If you got your comet clutches from Roy at QDS, they are tuned for the 10HP
Briggs engine.
If you couldn't get it into the overdrive ratios you may have been geared
too high? or you had a lot of friction in the drivetrain?
Remember from Olav Aaen's book, optimum CVT efficiency is at 1:1 ratio.
James
-----Original Message-----
From: owner-mini-baja@Autox.Team.Net
[mailto:owner-mini-baja@Autox.Team.Net]On Behalf Of eric hutchenreuther
Sent: Thursday, January 25, 2007 8:30 PM
Cc: mini-baja@autox.team.net
Subject: RE: CVT Comet 790
The engine side of the CVT tightens up as RPMs increase. The driven side of
the CVT tightens up as the load increases. They balance each other so that
hopefully the belt ratio is optimum.
When we switched to the 790 we had trouble getting it to shift into the
overdrive ratios. I think this is because from the factory it was tuned for
a 2 cycle snowmoblie engine that revs a lot higher than the governed briggs.
Tuning is accomplished by changing the center of gravity and mass of the
weights, changing spring ratios, or changing the angles of the helix.
e
>From: "John G." <jjjsix6@hotmail.com>
>Reply-To: "John G." <jjjsix6@hotmail.com>
>To: vinayakgarg@gmail.com
>CC: mini-baja@autox.team.net
>Subject: RE: CVT Comet 790
>Date: Wed, 24 Jan 2007 09:46:52 -0800
>
>The ideal CVT holds the engine at a constant RPM as it changes ratios.
>
>
>>From: "Vinayak Garg" <vinayakgarg@gmail.com>
>>Reply-To: "Vinayak Garg" <vinayakgarg@gmail.com>
>>To: , grano002@bama.ua.edu, emhutchenreuther@hotmail.com,
>>kevindedwards@gmail.com, thomasdehnke@msn.com, bwedderburn@gmail.com,
>>schalk.els@up.ac.za
>>Subject: CVT Comet 790
>>Date: Wed, 24 Jan 2007 14:45:50 +0200
>>
>>Hi,
>>
>>Let me introduce myself as Design Head for the Mini Baja Team of IIT
>>Delhi,
>>India.
>>
>>We desire to have the performance curve for the Comet 790; i.e. a curve
>>for
>>change in reduction ratio at various RPM's.
>>
>>Thanking you,
>>
>>--
>>Vinayak Garg
>>Indian Institute of Techonology, Delhi
>>India
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