It is not as practical to measure the crank HP after a motorcycle is
assembled with its transmission, but one can measure the HP at the
transmission output shaft or at the rear tire. Both will vary with the gear
selected, but I reckon that if they can hold it on the dyno rollers, 5th or
6 th gear ought to be pretty efficient.
115 HP is the factory claim stock on a GSXR600 last year. That is crank HP.
1000cc street bikes like Hondas easily make another 8 HP from just a remap
and an exhaust. 3 to 5 is a popular figure for 600cc bikes.
Therefore 120 Crank HP, not rear wheel HP, is a nice round figure for the
GSXR600 motor with an exhaust and remap. A Honda 600 may have more.
One of the motorcycle track day guys at work is bringing in his copy of the
latest magazine shoot-out of the hot 600cc bikes. Worst case rear wheel HP
ought to be in the 100 to 110 range.
Chuck
From: "Jay Novak" <[EMAIL PROTECTED]>
Reply-To: [EMAIL PROTECTED]
To: <[EMAIL PROTECTED]>
Subject: RE: [F500] MC HP Creep
Date: Thu, 12 Apr 2007 21:48:17 -0400
I really think 120 is a stretch. I will try to put my new GSXR 600 on the
dyno sometime in the next couple of months.
Thanks ... Jay Novak
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of Art
Sent: Thursday, April 12, 2007 9:26 PM
To: [EMAIL PROTECTED]
Subject: RE: [F500] MC HP Creep
Chuck,
I have been told by a good friend who is no longer in this sport that he
dyno'd his 494 Rotax in the 92 to 95 HP range at the rear wheels. Of
course,
that may vary somewhat depending on one's tune. I don't think anyone is at
100 HP, but I could be wrong :-).
Perhaps others might want to share their results with this list :-).
Art
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Chuck
Voboril
Sent: Thursday, April 12, 2007 10:30 AM
To: [EMAIL PROTECTED]
Subject: RE: [F500] MC HP Creep
I'd agree that 120HP is a good figure for now on a gas rord race GSXR600
motor for comparison since the motors are already very well developed from
the factory.
Does anyone have any argument that 100 HP is a good HP to use for
comparison
on the well sorted and piped Rotaxes currently?
These are all crank HP-not HP at the tranny output shaft or at the ground.
It ought to be interesting to watch the passes on the straights :->
Chuck
>From: "Jay Novak" <[EMAIL PROTECTED]>
>Reply-To: [EMAIL PROTECTED]
>To: <[EMAIL PROTECTED]>
>Subject: RE: [F500] MC HP Creep
>Date: Thu, 12 Apr 2007 10:15:54 -0400
>
>I think you are wrong about the possible HP gains Jim. The 600 race
>engine builders of MUCH MODIFIED ALKY engines are getting about 125 hp.
>In any case we are talking stock engines here & they will probably get
>3 to 5 hp from pipes. If they make too much power we will have to
restrict
them.
>
>I already have 4 or 5 good drivers who want to drive the car this year
>& I hope they will make plenty of public comments about the engine.
>
>Thanks ... Jay Novak
>
>
>-----Original Message-----
>From: [EMAIL PROTECTED]
>[mailto:[EMAIL PROTECTED] Behalf Of
>[EMAIL PROTECTED]
>Sent: Thursday, April 12, 2007 9:23 AM
>To: [EMAIL PROTECTED]
>Subject: [F500] MC HP Creep
>
>
>Please remember that whatever initial MC HP you use, whether published
>or found on the dyno, will go up about 25 HP after the racers have
>sorted the motor out over a 2 year period. This has been proven over
>and over again since the beginning of car racing. For the sake of
>keeping both the 2 stroke/CVT and MC choices roughly equal, this
>additional HP has to be kept in the calculation.
>
>Jim
>
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