OK, that explains why some of the numbers don't match. My question:
Was there a L d'N OD with a 25% reduction?
"David F. Darby" wrote:
>
> Subject: Re: OD transmissions on ZA MG and rear axle ratios
>
> > Bullwinkle wrote:
> > >
> > > CR:
> > >
> > > They also state that the 4.55/1 car did 85.8 MPH at 5250 RPM and the OD
> car did
> > > 90 MPH at 4400 RPM. Does that still work out at ~25% reduction?
> -------------------------
> > CR asked
> > However, the non-OD final drive ratio in this example (4.55:1) is
> > different than in the former one (4.87:1). Did they test more than one
> > car?
> -------------------------
> The ZA utilized a 4.875:1 rear axle ratio. After a whopping 10% horsepower
> boost in the ZB, the 4.55:1 was introduced. While the factory might have
> played around with OD, I've never seen it listed as an option for the car.
>
> Regards,
>
> David F. Darby
> http://www.mgb.bc.ca/mgz
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