[F500] 493 - 494 dyno curves

[dogill80 at charter.net]

Chuck,

I cannot agree that a 5.8% difference in horsepower on the top end is
"remarkably similar" and I predicate my judgment on the "remarkably similar"
horsepower figures of the AMW and Rotax, Kawasaki and AMW, and Chapparal and
Kawasaki.  If Helio (Castro Neves), Mark (Martin), Ron (Fellows), or Kimi
(Raikonnen) believed they had that much horsepower advantage over their
competitors, they'd soil their knickers every time they strapped in.

I realize the caliber of competition at our levels is quite simplified,
several orders of magnitude lower in economic input, and less pivotal in our
daily lives.  However, if we are going to compete, we need to try to do this
one ( as opposed to the AMW vs. Kawasaki and Rotax vs. AMW) a bit better.
If applying 38mm Mikuni's to the 493 effectively evens the power output, I
will get on the 493 bandwagon but, first, I need some assurance that this
new motor will not instantly obsolesce the existing engine configuration.

dg


----- Original Message ----- 
From: "McAbee, Chuck" <Chuck_McAbee at csx.com>
To: <f500 at f500.org>
Sent: Friday, January 30, 2004 9:57 PM
Subject: RE: [F500] 493 - 494 dyno curves


> Jay -
>
> One question....Was the 493 run with it's stock 40mm Mikuni's or with
38's?
>
> The 494 is stock with the 38mm Mikuni's.
>
>
> I agree the data shows the engines to be remarkably similar.
>
>
> Chuck McAbee
> SEDIV #16
>
> -----Original Message-----
> From: Jay Novak [mailto:jnovak6 at wideopenwest.com]
> Sent: Friday, January 30, 2004 22:49
> To: f500 at f500.org
> Subject: [F500] 493 - 494 dyno curves
>
>
> OK guys, I have been trying to get dyno data from Rotax for a couple of
> weeks.  I just got it last Monday by fax.  I finished putting together a
> graph comparing the data of the torque & hp of PRODUCTION STOCK 493 &
> non Rave 494.  The data that I received was in metric units, Nm torque
> (Newton-meters) & engine rpm (also had Kw, fuel flow etc).  The faxes
> were Rotax data sheets.  I copied the data to Excel, converted the
> metric torque data to ft-lbs & then calculated the SAE hp.  Take a look
> at graph at the link below & I think you will see that we have two very
> similar engines.  I put lots of notes on the graph defining some of the
> variations in the 2 engines.  I think that they are amazingly close
> above 6000 RPM for being totally different designs. (Reed vs. rotary
> valve).  It is pretty clear to me that the performance will be VERY
> similar in the cars.  Remember these 2 curves represent the engine's
> performance with production exhaust systems & not your typical Aaen pipe
> setup.  It seems to me that with our Aaen pipe setup we have been right
> at 8000 rpm in any case, so the HP on the race track might even be
> closer.
>
> I hope that this helps to clear up some issues for many of us.
>
>
> http://www.f500.org/rotax/
>
>
> Thanks ... Jay Novak
> NovaRace Inc.
>
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