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Post by bnicho on Nov 10, 2009 1:51:59 GMT
Hi,
Does anyone know of a list (online or on paper) of the final drive ratios available with the AP Auto.
For example the Morris 1100/1300 Auto range here in Aus had a 3.27. (equates to a 3.76 overall with the 1.15:1 drop gears)
Did some markets and models had a lower or taller ratio?
Thanks,
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Post by Admin/Founder 2 on Nov 10, 2009 11:37:50 GMT
Hi Brett im not sure i guess the only way would be for us all to have a go at an engine calculator where you can type in your engine number and it tells you you engine,transmission,and final drive specs  Heres what i got for Boris Source Vehicle : Mini Engine type & CC : A+ 1275 cc Transverse mounted Fueling : Single Point Injection, Base, 9.4:1 CR Engine features : 9.4:1 Compression Ratio Catalyst Gearbox features : Automatic Gearbox - MK II b 3.27:1 Final Drive So Boris has the same as yours  I recently spoke to somebody who used to have an Auto who swore blind though that his had somewhere around 3.3-4 range of diff though that was only hearsay  If anybody else want their drivetrain specs try this www.guess-works.com/Gearbox/Technical/engine.htmJust type in your engine number and it should tell you the specs Though there are some it cant decode though i believe hes working on adding new codes Worth a try though  Huggz Jodie |
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Post by jockduck on Nov 10, 2009 11:42:15 GMT
Hi, just been out to the shed to check and my minimatic diff is 22/72 which equals 3.27. same as the Leyland manual which says 14.9 mph/1000 rpm, I would suspect that the 1100/1300s would be different as they had 12'' wheels.
Just checked my 1300/1500 Leyland manual and the 1300 auto was also 22/72 overall ratio 3.76, 16.35 mph/1000rpm.
So a 1300 has the same gearing as a 998 mini just different wheels.
Surely a 1100 auto would struggle on the same gearing as a 1300, even though its a torque meister
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Post by bnicho on Nov 11, 2009 5:44:07 GMT
Surely a 1100 auto would struggle on the same gearing as a 1300, even though its a torque meister According to the 1300 Nomad Auto manual I have, they had a 3.27 Final Drive. Maybe the earlier 1100/1100S had a different ratio? I was guessing that a UK model which run taller wheels, such as an Allegro, would have had a lower (higher numbered) final drive. The site Joloke posted confirms what I thought about my Moke's engine: Metro A+ 1275cc 9.75 Compression, Mark II b Auto with 3.27 final drive. I am running 185/60R13 tyres on the Moke which are around 15% taller diameter than Mini tyres. Basically this gives me roughly the same gearing as a manual Mini (1:1 drop gears) with a 3.2 final drive. While it pulls okay, I would like a lower final drive (higher numbered) to improve acceleration and towing. Yes, I could go to 175/50R13 tyres or even 12" rims, but it makes the Moke look under-tyred with tiny rubber in the huge wheel arches. Also it drops the ground clearance even further. For those not aware, Aussie Mokes 1969 - 1982 had 13 wheels with high profile rubber. eg: 185/70R13. They had a 4.12 final drive to allow this. But they were all manual. Cheers, Brett. |
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Post by Admin/Founder 2 on Nov 11, 2009 10:04:46 GMT
I dont think it has anything to do with the wheel size? Boris left Longbridge on 12" Wheels and has a 3.27:1 Final Drive It would be interesting though to check what the Final Drive is on 850,998,1100, engines though? Im guessing the Austin/Morris 1300/America/Nomad would have a pretty similar spec to the 1275 in Boris? Though i could be wrong? I know the Metro 1275 auto has the same Engine specs as Boris less Fuel Injection Huggz Jodie |
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Post by kalkat on Nov 11, 2009 12:48:25 GMT
As far as I'm aware, there is only one auto final drive. At least I haven't found any information which suggests or lists otherwise. Beyond this suggestion of 'one size fits all' , some people say that the autos differential is diiferent to that of a manual and as such the ratios can't be easily changed using off the shelf parts. I haven't examined this phenomena - yet, but I will be stripping an autobox soon, so I'll hope to be able to get back to you all on this  Emma |
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Post by notamini on Nov 11, 2009 17:40:38 GMT
According to my 1100/1300 workshop manual edition 17, differential ratio [manual box 4.133:1 (15/62)] Automatic [early 1100 3.48:1, later 1100/1300 3.27:1]
So if you can find a '64/'65 1100 automatic, the ratio is a bit better. No idea if the manual will fit. Likely not.
