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74Club-man
 Post subject: Quick diff question.
PostPosted: Tue Dec 02, 2014 3:46 pm 
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Sounding like a newbie, what's the pro's and con's of both 3.4 and 3.7 crown-wheels??

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drmini in aust
 Post subject: Re: Quick diff question.
PostPosted: Tue Dec 02, 2014 5:59 pm 
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3.44 is good for a road car, as long as the motor is a 1098 or bigger.
3.76 was fitted stock on 850, 997/998 Cooper and 998 Mini Deluxe, is also used in group Nb race cars. It's a bit busy for cruising with a big motor.

In between there is a 3.647, was fitted to most Mini K and 1100 Clubbies using the remote box.

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74Club-man
 Post subject: Re: Quick diff question.
PostPosted: Tue Dec 02, 2014 6:36 pm 
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So a 3.76 (22g401) is best for a standard 998?
If so it looks like I have a 22g411 to sell.

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Kennomini
 Post subject: Re: Quick diff question.
PostPosted: Tue Dec 02, 2014 7:30 pm 
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Basically the higher the number the more revs you'll be doing at 100km/h. Or to put it another way the faster you'll accelerate off the line.

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drmini in aust
 Post subject: Re: Quick diff question.
PostPosted: Tue Dec 02, 2014 8:14 pm 
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74Club-man wrote:
So a 3.76 (22g401) is best for a standard 998?
If so it looks like I have a 22g411 to sell.


3.44 was used in most Mini rodchange boxes, including the 998 from 1975 on.
A 3.76 is better for going up hills with a 998 though. :wink:

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. :mrgreen:
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74Club-man
 Post subject: Re: Quick diff question.
PostPosted: Wed Dec 03, 2014 6:36 am 
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Thanks guys.

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1071 S
 Post subject: Re: Quick diff question.
PostPosted: Wed Dec 03, 2014 8:58 am 
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Like Doc says... but consider carefully what you intend to do ... and where you live.

A 3.7 will blunt the acceleration edge and require an earlier downshift on hills.

The upside is a much more relaxed car if you spend any amount of time on the freeway/highway..

Cheers, Ian

Oh, and BTW, its not just the crown wheel involved in ratio change..
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drmini in aust
 Post subject: Re: Quick diff question.
PostPosted: Wed Dec 03, 2014 10:05 am 
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1071 S wrote:
Like Doc says... but consider carefully what you intend to do ... and where you live.

A 3.7 will blunt the acceleration edge and require an earlier downshift on hills.

The upside is a much more relaxed car if you spend any amount of time on the freeway/highway..

Cheers, Ian

Oh, and BTW, its not just the crown wheel involved in ratio change..

Ian you got that statement arse about... :)

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9YaTaH
 Post subject: Re: Quick diff question.
PostPosted: Wed Dec 03, 2014 10:46 am 
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74Club-man wrote:
So a 3.76 (22g401) is best for a standard 998?
If so it looks like I have a 22g411 to sell.


Why? just tickle the engine a little so that it will pull the higher diff and enjoy the lower revs when cruising...(if that is your thing and the type of work the car does).

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1071 S
 Post subject: Re: Quick diff question.
PostPosted: Wed Dec 03, 2014 11:37 am 
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drmini in aust wrote:
1071 S wrote:
Like Doc says... but consider carefully what you intend to do ... and where you live.

A 3.7 will blunt the acceleration edge and require an earlier downshift on hills.

The upside is a much more relaxed car if you spend any amount of time on the freeway/highway..

Cheers, Ian

Oh, and BTW, its not just the crown wheel involved in ratio change..

Ian you got that statement arse about... :)


Not a big problem ...only the numbers are wrong.... and I got the three correct :oops:

But just to remove confusion.. I should have typed "3.44"

Cheers...
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74Club-man
 Post subject: Re: Quick diff question.
PostPosted: Wed Dec 03, 2014 2:43 pm 
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Ok so snap question, what is the best diff ratio for a stage one 998 to be used for shows and general Sunday cruising???

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drmini in aust
 Post subject: Re: Quick diff question.
PostPosted: Wed Dec 03, 2014 2:59 pm 
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3.44 then. :)

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74Club-man
 Post subject: Re: Quick diff question.
PostPosted: Wed Dec 03, 2014 6:05 pm 
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Location: Ipswich
Thanks drmini.

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