Quote:
Originally Posted by Suberman
Anybody noticed that the Honda engine doesn't produce significantly more torque than the Subaru?
Acceleration is a function of torque to weight ratios. Power to weight ratios are just shorthand for torque. Only torque accelerates. This is why supercharged engines punch so far above their weight if power to weight ratios are used. Of course poor low end torque can be compensated for by gear ratios but drivability suffers big time. Anybody look at the 50 and 100 cc TT motorcycle numbers? 14 spd gearboxes and a very narrow torque band.
Rpm makes more power for any given torque at that rom but generally speaking moves the torque curve up the rpm range.
Since volumetric efficiency for emission certified street engines is getting pretty uniform these days this is no surprise.
Bmep is the holy grail. Can you get high bmep at low rpm and at high rpm! Hello variable valve timing.
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Torque (in a naturally aspirated application) is a function of displacement.
1 liter = 75lb/ft +-5, roughly
Power is work over time. Put it this way. If you give us weight, drivetrain configuration, and horsepower, we can accurately predict a 1/4 mile time. However, if you give us weight, drivetrain configuration, and torque, it could be anywhere.