14 replies to this topic

[skaterava]

Hi guys, i'm taking a gap year so i'm planning on having my gearbox reconditioned and the final drive ratio adjusted to make dual carriageway/motorway cruising a bit easier. First off, what is the standard FDR for a 1987 998cc Mini? And what would you reccommend as a good drive ratio to compromise both top end cruising and acceleration? thanks

[lrostoke]

If you put you engine number into Guessworks page here

http://www.guess-wor...ical/engine.htm

It should give you a lot of detail including ratio.

Think mine came out at 2.95 : 1 thats on a 998, seems a good ratio for mine, good accelaration and no worries on motorways.

Edited by lrostoke, 18 September 2009 - 06:38 AM.

[bmcecosse]

998 s never had 2.95 final drive!! 3.44 is probably standard but it may have the 3.1 if economy model. Note some have economy ratio drop gears fitted too.

[lrostoke]

Guess the database isn't that accurate then

I've entered the engine number a few times got same results 2.95 : 1

checked a few other sources they also say 2.95 : 1

99H/997
1980 onwards A+ block, flat top pistons, economy fitment with 2.95 final drive

Edited by lrostoke, 18 September 2009 - 10:47 AM.

[maph2]

2.95 is sportpack IIRC hence why acceleration is a bit lethargic

[AndrewJ530]

998 s never had 2.95 final drive!! 3.44 is probably standard but it may have the 3.1 if economy model. Note some have economy ratio drop gears fitted too.

The mini 25 had a final drive of 2.95 and that was a 998.

[Asphalt]

998 s never had 2.95 final drive!! 3.44 is probably standard but it may have the 3.1 if economy model. Note some have economy ratio drop gears fitted too.

The mini 25 had a final drive of 2.95 and that was a 998.

Some mid 80s 998 Minis had them (my Mayfair Sport too!) indeed.
MPIs got the even longer 2.76:1 FD.
Most late(ish) 998 got a 3.11:1 diff.

If you'r lucky, you find a sticker on top of the diff telling the teeth of pinion/crown wheel.

With 10" wheels I found a 3.21:1 diff ratio to be the best compromise for all purposes.
For long journeys and much motorway use a 3.11 or 2.95 is a good choice.
For acceleration & fun - 3.44 or even 3.65.

A handy tool to compare diff vs. speed&RPM is this:
http://www.mini-mayf.../daten/Gear.exe

[lrostoke]

Some mid 80s 998 Minis had them (my Mayfair Sport too!) indeed.
MPIs got the even longer 2.76:1 FD.
Most late(ish) 998 got a 3.11:1 diff.

That tallies with mine then its 1984.

[maph2]

998 s never had 2.95 final drive!! 3.44 is probably standard but it may have the 3.1 if economy model. Note some have economy ratio drop gears fitted too.

The mini 25 had a final drive of 2.95 and that was a 998.

Some mid 80s 998 Minis had them (my Mayfair Sport too!) indeed.
MPIs got the even longer 2.76:1 FD.
Most late(ish) 998 got a 3.11:1 diff.

If you'r lucky, you find a sticker on top of the diff telling the teeth of pinion/crown wheel.

With 10" wheels I found a 3.21:1 diff ratio to be the best compromise for all purposes.
For long journeys and much motorway use a 3.11 or 2.95 is a good choice.
For acceleration & fun - 3.44 or even 3.65.

A handy tool to compare diff vs. speed&RPM is this:
http://www.mini-mayf.../daten/Gear.exe

he's right /\ /\

mPi is 2.76...dunno why i said 2.95. povo spec is 2.95 minis and most 998's

3.2 is metro turbo IIRC and the best allrounder.

[Asphalt]

3.2 is metro turbo IIRC and the best allrounder.

Yepp! + some SPIs (at least german market models got them, mostly 63HP models)

[taffy1967]

998 s never had 2.95 final drive!! 3.44 is probably standard but it may have the 3.1 if economy model. Note some have economy ratio drop gears fitted too.

After the Mini got the A+ engine in 1982, the only Minis to get the 3.44 final drive as standard were the 1990 versions of the Mini Flame Red, Racing Green and the Mini Check Mate.

[MRA]

Some 998's did get a 2.95:1
and most MPI's got a 2.76:1

All Later auto's had a 2.76:1 however auto and manual crown wheel and pinion's are NOT compatible...

[Ethel]

3.44 up to the A+

2.95 for A+'s on 10's
3.1 for A+'s on 12's

You could also have a 3.44 or 3.6 out of a Metro

[taffy1967]

I'm pretty sure the mid 1980's Mini City E and Mini 25 LE got the 2.95 final drive too. Even though they were riding on 12" wheels.

Edited by taffy1967, 19 September 2009 - 11:10 PM.

[mwalsh]

So what would be the gearset ratios typically be in the A+ gearboxes you'd find on these 998cc Minis fitted with a 2.95 fd? Would they be the same as the Metro "economy" gear set listed below:

1st gear = 4.004:1
2nd = 2.307:1
3rd = 1.435:1
4th =1:1