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Home > Help Needed / General Tech Chat > gearbox ratio ???

minisurf

9 Posts
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26th Mar, 2007 at 10:00:20pm

Hello,
I've got an MG metro turbo engine and I want to know what is the standard diff ratio on the gearbox. There is nothing on the gearbox so I don't know what it is
I'v got a 2.95 diff ratio on my mini but I'm look for a 3.44 to fit my turbo engine so it will be great that the standard gearbox could be one
But unfortunately I suppose that's a 3.2

Thanks for your help

Tom Fenton
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Fearless Tom Fenton, Avon Park 2007 & 2008 class D winner

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26th Mar, 2007 at 10:01:23pm

If it really is a genuine non messed with tubo gearbox then it will have a 3.2:1 diff ratio.


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minisurf

9 Posts
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26th Mar, 2007 at 10:50:10pm

normally it's a genuine engine.
My trouble is that it's a goldseal engine with a strange number.
For example the piston's ref is 20831 wich seems to be +20 pistons.

Si my gearbox is normally a 3.2:1

Thanks a lot

Bat

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Bermingum

26th Mar, 2007 at 11:09:12pm

Hi,
What's the ratio for a N/A metro? Is there a list of g/box number = ratio, or doesn't it work like that?
Cheers,
Gavin :)

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stowmaket suffolk

27th Mar, 2007 at 09:05:55am

it could be any thing most were 3.4 but my mg had a 3.1 in it from new so take your pick

always looking for them bigger bunches of bannanas

minisurf

9 Posts
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27th Mar, 2007 at 09:25:22am

The only ref I found is on the diff : 83/12 in a circle

and the ref of the engine : BHM1668E 147716

minisurf

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27th Mar, 2007 at 10:13:47am

I spend my time searching everything about this engine but I always find contradictory informations

So once and for all
ref of the pistons : 20831 ID19 (standard size or +20 ?, dish ??)

diff ratio : 83/12 ??? impossible

Vegard

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27th Mar, 2007 at 10:22:33am

That diff ratio is definately wrong.
That's a 6,91:1 ratio which is nonsence.

The numbers you should be looking at for a 3,44 is 62/18

On 13th Jul, 2012 Ben H said:
Mine gets in the way a bit, but only when it is up. If it is down it does not cause a problem.

danboy

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27th Mar, 2007 at 10:39:21am

83/12

Date code Dec 1983 or possibly week 12 in 1983
Regards
Dave

Tom Fenton
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27th Mar, 2007 at 01:36:58pm




On 27th of Mar, 2007 at 10:13am minisurf said:
I spend my time searching everything about this engine but I always find contradictory informations

So once and for all
ref of the pistons : 20831 ID19 (standard size or +20 ?, dish ??)

diff ratio : 83/12 ??? impossible


To be quite honest looking at the reference numbers on BL engines is a waste of time and bloody effort as they are not a reliable indicator of what you have, especially with an engine that is potentially 20-25years old now and may have had any amount of buggering about done to it.

If you want to know what you have I suggest you get the measuring sticks out and measure pistons, and count teeth on the crownwheel and the pinion.


On 29th Nov, 2016 madmk1 said:

On 28th Nov, 2016 Rob Gavin said:
 I refuse to pay for anything else


Like fuel 😂😂

minisurf

9 Posts
Member #: 1595
Junior Member

27th Mar, 2007 at 02:14:47pm

I just count the teeths : 63/19 so My gearbox is 3.21 ratio...sniff

Now I have to resolve the pistons number


turbodave16v
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27th Mar, 2007 at 02:46:32pm

http://www.turbominis.co.uk/forums/index.php?p=vt&tid=711

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minisurf

9 Posts
Member #: 1595
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27th Mar, 2007 at 03:36:12pm

thanks
so my pistons have a 12cc dish

icklemini

100 Posts
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Northampton

30th Mar, 2007 at 10:58:29pm

"My gearbox is 3.21 ratio...sniff "
I have a 3.44 if you fancy doing a swop??
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