David Bayer wrote:
> 
> > > How much in tire diameter could 6% represent?
> > > Peter Larsson
> > > 1994 EV Crewcab Syncro
> >
> >
> >  Hi,  Would it be that the tire diameters can't be more than 6%
> > different in diameter? Or would gear ratios play a part in the equasion?
> > If it is just Tire diameters you can take the exact diameters of each
> > tire and mathimatically figure the percentage of the difference in size.
> 
>         The quote from the manual said 6% across the viscous coupling, but
> if the final drive ratios are the same for the front final drive and the
> rear final drive (which they would have to be if we are supposed to use the
> same size tires on all four wheels right?), the gear ratios cancel each other
> out. So you would be able to calculate the allowable difference for a given
> tire size based only on the diameter. Also, I would think one should allow
> a bit of headroom for going around corners where the back wheels will not
> take the same track as the front wheels and thus will not be turning at the
> same rate.
> 
> dave

Hi Dave,  Yep, I think you are right. The usage of percent instead of
degrees kind of made me think. I guess 6% would be 21.6 degrees of
slippage in every revolution of the vc. Sure seems like a lot.  Todd