The Cummins soon to take on the Ike
Time to place our bets; I still haven't decided whether the Duramax did lousy or if the Ford is an over achiever. Ignoring the performance of the Duramax I'm going to say the Cummins will do the ru...
Forum Discussion
wilber1 wrote:
The last Cummins to have a flat torque curve was the 350 HP 650 LB/FT. in early 2011
It reached 650 lbft at 1600 RPM and stayed flat until peak power at 2800 RPM
The 350/800 engine reached 800 lbft at 1600 RPM but gradually decreased until it was the same as the 650 engine at 2800 RPM. If it was still making 800 lb ft it would be putting out 426 HP, not 350.
If the Cummons 900 engine was still making 900 lb ft at 2800 RPM it would be putting out 480 HP, not 385.
If you read his post again, it's flat *power* curve, not torque curve.
A falling torque curve is desirable in a heavy duty motor, because as you lug down the revs in a gear, you get torque rise, thus fairly constant power.
The Cummins loses less power at lower rpm than the Duramax, and thus won't need 10 speeds nearly as much.
