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MG MGB Technical - How much power rear diff can handle

Hi!
I need to know how much power can a rear diff/axles from a 79B can handle.

does someone with a V8 conversion still uses.
have someone broke a axle from a B?

Thanks.
Luis Rodriguez

The Salisbury axle (used after '69 I think) is very strong. It was taken from a 'Van or light truck' application.
I am using a range rover EFI 3.9 V8 , for about three years now, with not a hint of trouble, other than spring wind up, which has nothing to do with axle strength. I tend to go heavy on the acellerator.
I have heard various guesstimates of 235 BHP no problem.
The 235 would be stage two heads on a 3.9 or possibly a standard 4.6, which have been used many times. This would have to be a solid figure.
I currently thinking of fitting a 4.6, with stage two heads. I intend on seeing how the rear handles it. I think it will. However I intend setting up a trailing three link to deal with the BHP. If i were to fit a super charger, just to see how far I could go, then I would change the rear.
Peter

Have a browse around this local, lots of serious horsepower here.

http://www.britishv8.org/British-V8-Current-Issue.htm
Peter

It's not horsepower that kills transmissions and axles, it's torque. The later MG axle is pretty good, probably ok for up to around 350 foot pounds with moderate throttle applications and not too many drag race starts. It's a little less strong than the Chevy 10 bolt which was used behind most small block V8s unless in a specific racing application, but about the same. Generally speaking the larger the ring gear diameter the stronger the axle overall. The real downside of using the MG axle is the limited ratios available. Having another axle such as the Chevy cut down to fit is expensive to start, but lots of ratios available for it.
Bill Young


Bill is absolutely right that "The real downside of using the MG axle is the limited ratios available." For V8/V6 conversions, another issue is the cost of limited slip differentials... they're cheap for Ford or Chevy axles.
Curtis

Dont the V8 racers stil use the Salisbury Axle? Those cars push out 400 HP!
Stan Best

This thread was discussed on 25/07/2007

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