Your very small horses, they belong to me!

Well, I popped down to Cheltenham Motorcycles open day to take advantage
of their all day dyno extravaganza.

I am proud to announce that the Harley recorded the highest power figure
of the day so far! There are advantages to being the first bike on the
dyno.

http://www.funduro.demon.co.uk/dyno.htm

Gutted.

 

That's not too bad for a Harley though, is it? I've heard of some models
being less than 30hp when on the dyno.

 

You should be pleased! It's more than Harley claim for their current
1200s.....

Dave

 

Well, I'm led to believe that out of the crate 883s have been known to
dyno as low as 27bhp though they typically are nearer 35bhp, and as mine
started out as one of them I shouldn't be too upset.

Then again, with the spec that I'm now running, the consensus in the
American Harley web sites is that it should be about 80bhp. So on that
basis I'm not quite as chuffed.

Of course, if it did have 15-20 horses more than it does now then it
would be fucking lethal.

 

Is the chart "at the wheel" or have they compensated for transmission losses
to show "at the crank".

I know with car charts its usual to show "at the wheel" then a guesstimated
calcualtion for the crank power.

--
Alex

Hermes: "We can't afford that! Especially not Zoidberg!"
Zoidberg: "They took away my credit cards!"

www.drzoidberg.co.uk www.ebayfaq.co.uk

 

This was at the wheel rather than at the crank. Unfortunately due to the
wondrous ignition leads I'm using they were unable to get an engine
speed reading and hence unable to get a torque curve.

They tried hard to console me that if they could have shown it the
torque curve would have been massive but by then the damage had been
done :-(

 

I really must put the Guzzi on a dyno just to see...

 

See, that's the mistake I made.

I was tempted to either fit the louder exhausts and try the Harley again
(probably to be disappointed again) or take the R80 down.

As the weather was biblical I decided to do neither

 

Exactly.

I'd always hoped that my Sportster would be knocking on the door of your
Buell's figures, especially as I don't think my spec is massively
different to yours.

Either the dynos are set very differently (unlikely), my carb is way off
(don't think so), my ignition timing is way off (don't think so), they
didn't take it right to 6,800 (can't tell [1]) or my engine is a slug
(possibly, but it doesn't feel like it)


[1] They couldn't get a spark "pulse" from my leads so the RPM is not
recorded so I can't be sure. With the dyno runs being for charity, I
didn't want to spend long arguing and analysing the results, especially
as the bike had been released from the dyno before the results were
handed to me.