24 replies to this topic

[pete l]

And what do the grooves do ? single or double.

[moitix]

 

 

Does the HLE box use the super-wide ratio gearset with the 2.95 diff?

 

Could be worth checking what effect this might have on gearing in first, second, and third before deciding on diff ratio.

What you mean by super wide ratio ? long gears ?

 

And how can i check that ?

 

Here are the ratios used on A+ in Metros (taken from Austin Rover tech info):

Metro (and other A+?) wide:  1.00; 1.425; 2.185; 3.647     (single groove on gears)

Metro 'super-wide' (HLE):      1.00; 1.435; 2.307; 4.004     (two grooves on gears)

 

Super-wide gears were typically used with high diff to get fuel best economy, but needed wider gears to allow hill starts etc.

 

No idea which minis ued these ratios, as I don't have any cars with gearboxes later than '72.

 

 

So in my case (1310cc metro engine) you think the a super wide gearbox with a 3.44 dif is a good combination ?

[MiniMadRacer]

At the risk of stating the obvious.. you cant  (well its not a good idea) .... changing just the final drive....you will need to change the pinion too.. they come as matched sets and should not be "mixed" up.

[Spider]

And what do the grooves do ? single or double.

 

The grooves (or lack there of) are only a quick means of identifying the gears.

 

 

At the risk of stating the obvious.. you cant  (well its not a good idea) .... changing just the final drive....you will need to change the pinion too.. they come as matched sets and should not be "mixed" up.

 

It is best to keep them together as 'sets' if they have run together, but over the years (and particularly when running the shop) there were times that this wasn't always possible and so occasionally, I have fitted up odd 'sets' and found no issues from doing this.

 

I think the 'thing' that does the most damage to these gears is continuing to run them with worn bearings. This causes the gears to mesh skewed rather than square to each other. They then run on the ends of the teeth, particularly 'On Power'. Even then, they stand up to this surprisingly well but will wear them quite quickly.

 

The factory gears are quite high quality.

 

The Pinion does need to be of a compatible type to run with the Crown Wheel, as apart from the tooth counts, there was 2 different tooth profiles. It's usually fairly obvious when fitting up if incompatible gears have been fitted as the assembly will lock up.

[carbon]

 

 

 

Does the HLE box use the super-wide ratio gearset with the 2.95 diff?

 

Could be worth checking what effect this might have on gearing in first, second, and third before deciding on diff ratio.

What you mean by super wide ratio ? long gears ?

 

And how can i check that ?

 

Here are the ratios used on A+ in Metros (taken from Austin Rover tech info):

Metro (and other A+?) wide:  1.00; 1.425; 2.185; 3.647     (single groove on gears)

Metro 'super-wide' (HLE):      1.00; 1.435; 2.307; 4.004     (two grooves on gears)

 

Super-wide gears were typically used with high diff to get fuel best economy, but needed wider gears to allow hill starts etc.

 

No idea which minis ued these ratios, as I don't have any cars with gearboxes later than '72.

 

 

So in my case (1310cc metro engine) you think the a super wide gearbox with a 3.44 dif is a good combination ?

 

No, not unless you are planning on towing a caravan up a 25% gradient.

[moitix]

No, not unless you are planning on towing a caravan up a 25% gradient.

 

 

So in your opinion just put the HLE gearbox into the Mg 1275 engine ?

Edited by moitix, 08 July 2019 - 09:05 PM.

[carbon]

No

[moitix]

No

 

now i´m confused HLE with 3.44 dif or keep the original ?

Or what is the other option ?

[carbon]

Moitix,

 

You need to think carefully about the following:

- your engine state of tune and power band

- intended use of the vehicle

- your driving expectations

Any gearbox will work. Having a gearbox which performs well is another matter entirely.

[Spider]

For spirited driving, I find the (original) Cooper S ratios nice, with a 3.44 diff and cams up to a 643 type of profile.

 

If you tend to get caught up in traffic often, then the stock (no line) ratios would be more suitable and you'd only likely have (or want) a very mild cam at the most for this kind of regular driving.