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RE: Dyno results



  Don't forget there are two ways to measure HP at the crank, which is
always highest, and at the rear wheel sometimes called corrected HP.  Both
are accurate it is just different methods.

On Mon, 15 May 2000, Retherford, Martin wrote:

> 	One thing that may matter would be the actual HP scale.  Our British
> friends measure things in bhp - break horse power.  I specifically do not
> know the factor for the difference or even if there is a difference.  I
> however suspect this is the problem.
> 	Now that I have said nothing in the previous paragraph, I hope this
> helps. :-)
> 
> Martin Retherford
> 
> -----Original Message-----
> From: Eric Sheley [mailto:eric@xxxxxxxxxx]
> Sent: Monday, May 15, 2000 10:02 AM
> To: ST@xxxxxxxxxxxxxx
> Subject: Re: Dyno results
> 
> 
> At 08:58 AM 5/15/00 -0500, Bird, Garry wrote:
> >****This is not a California spec bike.  It's got the Canadian spec 
> >emissions controls, eh.  Like, nothing.  My buddy just had his Speed 
> >Triple dynoed on the same machine and he came out with 97 hp.  Now I feel 
> >really sick.  I'm trying to convince a Sprint riding buddy of mine to get 
> >his bike dynoed so we can compare and see if there really is a problem.****
> 
> If it's not a CA spec bike then it should easily be in the mid 90's.
> 
> There are a couple of things on the dyno setup that can be causing this.
> 
> First - slippage of the rear tire. If the Speed Triple has better tread 
> than that could be your first source of the difference.
> 
> Second - Air temperature reading. All dynos account for humidity, pressure 
> and temperature. The position of the temperature probe on the dyno is very 
> important. If they have the probe just hanging on the front of the rig, you 
> will see a lower reading on your dyno. Because the ST draws air from behind 
> the headstock it requires a good airflow to get cool air to the airbox 
> (remembering that the speed triple has no fairing). Normally on the road 
> this is not a problem, but on a dyno usually they just have a fan blowing 
> air toward the bike. In order to get an accurate measurement of temp (and 
> with it, probably a higher hp) the probe needs to be in the airbox. You can 
> easily check the difference in temperature if the dyno is at a triumph 
> dealer by hooking up the programming tool and use that to look at the 
> temperature that it is measuring and compare that with the dyno probe.
> 
> HTH
> 
> - Eric
> 
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