<VV> Donut Spare Tire
airvair at richnet.net
Fri Jul 7 20:44:22 EDT 2006
The guy I bought my '69 (infamous) Corsa from had traded in a '66 Corsa
that had posi in it. When he ordered the '69 he specifically avoided
ordering the posi because he had had an occasion to run a different size
tire on the back. He burned up the posi in it, so didn't want that to
happen again. Hence the no-posi order.
Andy Clark wrote:
> The clutch pack makes the rear axle act like a solid axle in straight-ahead
> travel. It's always "engaged", therefore, there's always power going to
> wheels. This is great for power transfer to the ground, until you try to
> turn a corner. That's what the clutch is for, to allow different wheel
> speeds in a corner, by slipping, while still applying power to both wheels.
> Also, when one wheel slips, the clutch pack slips, but still provides some
> power to the non-slipping wheel.
> The effect of having two different size tires on a posi axle is that it
> thinks that the car is turning constantly, and slips to compensate for the
> different wheel speeds. This constant slipping will tend to overheat the
> pack, which causes it to gall and wear excessively.
> Andy Clark
> 1966 140/4 Monza Sedan
> 1966 140/4 Yenko Clone
> 1966 180/4 Cord 8/10 #60
> ----- Original Message -----
> Subject: RE: ?VV? Donut Spare Tire
> ? Correct me if I'm wrong.
> ? The clutch pack in a posi is designed to send power to the slower turning
> ? wheel. With one wheel a different diameter it would be constantly engaged
> ? and trying to deal with the different wheel speeds of the two different
> ? diammeter wheels due to the undersized donut spare.
> ? Regards,
> ? Joel
> ? -----Original Message-----
> ? ? Subject: Re: ?VV? Donut Spare Tire
> ? ?
> ? ? "splain why it would burn out a posi.
> ? ?
> ? ? Dave.. .
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