Talk Morgan Forums Morgan Sports Cars Morgan Three Wheeler & Super 3 This really bothers me...

If I get my neck sorted to the point where I can ride a bike again I'll be getting another "New Bonneville"....Imperial Purple and white would be nice....!

Peter I'm not particularly taking a poke at you. It is just that you have summed up pretty well what a number of people are saying.

There are a fair number of motorcycle manufacturers who make bevel drives that do not whine and many of them have motors that are on a par for power (but not for torque pulses) with the S&S motor fitted in the M3W. In fact Moto Guzzi bevel drives have been used in a tremendous number of 3 wheelers. With new bikes there are very rarely any warranty problems and the most common of those is an oil seal failure. Mounting the bevel box on isolating material instead of directly on the frame may help some but I would have expected Quaife to have done better. I have never seen inside one but I wonder if they are using straight cut gears instead of helical cut gears. Let us hope for some improvement in future models.

Yes, I have changed the springs in my car but that was a choice, not a necessity. The issue with the M3W is something else alltogether. I have only driven an M3W in a flat car park so I can't really comment from personal experience and it was an early model in any case. The very fact that people are reporting differing experiences seems to point to slight variations in steering setup having a tremendous effect. Without a doubt there are technical design issues but it does seem that the steering can be improved with the existing setup. I am sure that within a short while there will be solutions available from Morgan and that someone will finally work out why some are experiencing bad bump steer and others not.

Yes, "it is, what it is", but it could be better, in fact the bevel drive should be better, and personally I think that the people who are complaining about bad bump steer are not imagining things, but even for that there seems to be at least a partial solution on the way. A little patience, understanding and good will is required on all sides.

Quick explanation - straight cut gears are inherently noisy, helicals much less so.

A race mini with straight cut gears whines like a banshee.

The whine is not a problem, a function of straight cuts, just get upset if it clatters around on neutral throttle.

Like the avatar Martyn

But why do only some of them whine ?

Exactly, I doubt there are two different designs out there getting all jumbled together.

That's right.
Why some bevel boxes are noisy and others not ?
But also why some have bump steer and others not?
We own two M3W's and both have noisy BB and both have just a little bit bump steer.
To our opinion !!
Our dealer tells us, these BB's are quiet compared to others.
Who can tell me,at what level you starts calling it noise what you hear from the BB and when you starts calling it bump steer when you hit a bump ?

Good questions Laurens !

I know what a quiet BB sounds like because I've got one, there's no noise at all
I'm pretty sure I've got bump steer as bumps can violently throw the car off course .

I don't think anyone knows. My understanding is quaife don't know why some in a batch are quiet and others not.

It does seem that what's produced to an acceptable standard for a track car in terms of noise, tolerances isn't good enough for the 3 wheeler. When Krazy Horse get the rolling road sorted out we can do some back to back analysis.

I did ask about the rolling road when I was in there the other day , but realised after I left that I wasn't clear what George had told me ! I think it's in a position to do a basic bhp check but not able to do tuning etc yet. I will find out .