The Cummins was a six cylinder naturally aspirated (no turbo-charger) 5.9 litre diesel that theoretically put out 120 horse power (HP) at 2800 RPM. (I say “theoretically”, because we suspect that it never did develop its specified horse power or torque due to the blow-by problem.) It swung a 21 inch MaxProp through a Velvet Drive 72 transmission with 1.88:1 reduction gear.
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