allegro engine/box (gear ratios)
Turbo Mini Forums

hi, i bought an allegro engine/box for a mini. does anyone know if the gear ratios in the box wil be too low for use in a mini? some random guy has emailed me asking to have the gearbox as the top end will only be 50mph in a mini,then asking to buy the box. seemes a stupid claim to me, thought id check though.

pretty sure the allegro's do have a high final drive in them, 3.7 or 3.9 maybe?

if I recall right the 1100 had a 4.1 final drive and the 1275 had a 3.9

Can you count the teeth?

Don't think there ever was an A-series with anything lower than 3.9 fitted.

But yes, it will have a 3.9 in it. Too low for a road going Mini.

good for acceleration though?

4.somthing rings a bell with me,

the maths seems to suggest this too if you assume 165/80/13's

I once had a 3.9 diff in my road mini clubman estate, it was by accident rather than on purpose, top speed about 75mph....

Vegard is correct again:)

NOOOOOO! lol

Hi,
I had an 1100 allegro engine and box in a mini once.
1st is used for spinning tyres, second used to pull away and as Tom says about 70 flat out !
Cheers,
Gavin :)

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all you need is some 14" wheels and you'll be fine

try this link
http://www.carfolio.com/specifications/mod...-specifications

its the diff ratio rather then the ratios of the gearset though?

Yes. all the standard gearboxes are direct drive 4th.

no good on 13' wheels then? not a problem to change a diff anyway..

it will be fine on 13's if you want acceleration at the expense of top end speed. If you are looking for something a bit more friendly for motorways etc then change the diff for something higher.

I ran a 3.7 in an MG engine with a kent 286 with 12's and it was fine but I was just bodding about town.

3.627 2.172 1.412 1.00 3.444 Mini 1000 1967
3.330 2.094 1.353 1.00 3.647 1300 GT 1967
3.330 2.094 1.353 1.00 3.647 MG 1300 1967
3.330 2.094 1.353 1.00 3.647 Riley Kestrel 1967
3.525 2.218 1.433 1.00 3.444 Mini 1000 1968
3.525 2.218 1.433 1.00 3.647 1300 1967
B-box now with new 3.525 2.218 1.433 1.00 3.765 All 848 Minis 1968 Diaphragm
synchromesh on 1,2 3.525 2.218 1.433 1.00 3.444 Mini 1000 1968
3 and 4. 3.330 2.094 1.353 1.00 3.444 Cooper S 1968
3.525 2.218 1.433 1.00 3.444 Clubman 1969
3.330 2.094 1.353 1.00 3.647 1275 GT 1969
3.525 2.218 1.433 1.00 4.133 1100 1969
3.525 2.218 1.433 1.00 3.647 1300 1969
3.330 2.94 1.353 1.00 3.647 1300 GT models 1969
B-box as above 3.330 2.094 1.353 1.00 3.444 1275 Gt 1970/1 Diaphragm
B-box with new rod ALL RATIOS REMAIN THE SAME ON ALL MODELS 1972/3 Diaphragm
gear change AS SHOWN ABOVE
New B-box 3.525 2.218 1.433 1.00 3.444 Clubman now 1975 Diaphragm
1098 cc
B-box with rod 3.525 2.218 1.433 1.00 4.133 Allegro 1100 1973 Diaphragm
change 3.525 2.218 1.433 1.00 3.938 Allegro 1300 1973

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Acceleration with a 3,9 and std gearbox will NOT be good. The reason is that you empty 1st so early. I bet 0-60 is faster in 2nd with a little clutch slip.

agreed if you are accelerating form a standing start but on the road, most of the driving will be in 3rd & 4th