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 Post subject: gearbox ID
PostPosted: Thu Dec 13, 2018 4:46 am 
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848cc
848cc
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Joined: Fri Jul 21, 2017 1:14 pm
Posts: 303
Location: Branxton, NSW
Hi, I bought a 1098 engine and box 10yctah (mini K i think??) and a 22g1128 box. Is the box anything special? would it have close ratio gears or not? does it matter? Cheers

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1972 Mk3 Mini 1000, 1150cc supercharged.
https://www.ausmini.com/forums/viewtopic.php?f=3&t=95872


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 Post subject: Re: gearbox ID
PostPosted: Thu Dec 13, 2018 6:18 am 
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Joined: Fri Mar 19, 2004 6:19 pm
Posts: 39616
Location: near Baulkham Hills, NSW
Gearbox is a Mini K 4 synchro remote shift. It would have standard ratios. Cooper S 1st motion shaft and cluster gear can be fitted but cost over $400 now. Only gives 1/17 increase in 1-2-3 gear speeds.

Much cheaper to fit a 3.1 diff instead ,which will make 1-2-3 overall ratios the same. With 4th gear taller for cruising.
Assuming the 1098 will pull it, this is no problem with a 1275.

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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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 Post subject: Re: gearbox ID
PostPosted: Thu Dec 13, 2018 3:01 pm 
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1275cc
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Joined: Sat Feb 09, 2013 5:44 pm
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Location: Camden
Apart from the 1st motion shaft, cluster gear, final drive ratio and diff drive, the mini K box is the same at the Mk2 S box. All the shafts and bearings and most of the intermediate gears are identical.
With the changes drmini has mentioned you have a Mk2 S box - they are the same casting and internal dimensions.

I fitted a 1275 cc low compression motor to my mini K and kept the original gearbox and final drive(3.765). It went very well with quick acceleration low down but busy at highway cruising.
Later fitted a 3.44 final drive which didn't make a big difference to the cruising or noise. I think minis are noisy at any speed.


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 Post subject: Re: gearbox ID
PostPosted: Thu Dec 13, 2018 6:49 pm 
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848cc
848cc
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Joined: Fri Jul 21, 2017 1:14 pm
Posts: 303
Location: Branxton, NSW
Thanks guys, I'll just run it with the gears that are in it, I assume 3.44 diff which should be fine (if not I have the gears to change it). I'm going to do a 'project smallbore' of sorts on the engine so it should pull it all ok.

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1972 Mk3 Mini 1000, 1150cc supercharged.
https://www.ausmini.com/forums/viewtopic.php?f=3&t=95872


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 Post subject: Re: gearbox ID
PostPosted: Fri Dec 14, 2018 10:43 am 
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Joined: Fri Mar 19, 2004 6:19 pm
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Location: near Baulkham Hills, NSW
If original it would have either a 3.76 diff or perhaps a 3.64 (as early 1098 Clubby got).

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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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