Talk Morgan Forums Morgan Sports Cars Classic Morgans (pre-CX) Limited slip diff.

Ten pence worth..

The Quaife LSD is well made and strong, does not work if there is no torque provided to one of the drive wheels end of story.

If you drive all year ice, snow muddy water filled roads the a plate driven LSD is a better option for traction. But it would need the correct springs to refine its harshness.
The Stock Morgan axle has been a BTR used since 1996 and is metric, Not imperial Dana (American) UK Salisbury.

Morgan use both types. Mine sits on the bench waiting to be fitted when I get some time, it came from a crashed very low milage Mog and is the plate type.

The Aluminum Platform Plus 8 has a LSD, I believe the standard BTR one. From the new Aero 8 S5 onward this changes to a BMW sourced LSD. Does anyone know if the BMW one is a plate or gear type.

I can confirm my 2013 +4 has an LSD as the MOT mechanic demonstrated the two rear wheels rotating in the same direction whilst up on the ramp yesterday. Nice to know with all the soft mud verges on the single track roads around here.

[quote=Cain]Ten pence worth..

The Quaife LSD is well made and strong, does not work if there is no torque provided to one of the drive wheels end of story.


Cain,
I don't understand your comment. Can You explain a bit more?

Button
Seattle

I think I know what Cain is referring to.

In practice if one driven wheel has no grip, say ice or mud, the drive will not pass to the wheel with the grip, as it would with a plate type diff.

I have never rated this type of Limslip, for this very reason, for example, pulling hard uphill around a tight hairpin bend, the inside wheel will spin uselessly, but no power will be transmitted to the outer wheel until more grip is found on the inside, the very time an LSD would be essential I would have thought. Right Cain?

Thanks PaulJ.

Button

This is true, however (and it's a very big however) in most real-world driving the circumstances in which one will get absolutely no grip whatsoever on one wheel are pretty rare: yes, it'll happen on ice or slick mud, but really not very often unless one goes looking for it.

In all other circumstances, where there is some grip available, a gear-type LSD does very well indeed, certainly far better than an open diff, and it does so without the inherent disadvantages of a locking plate diff.

For rallying, or for track racing, a locking plate diff is what you need. For normal road driving, a gear diff is a better solution in my view.

Memories of my cooper s with a plate LSD are coming back here. No time to take your eyes of the road and two hands on the steering wheel were definite requirement.

I agree, I once drove my mates rally mini, on a country lane. i was bouncing off both hedgerows.