16 replies to this topic

[maystro]

Hi guys,

 

I had a 998 A+ motor and now just purchased a 1293 A+ motor from minispares using my existing gearbox and diff which has a final ratio of 4.33.  This would be great if I wanted to be a traffic light warrior but I plan on doing some road trips.  

Any recommendations of  what Crown and pinion ratio I should be looking at and also are A+ crown and pinions the same for pre A+ crown and pinion set up so I can use a pre A+ ?

 

Oh also if anyone has a taller diff ratio suitable for my needs for sale, let me know.  

 

 

Thanks Brad

 

[GraemeC]

I would go with a 3.4 or, at a push, a 3.1 if you're planning on doing a lot of cruising.

 

CWP pairs must stay together, but you can happily fit a either an A or an A+ pair to any gearbox.

If you went for something much taller than a 3.1 then you might need to modify the 3rd motion bearing retainer that sits around the pinion if it is an A series gearbox.

[nicklouse]

Hi guys,

 

I had a 998 A+ motor and now just purchased a 1293 A+ motor from minispares using my existing gearbox and diff which has a final ratio of 4.33.  This would be great if I wanted to be a traffic light warrior but I plan on doing some road trips.  

Any recommendations of  what Crown and pinion ratio I should be looking at and also are A+ crown and pinions the same for pre A+ crown and pinion set up so I can use a pre A+ ?

 

Oh also if anyone has a taller diff ratio suitable for my needs for sale, let me know.  

 

 

Thanks Brad

No Mini had a 4.33 final dive (typo)?
 

I would use and have done the standard 3.44. You could go 3.1 but  you need to look at your cam and estimated driving speeds and work out what you want. Guessworks has a good gear/speed calc just put in your drops/gears/final drive and wheel specs and there you are.

[whistler]

Have a look at this link to double check what your existing 998 A+ final drive ratio is. https://www.minimani...s__standard_873

[Midas Mk1]

All depends on cam, power and torque characteristics. For me having ran 5/6 different ratios 3.1 or 3.2, 3.44 ain’t great for prolonged high speed cruising.

[maystro]

Thanks' Whistler,

 

It confirms my findings that I have a 4.33 drive ratio because I have 65 teeth on the crown wheel and 15 teeth on the pinion.  Way too short I reckon for highway cruising.   

 

So does anyone have any taller gears for sale willing to send to Australia?

 

Thanks  Brad

Edited by maystro, 19 May 2021 - 11:07 AM.

[nicklouse]

Thanks' Whistler,

 

It confirms my findings that I have a 4.33 drive ratio because I have 65 teeth on the crown wheel and 15 teeth on the pinion.  Way too short I reckon for highway cruising.   

 

So does anyone have any taller gears for sale willing to send to Australia?

 

Thanks  Brad

If 65 then it should have DAM3645 stamped on it. Never originally fitted to a Mini but was fitted to cars with larger wheels.

 

soooo this is the Moke? What size wheels? As this is going to change many people’s comments as they will be all Mini related.

 

like I said above put the info into Guessworks calculator and play with the FD. Numbers and see what works with your spec.

 

for info what wheel and tyre size is going on?

[Cooperman]

The 4.33 FDR was used in some rally cars, typically the 970 S which would rev to very high numbers but had very little mid-range torque.
The 970 we had used a 4.1 and even that was a bit high for pulling away as it had a 286 cam.

[Magneto]

We have long distances between events (600-900 miles one way is not unusual), so I like the taller ratios, I run a 1293 with the Evo1 cam and it has plenty of torque, so either a 3-1 or even a 2:76 is fine, and I run the much maligned 13" wheels. Cruises at 75 mph and pulls long uphills with no issues. Of the two my preference is the 3-1.......

 

I was OK with my 3:44 on shorter runs of an hour or so, but more than that becomes tedious and annoying. I'm not a stoplight racer, so 0-60 times aren't my thing.....

Edited by Magneto, 19 May 2021 - 03:39 PM.

[alex-95]

I've got a 1293, kent 266 cam and a ported head, I'm running a 3.2 which is very good around the local twisty roads and pretty good on the motorways.

 

 

EDIT - Running on 10" wheels

Edited by alex-95, 20 May 2021 - 12:42 PM.

[Spider]

Guys,

 

I'll just add the missing info here that Brad has a Moke that runs 13" wheels (and a dia for 24").

The standard ratio for this arrangement was 4.2 though the very last had 4.3.

To put this in perspective, a Moke with 4.2:1 does the same engine / road speed as a Mini with 3.4:1 (ir circa 16 mph / 1000 rpm).

After trying ratios from 3.9, 4, 4.1, 4.2 and 4.3, I run a 4.1 in mine and love it.

[maystro]

Thanks Chris for adding the extra info.

 

Sorry guy's I wasn't aware you didn't know I drove a Moke but I guess how would you so I just updated my profile pic and info.  I'm definitely not apologising for driving a Moke, best car ever when you live in sunny North Queensland....sorry to rub that in

 

I think I will stick with my 4.3 diff ratio since most of my driving will be around town at 60 km/hr also the fact that I can't find a crown and pinion anywhere in Australia for sale in the ratio of my preferred range of 3.9-4.1. 

 

Brad

[nicklouse]

Thanks Chris for adding the extra info.

 

Sorry guy's I wasn't aware you didn't know I drove a Moke but I guess how would you so I just updated my profile pic and info.  I'm definitely not apologising for driving a Moke, best car ever when you live in sunny North Queensland....sorry to rub that in

 

I think I will stick with my 4.3 diff ratio since most of my driving will be around town at 60 km/hr also the fact that I can't find a crown and pinion anywhere in Australia for sale in the ratio of my preferred range of 3.9-4.1. 

 

Brad

As to not knowing you have a Moke. Some did. But also many people have more than one Mini based car.

 

anyway guess what I have sitting on a shelf here in the UK……

[maystro]

Hi Nick,

 

Probably the exact crown wheel and pinion I need?   That hurts but I guess I deserved it after making the sunny North Queensland remark

 

Brad

[whistler]

Guys,

 

I'll just add the missing info here that Brad has a Moke that runs 13" wheels (and a dia for 24").

The standard ratio for this arrangement was 4.2 though the very last had 4.3.

To put this in perspective, a Moke with 4.2:1 does the same engine / road speed as a Mini with 3.4:1 (ir circa 16 mph / 1000 rpm).

After trying ratios from 3.9, 4, 4.1, 4.2 and 4.3, I run a 4.1 in mine and love it.

Just an added piece of history. In the 60's the ADO16, Austin/Morris 1100 had a 4.1 FD as standard with 12" wheels. Tyres were 185 profile which made the driving speed/revs about right. Of course when those engines were transplanted into a mini on 10" it made a brilliant acceleration machine for club rallying.