Ram Eco-Diesel vs F150 2.7 TT - Davis Dam
You just know it's not gonna be close! So which is better? Horsepower or torque lol. (The answer is both, apparently.)
Forum Discussion
I've trailered with gas and with diesel. Diesel should see about 30% more mpg, under equal conditions. Part of it is that diesel fuel is about 129,000 ,BTU's per gallon, and gas is 110,000 BTU's per gallon. The other is that due to the nature of the way the fuel burns, in diesel, versus explodes at ignition with a single ignition time with gas, the efficiency goes to diesel when running on any type of otto cycle powered engine. Diesel injectors now have multiple fuel injections /ignition points, as the fuel is injected and burned at various portions of the cylinder stroke, to accomodate the way the diesel fuel burns.
Gas is 43.90 HP/hr per gallon, Diesel is 50.87 HP/hr per gallon.
Diesel engines run at about 60% to 66% of the rpms that gas motors run at, making equal torque, so since the motor is spinning slower, there are also less parasitic losses of energy to the motor, and the transmission also.
The level of torque generated by a diesel is another factor in it's favor, at lower rpms, made possible by the pumping efficiencies of a turbo charger.
Cumulatively, that adds up to about 30%.
Gas is 43.90 HP/hr per gallon, Diesel is 50.87 HP/hr per gallon.
Diesel engines run at about 60% to 66% of the rpms that gas motors run at, making equal torque, so since the motor is spinning slower, there are also less parasitic losses of energy to the motor, and the transmission also.
The level of torque generated by a diesel is another factor in it's favor, at lower rpms, made possible by the pumping efficiencies of a turbo charger.
Cumulatively, that adds up to about 30%.
