Diesel vs gas......................

dfranks wrote:

As for the HP/TQ differences in Gas and diesel they is a quantified difference. A gas engine relies on a spark where a diesel relies on heat which in its nature is much more efficient at creating power.

Sure, but the way in which the power is generated does not make it any stronger or weaker. I suspect you're falling victim to the same thing most people on this forum do: comparing peak numbers. If you want to compare peak numbers, compare torque at the wheels, not at the engine.

We all know a diesel produces more torque at the crankshaft, and that a gasser can run at higher RPMs. But what many don't realize is higher RPMs allow the gasser to take advantage of gear reduction in the transmission which multiplies torque at the wheels. Either way, the torque ends up at the wheels, and how much ends up there is ultimately a function of engine (horse)power, which is the combination of torque and RPM.

dfranks wrote:

I will do some home work to follow up on this. Check on some diesel websites and their dyno postings where typically the torque will be double the HP in diesel engines. Not so with gas engines no matter what their displacement.

Be sure to compare torque and power at the same RPM, not at their respective peaks. If you can show the HP=TQ*RPM/5252 relationship is invalid, you may be eligible for a Nobel Prize in Physics. ;)

-- Rob