Does anybody know the ratio of HP at the flywheel to HP at the rear wheels.

I recently had the engine run up on a Dyno to establish motor HP and was given a printout of 126HP at the rear wheels at 4900 RPM.

I want to calculate the HP at the flywheel!

Is that 126HP on a stock L24 with round tops?

No the Z is not standard.

I was not sure of the engine mods that is why I got the car dyno checked.

From the outside the car has an N42 head, extractors and uses the standard round topped SU's. By the idle sound it has a fast road cam.

So 126 HP at rear wheels is OK as the motor has 575 NM of torque at 90 kmph.

Yes I was at Niagra Falls 2 years ago and have seen how the falls freeze up some years.

Brisbane is sitting at about 30 degrees C at this time of the year.

I like snow but only to ski in.

Are you sure that the car has 575nm at 90km? That seems a bit much for only 126hp....get back, cause if it is then he should be putting that engine into a tractor!!!:classic: