<VV> Donut Spare Tire

[airvair]

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.

-Mark

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
> both
>  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.
>  HTH
>  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.. .
>