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The injected quantity is based on skinny pedal position, not engine speed. IQ is only limited at maximum engine speed. If you are doing 73 MPH in a stock 1 ton CUCV, the engine is at 3600 RPM and the governor in the injection pump is starting to reduce injected quantity to limit RPM. Likewise...

Turbo or not, 3000 RPM is fine. CUCVs have no intake silencer so it sounds rough, the intake manifold is past its prime so noise is high. What kills the engine is torsional vibration from age hardened dampers. All engines suffer this malady, diesels the most. The worst regime is idle speed...

The 6.2 is perfectly happy turning 3600 RPM as long as the harmonic damper is not age hardened and the air filter isn't clogged. The poor volumetric efficiency and resulting high BSFC are the only reasons to avoid this speed range.

Injection quantity is based on throttle pedal position until engine speed nears 3600 RPM. If the engine is at idle and you floor it, the amount of diesel injected on each cylinder cycle goes from 10 to 55 micrometers, nearly instantly. The reason for the RPM cut out is engine protection. The...

While the throttle pedal indeed varies the injected quantity, normally from 4 to 52 cubic millimeters, the high limit is set by the screw you mentioned. There are two plungers which pump this injected quantity, the length of the stroke is the upper limit. When the screw is tightened, it...