Not true, I have a 24 and a 120 polychain setup and it works just fine.
Currently I think I have the 25/120 combo on, but I would not go much lower
than the 24. Plus many guys are doing a belt tension wheel which works
great. Also if you have a car with only two jack shaft bearings, do like we
did add a third on the outside of the shaft. During the installation of the
Rotax we noticed that if you pushed down on the belt it would flex the jack
shaft. That is why so many cars jump their belts. Have not had much
problem since!
BobbyJ
#5 Fmod NER SCCA
----- Original Message -----
From: "Jan Schmidt" <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Sunday, February 04, 2007 10:56 AM
Subject: Re: [F500] Getting the Kawi up to Speed
John,
Clean the grease/dirt off of the sides of the polychain cogs, then get a
black magic marker and put a dot on the side of the gear. Then, using
that dot as a reference point, count the #of teeth on both the big and
small cogs. Get a calculator and do the division. Big # divided by the
small one. That is how you get the real ratio. Let us know what you come
up with. I had the polychain cogs and belt on my car and changed it to
chain drive. There is no way to come up with a 5 to 1 ratio on these
cars with polychain and have the belt stay on the cogs. A 30 tooth small
would require a 150 tooth large cog. I have never even heard of a 150
being made. The biggest I have seen is a 120, which would require a 24
tooth small cog. The contace patch on a 24 would be so small, the teeth
would likely strip off the belt. Count them up and let us know what you
have now. Hope this helps.
Bill Schmidt 88 RD Kawi (with chain drive)
"John Vriesinga" <[EMAIL PROTECTED]> 02/04/07 6:52 AM >>>
.
Our car initial acceleration was very good but it does tend to tapper
off.
We primarily Autocross this car and it still performs very well with
this
ratio even
in Autocross. J. Murphy can confirm the quickness of this car when we
ran
him
a few years ago at a SE Div. event.
I've got info from the group I intend to solo with. Top speed on one of
their faster tracks would see me keeping up with the small hp cars. I
ran
mine at a quarter mile track last year and in a rather poor state I got
87
mph out of it. If you're able to hang even close to an f Mazda, I'd
guess
that I might be alright with the 5:1 ratio. I get up to 87 mph really
fast
with these gears. 8-) Heck I can spin tires at about 30 mph still. It's
sick! 8-)
JV
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