Carryfast:
Rob K:
Muckaway:
Rob K:
It’s the torque figure that’s important on diesel engines. The bhp means [zb] all. So long as you stay in the peak torque band and drive sensibly there is no reason for a larger engine to be less economical than a smaller one. It’s when you start thrashing them about and past the peak torque band that they really start scoffing fuel. Once you’re past the peak torque point the power drops off like stone and the engine has no puff left to make you go any faster but of course still scoffs fuel because you’ve got the pedal to the floor. That’s why companies that think they’re saving money (and ultimately fuel) by specing smaller engines end up with higher fuel costs because the drivers are reving the nuts off them to try and make them go faster.This is exactly the case with our FE7s. My Foden’s got less BHP, but from a start, will outpull even our 360 Daf manuals.
That doesn’t make any sense, unless you’ve missed out some other key details?
It’s actually the power figure and at what engine speed max power is produced that’s important.In that comparison it’s big engines which always have the advantage which is why they don’t fit small capacity F1 race engines in trucks or ships and in powerful piston aircraft like the Spitfire.But the idea that (torque) drops off like a stone after peak torque has been reached is a contradiction in that peak power is basically a measurement of how well torque is sustained up the rev range after peak torque has been reached and usually relates to a drop of around just 10% of the peak torque figure at peak power.It’s after that peak power point,not peak torque,when torque,and therefore power,drops like a stone.
viewtopic.php?f=35&t=66627&p=830974&hilit=POWER+TORQUE#p830974
Another member alerted me to your post, and your other one linking here. Yes, I agree with you above, it was poor wording on my part.