55 replies to this topic

[maystro]

Hi Guy's

 

I'm doing a bit of a upgrade, well actually a major upgrade.  

 

I was the bloke with the 998 block which had the loose cylinder liner which eventually gave way like everyone here said it would :-( 

 

Anyway so I was lucky enough to secure a 1293 engine and MSE4 head from Minispares, also a couple of other nice parts. 

 

I have pulled the motor out of the car and removed the  the gearbox from the motor.  Everything looks pretty pretty good in the box and it should since my family has owned it since new and has low kilometers and works flawlessly.  I did buy a full rebuild kit for this box but I am thinking of only using the parts I really need and not messing with something that is working great.   

 

What are your thoughts on this?

However I bought a Quaife ATB diff which I am really looking forward to putting in and driving with.  I also got the 2 diff bearings.

  

Is their any tricks to installing a Quaife diff in A+ box like having to machine any metal from the diff case? 

Also to set up pre load on the diff bearings do I only need to do this on the clutch side so basically just wack over the shaft to one end then check for pre load on the other and shim one side?  

 

Any other tricks or help are most appreciated?

 

Thank  Brad

 

 

 

  

[GraemeC]

Depends on the CWP used - I had to tickle a very small amount of the casting off, easily done with a flap flap wheel in a drill.

[maystro]

Thanks' excuse my ignorance but what is CWP?

 

Brad 

[nicklouse]

Crown wheel and pinion.

 

does the quaife have the same BCD/PCD as the standard diff?

[imack]

The current quaife will take standard crownwheels and pot joints.
I've had standard crown wheels and MED sc crown wheel, no mods required for my remote box

[maystro]

Thanks Imack, I have a rod change which should be similar or just as compatible considering its a later box.

[Spherix]

What's the reason for going for the Quaife unit?

[mini13]

What's the reason for going for the Quaife unit?

to limit the slip

[imack]

Shim as per standard diff, usually from the speedo drive end.

[Spherix]

What's the reason for going for the Quaife unit?

to limit the slip

I know what it does, I just wondered why OP wants it in his car.

[Cooperman]

Personally I have never been able to get to like LSD's on road cars. In fact, it might be me as I have tried them and they make me nervous when trying to go quickly.

For racing where the ability given by an LSD to get back on the power early in the corner is a big advantage they are great for saving a second or more per lap. Remember, unlike a normal diff, with an LSD, when you lift off the car tends to understeer, whilst when the power is applied it tends to 'turn-in'. This is the opposite of what I have always liked about the Mini - the 'lift-off oversteer'.

I do recall the first time I drove a Cooper 'S' with an LSD. It was at night on a twisty road in the wet. I got to a corner which tightened and I lifted off to find it went into what was to be terminal understeer. Then I realised that I needed to have the power applied and it just, only just, got round the corner.

However, some drivers (better than me!) do get good results with those diffs on tarmac rallies, although they are a bit of a liability on gravel where the lift-off oversteer is essential. I suppose a lot of it what you get used to over time.

They are really for competition and not any real advantage on public roads.

[maystro]

What's the reason for going for the Quaife unit?

I'm no boy racer, the reason is to get up my driveway.  It is steep and has bad entry angles where usually one wheel loses contact with the tarmac.  I thought this might be a cheaper avenue than converting my Moke to 4WD.  Also I like the durability of the Quaife, it's practically bullet proof.

[GraemeC]

The Quaif

 

 

What's the reason for going for the Quaife unit?

to limit the slip

 

 

Not really as it isn't a LSD.

 

I doesn't behave as Cooperman describes - lift off and it will behave just like an open diff and not push you into the scenery.

It does have some limitations though. One being the OP's intended use - lift a wheel and it won't help you.

 

For a street car it'll give little no advantage at all, other than making your car lighter by emptying your wallet!  Stick to a cross-pin and use the £700 change to improve the car elsewhere!

[maystro]

The Quaif

 

 

What's the reason for going for the Quaife unit?

to limit the slip

 

 

Not really as it isn't a LSD.

 

I doesn't behave as Cooperman describes - lift off and it will behave just like an open diff and not push you into the scenery.

It does have some limitations though. One being the OP's intended use - lift a wheel and it won't help you.

 

For a street car it'll give little no advantage at all, other than making your car lighter by emptying your wallet!  Stick to a cross-pin and use the £700 change to improve the car elsewhere!

Oh well, I'm sure it will give me some gains over my standard diff regarding slipping, maybe not the one wheel moments.  Anyway it as tuff as they come and that will do me.

[Spherix]

Not sure how that driveway looks, but from the sound of your starting post, you'll also gain quite a few horses to get up the ramp. Don't forget the Quaife is there all the time, and will have an effect on the roads that are not your driveway as well

Edited by Spherix, 15 May 2021 - 08:29 AM.