exposed on the cylinder liner, the exhaust valves are also open to evacuate the exhaust gases from the cylinder. These engines are considered natually aspirated, even though they have a blower on top. The engine will not run at all without the blower.

A lot of the later ones had turbos, to provide for usable boost that the ones with only the blower didn't have.

Before anyone tells me this is semantics, no it is not. The blower on non-turbo DDs does not provide boost and it is an error to call them supercharged.
 
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