14 replies to this topic

[KaG]

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Please give your topic a title that quickly describes your problem. Just putting 'Help my Mini doesn't work' is useless to anyone trying to help.
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Hi why will my gearbox be whining any speed any gear

[Guess-Works.com]

Really depends, all A/A+ gearboxes whine to some extent, it's just the nature of the beast... However if it has recently started to whine more than usual then that's fairly indicative of something that's about to break.

[KaG]

Hi

The gearbox only started whining after a few months and it is leaking oil by the selecter shaft i have double seals there as per the manuel but she is still leaking and the gearbox is for a 1275

Also i want to have the box redone what do you guys think about strait cut gears do i have to buy them or can the current box be modified

[Guess-Works.com]

Does the whine go away when you press the clutch, is the whine audible when the car is stationary ?

4 speed Straight cut gears etc are all designed to be direct replacements for the std helical gearsets.

Edited by GuessWorks.co.uk, 03 May 2009 - 04:50 PM.

[MRA]

Guessworks, builds any gearbox in any configuration.... as long as it fits a Mini engine

Straight cut gears make a good Mini better to drive take less power to drive them, therefore more to the wheels

They do whine in 1st, 2nd & 3rd, but as 4th is direct drive the whine almost disappears, I have the full set in my 1996 Cooper 1330 and in my 1380 Turbo great sounding.... delivers a big grin

I wouldn't want to be without them, but some people say they are too noisy

Edited by mra-minis.co.uk, 03 May 2009 - 04:53 PM.

[KaG]

It Does it in all the gears 4th is the loudest also the sound is exactly the same than reversing at full speed so i dont think it is something that is done right.

I had a guy redo the box for me changed the rolos gears from the plastic casing to the metal casing once so could that also be why the gears are whining

And i am really considering going for straight cut gears and changing the raitio on the box but not sure what will be the best at the moment i get 140 km/h at 5000rpm and would like to get a better top speed

also i have a vibration on the engin on low speed but as soon as i get over 120 km /h then the vibration goes away is this also because of the gear box

[MRA]

Try this

http://www.guess-wor...nical/ratio.htm

Top speed is largely dependant on BHP and where it is in the rev range, ie. a turbo will generally max out at about 5500 where by a naturally aspirated engine could go on a lot further dependant on cam etc...

Vibration, is more likely to be caused by driveshaft/s being bent, wheel bearings failing, out of balance wheels and tyres (don't believe tyre companies when they say it's spot on ! there is ALWAYS a tolerance of xxx grams which could be 150g, as is standard in some tyre companies) or inner CV pot joints and side cover bush wear causing excessive movement....

[KaG]

Thanks

think it might be the driveshafts as the car also feels like it bounches so i will get started on the box and my straight cut gears and then will replace the driveshafts and bearings

thanks for the advice

[taffy1967]

What oil do you use? Perhaps filling up with a good quality classic 20W/50 oil might help?

[MRA]

What 20/50 that should be banished to moggy minors

Really I haven't used 20/50 for about 25 years, a good 10W40 is ideal, it will also give you slightly better fuel economy, and look up what oil Rover recomended for the Metro....

[taffy1967]

Yes and Rover also recommended a 12 month or 12,000 mile service on the Metro and on the Mini towards the end too. Completely LUDICROUS!

So you can use whatever oil you like, but my Mini has never run so well since I switched over to using 'Duckhams Q Classic 20W/50' a few years back.

Either way, it's the Mini owners who use the classic oil whose Minis go the distance as it's very good for the Minis engine and gearbox/baulk rings.

10W/40 is just too thin and sythetic oil is also a big no no.

Edited by taffy1967, 03 May 2009 - 09:50 PM.

[MRA]

Hi Taffy1967,

That's why my 1380 Turbo did well over 80,000 miles on 10W40 Anyone who knows me will tell you that I don't dilly dally about, but move with the traffic (if it can keep up that is)

However at the end of the day it's your choice, and I wasn't actually mocking you for it, honest

Regards Martin

[taffy1967]

I didn't think you were mocking me mate, so don't worry. lol

To be honest, I only used 10/40 for years as it was the recommended oil.

But mine just seems to run much better on the classic oil and I've heard stories of Minis virtually going around the clock twice on nothing but classic oil and regular oil changes, before requiring any work.

[KaG]

Sound good

will have a look at 20 w 50 i also live in South Africa so the weather here is quite warmer than in the uk will thiker oil help to stop the leaking on the selector shaft?

i am running double oil seals there and they are still leaking was thinking of putting motor bike oil in my car. Seeing that the gearbox and engine is also using the same oil and the motor bike oil has a special lubrication for high rev motors and gearboxes.

[KaG]

O another question

The mechanics around here say that top speed comes from the diff not the gearbox

does not sound right to me at all but they keep on arguing with me