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Originally Posted by X-ale
Petrol has more kw(top speed), diesel has more Nm(acceleration), a 2L turbo petrol = a 2.2L turbo diesel = a 3.4L n/a petrol = a 1.3L n/a rotary petrol = a 1.6L n/a rotary diesel (FIA) :arrow: but in this case, since these engines all produce the same Kw, any diesel will be averaging a +10~15% in Nm. So I'd take the diesel and start runing biodiesel. That would be a 10% more acceleration for 4% total biodegradable pollution!!
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If you compare a 2.0 turbo petrol with a 2.0 turbodiesel, and put in exact the same car, the petrol will outperform the diesel.
The diesel may have a little bit more torque (it depends which engines you're comparing) but due to the smaller rev-range longer accelerations will be less fast.
When accelerating form a certain speed, the diesel with more torque will be quicker in the beginning, but will run out of revs (torque drops really fast at high revs due to the engine speedlimiter on diesel engines), where as the petrol will continue accelerating. Eventually you will also ran out of revs with the petrol.
This limited usefull rev-range limits longer accelerating runs. Also a diesel will have longer gear ratio's (due to the low rev characteristic), which is not helpfull for fast accelerating times.
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