500cc 2stroke GP bike enigines, what are their power outputs?

[Dino IV]

Remembering having a german "Sport auto" from 1994 somewhere in the house, where they took a 250cc Superkart to Hockenheim, I started digging .......... and couldn't find it, sorry. But I remember those guys being impressed by the laptimes.
Cool stuff Warwick!

Dino

[yelwoci]

The power of an engine relates to several things as I'm sure you all know: CC, 4/2 stroke etc, but the main difference between bike engines and normal car engines is the way they gain their volumetric efficiency.

F1 has followed the bike technology in running as high as rpm as mechanically possible (F1 approaches 19,000 this year, and some bike/kart engines do 22K).

Most normal car engines are design to minimise the fuel consumption, maximise smoothness etc. They gain their power by good flow at relatively low rpm.

There is a brillant article on this in V-angles in Racecar Engineering.

Larger bikes are effectively detuned to create more torque and smoothness.

If you look at the fuel consumption of a Yahama R1 in terms of fuel consumed per KG Mile (to mix units!) its an order higher compared with a car.
Y-R1 w/100kg rider @25mpg = 25*(170+100)=6.75K
Porsche 911T w/100kg driver @15mpg = 15 *(1350+100) = 21.75K
F1 w/80kg driver @3mpg = 3 *(550+80) = 1.89K

Read V-angles, rather than my twaddle
:-)
IanC