To me it’s a bit like measuring the power of an audio amplifier, unless I can see a figure quoted in RMS – root mean squared - then I don’t know what the numbers mean. For example 100w Total Music Power what does this mean – divide it first by the number of channels, ie 4 so we are now down to 25w. I now suppose we can half this because the amp is measured when over driven (total) so the sine wave now goes square so we are now down to 12.5 which I should think this is now down to about a true RMS value.
So the same audio amp advertised as 100w tmp is now 12.5w RMS, there are other ways manufactures advertise the power so don’t get sucked in by bigger figures unless you know what they mean

Bike ‘power’ is not the be all and end all – torque has a big factor in this, I also ride and 1100cc v twin, power at the lower rev range due to the long throw of the crank, hence more leverage.
Electric bike where there is more torque at 0 revs – but that’s another story
Auto scooters, how can you measure the power at the rear wheel unless you lock the variator as it will be constantly be changing to run at its best – so altering the gear ratio, thus changing the figures.
So why not measure everything with one unit – Watts seems to work, why invent another.

Just my ramblings

gn2 wrote:Same way anyone does, he'll just make it up.
As it happens I know that a Mana makes about 76 Hamish Powers.

Like it!

I was once told by a very clever scooter tuner/racer years ago when I had my Italjet Dragser tuned. BHP sells engines (to kids on Runners) torque wins races.

gn2 wrote:Horsepower is a meaningless non-standard unit.
It's time we started using the proper unit, watts.
(named after a Scot)

Now, that, I wouldn't disagree with...

EDIT: Wikipaedeaeaeaea defines PS, (the German equivalent of HP), as "the power to raise a mass of 75 kilograms against the earth's gravitational force over a distance of one metre in one second", which actually makes it meaningful again.

Deeping wrote:To me it’s a bit like measuring the power of an audio amplifier, unless I can see a figure quoted in RMS – root mean squared - then I don’t know what the numbers mean. For example 100w Total Music Power what does this mean – divide it first by the number of channels, ie 4 so we are now down to 25w. I now suppose we can half this because the amp is measured when over driven (total) so the sine wave now goes square so we are now down to 12.5 which I should think this is now down to about a true RMS value.
So the same audio amp advertised as 100w tmp is now 12.5w RMS, there are other ways manufactures advertise the power so don’t get sucked in by bigger figures unless you know what they mean

Bike ‘power’ is not the be all and end all – torque has a big factor in this, I also ride and 1100cc v twin, power at the lower rev range due to the long throw of the crank, hence more leverage.
Electric bike where there is more torque at 0 revs – but that’s another story
Auto scooters, how can you measure the power at the rear wheel unless you lock the variator as it will be constantly be changing to run at its best – so altering the gear ratio, thus changing the figures.
So why not measure everything with one unit – Watts seems to work, why invent another.

Just my ramblings

It doesn't matter what you call the measurement figure...hp, ps, watts etc. You are measuring the same thing. It's where you measure the power, and how you measure the power that counts. Nothing else is very relevant. Manufacturers measure only crankshaft power output for the brochures. Rear wheel stuff is left to us mortals to work out. Recently in a large european factory I was visiting for a couple of days, I watch car engines being tested for PS and torque figures at the crankshaft. Very interesting it was too. The machine being used to test offered every available measuremnt for BHP, HP, both (DIN & SAE readouts), torque in 'lb ft & newton metres etc and yes, also in Watts in various guises. Too many to understand actually. My mind was a blurr...it usually is anyway! But it was interesting all the same.

Earl wrote:I was once told by a very clever scooter tuner/racer years ago when I had my Italjet Dragser tuned. BHP sells engines (to kids on Runners)

...and also to elderly teens on Maxi-scoots having a mid life crisis!

MrGrumpy wrote:

Earl wrote:I was once told by a very clever scooter tuner/racer years ago when I had my Italjet Dragser tuned. BHP sells engines (to kids on Runners)

...and also to elderly teens on Maxi-scoots having a mid life crisis!

There’s nothing wrong with a good healthy mid life crisis

I'm looking forward to mine!

Spike, they are overated. I'm in mine now...

Deeping wrote:

MrGrumpy wrote:

Earl wrote:I was once told by a very clever scooter tuner/racer years ago when I had my Italjet Dragser tuned. BHP sells engines (to kids on Runners)

...and also to elderly teens on Maxi-scoots having a mid life crisis!

There’s nothing wrong with a good healthy mid life crisis

HAHA I had mine in my 30's