Just a toss-in:
Manual 1300 diff's for Hong Kong, Bolivia and Canary Islands was 3.9:1
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Post by bnicho on Nov 11, 2009 17:46:23 GMT
According to my 1100/1300 workshop manual edition 17, differential ratio [manual box 4.133:1 (15/62)] Automatic [early 1100 3.48:1, later 1100/1300 3.27:1] So if you can find a '64/'65 1100 automatic, the ratio is a bit better. No idea if the manual will fit. Likely not. Just a toss-in: Manual 1300 diff's for Hong Kong, Bolivia and Canary Islands was 3.9:1 Hmm, that's very interesting. I can confirm that manual final drives do not fit Autos. If anyone happens to have a 3.48 final drive for an Auto, I would be very interested in it. Cheers, |
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Post by notamini on Nov 11, 2009 18:16:48 GMT
FYI
My engine will not work with this ID site. The number for engine code is 292B which is not listed.
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Post by Admin/Founder 2 on Nov 11, 2009 18:41:03 GMT
i think it only works with Mini and Metro units at present though i believe he will be adding other A series Codes in the future |
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Post by notamini on Nov 11, 2009 18:55:28 GMT
Thought I would expand on the ID# 292B
292 breaks down into Ra Ub A
(Ra [Exhaust emission control c/w air pump (N. America mostly)] , Ub [Lucas C40 dynamo], A [automatic]), (the B part) Pos Crankcase ventilation.
The entire engine # is 12H 292B H4409.
12H (1275cc transverse), 292B, H (hi compression 8.8:1), 4409 production #.
Anyone know where I might get the Workshop Manual Suppliment # AKD 4957 ?
Cheers,
Mark
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Post by jockduck on Nov 11, 2009 22:26:25 GMT
I am very sure that manual diff gears won't work in an auto the shaft centres are wider on the auto box.
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Post by notamini on Nov 11, 2009 23:00:41 GMT
I have someone asking what what the actual pinion to crown wheel ratio is. They say this may help them determine if there is a different ratio available. Sorry but this jargin is over my head.
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Post by vpmetroste on Nov 15, 2009 15:05:07 GMT
according to that site my carhas a 3.27 final drive & its an mg engine with ap mk2b
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Post by mra-minis on Dec 28, 2009 12:25:15 GMT
Some metro's and later Mini auto's have a 2.76:1 which is very high and better suited to faster quieter driving |
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Post by kiwihcn on Dec 28, 2009 21:37:19 GMT
HI
I can confirm that my 1988 printed Haynes Manual for the BLMC 1100 & 1300 states the final drive as early model auto 1100' s =3.48:1, later model 1100 and all 1275 autos as 3.27:1 .
I have had it apart and my Wolseley 1300 Auto has the 3.27:1
Auto gear ratios were unchanged , I can supply the overall top,third,second,first and reverse for both the early 1100 and the later 1100 /1275 if any one needs it
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Post by bnicho on Dec 28, 2009 23:08:04 GMT
Some metro's and later Mini auto's have a 2.76:1 which is very high and better suited to faster quieter driving I've seen a 2.76 listed for the late metros in a brochure, but assumed it was a misprint. A 2.76 would be painfully, painfully slow to accelerate! |
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Post by mra-minis on Dec 29, 2009 12:24:59 GMT
not if used along side other tweaks |
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Post by bnicho on Dec 30, 2009 0:50:36 GMT
Maybe, but how good would those same tweaks be with a 3.48 or 3.27 diff! |
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Post by mra-minis on Dec 31, 2009 15:41:56 GMT
As proven over the years, a higher final drive means less gear changes whilst also utilising the torque more effectively...... also means less wheelspin off the line...... Of course it's horses for courses...... it really depends on what you as a driver wants out of your Mini / etc If you plan on carrying 4 adults whilst pulling a camping trailer then a lower final drive will be more useful. If on the other hand you plan on turbocharging your auto then a higher final drive will give you much better driveability and improved acceleration, due to reduced gear changes and less wheelspin |
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Post by bnicho on Jan 4, 2010 22:33:11 GMT
If you plan on carrying 4 adults whilst pulling a camping trailer then a lower final drive will be more useful. If on the other hand you plan on turbocharging your auto then a higher final drive will give you much better driveability and improved acceleration, due to reduced gear changes and less wheelspin What if you want both?   My plan for the Moke is ability to take two adults, two kids, and tow a small trailer. Also to have teh option of taller rubber for extra clearance. But the idea of turboing or supercharging has been in the back of my mind for a while. There is an SC12 Toyota suprecharger kit available here that bolts on to the A series.... |
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