Lotus Elan

6-Speed Gearbox

PostPost by: gav » Mon Jan 23, 2023 2:26 pm

Interesting

I saw the 6 speed ratios in the earlier thread (first doesn’t look great). Do we know the 5 speed ratios or have I missed them? The Caterham site doesn’t seem to divulge any info on them.

Thanks
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PostPost by: RobertMaulden » Mon Jan 23, 2023 3:26 pm

jono wrote:For anyone interested in ZF, Wayne Lee is your man (based a few miles from me and probably the World's leading authority - even ZF in Germany call him for advice!):

https://www.motorsporttransmissions.com/home


Correct. All my rally car mates have had their original ZF boxes rebuilt by him. He is also the remanufacturer for new boxes (note - some parts from the new boxes are not interchangeable into the original boxes)

Interested to see the current price in an earlier post!
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PostPost by: jono » Mon Jan 23, 2023 4:12 pm

RobertMaulden wrote:
jono wrote:For anyone interested in ZF, Wayne Lee is your man (based a few miles from me and probably the World's leading authority - even ZF in Germany call him for advice!):

https://www.motorsporttransmissions.com/home


Correct. All my rally car mates have had their original ZF boxes rebuilt by him. He is also the remanufacturer for new boxes (note - some parts from the new boxes are not interchangeable into the original boxes)

Interested to see the current price in an earlier post!


I know Wayne personally and he's a top bloke (go the same pub).

I used his courier account to send a 2000E box and diff to the USA a few years ago, to SENC I think.
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PostPost by: innesw » Mon Jan 23, 2023 4:35 pm

gav wrote:Interesting

I saw the 6 speed ratios in the earlier thread (first doesn’t look great). Do we know the 5 speed ratios or have I missed them? The Caterham site doesn’t seem to divulge any info on them.

Thanks
Gavin


I found this article on the Caterham box which states the below -
https://lowflying.lotus7.club/2015/2015 ... earbox.pdf

Mazda 5 speed ratios are:
1st 3.136
2nd 1.888
3rd 1.330
4th 1.000
5th 0.814

However if you look deeper these are the exact same ratios as the mk1 mx5, so don't know if they are accurate, tread with caution .etc
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PostPost by: innesw » Mon Jan 23, 2023 4:37 pm

Ianashdown wrote:Not wanting to hijack staggmutt’s thread on the 5-speed conversion I thought I’d start a new thread.

The Ainsin AX6 transmission, used in the MX5



Do you mean the Aisin AZ6 Gearbox Ian?
Not intending to hijack your thread and trying to bring it back on course!

Cheers,
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PostPost by: Ianashdown » Mon Jan 23, 2023 6:56 pm

Yes, that would be the ‘donor’ unit, if Ainsin will play nicely with us. Then new bellhousing, maybe 3D printed, and new tail casting. Everything in the right place, right length etc.

At least that’s the target!

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PostPost by: englishmaninwales » Tue Jan 24, 2023 11:27 am

jono wrote:Has anyone considered the Caterham 6 speed? - a lovely box with great ratios.


Don’t forget that 6th gear is 1:1 so you won’t have an overdrive with no improvement for cruise, and as said, you might as well go for a Voight’s 5 speed.

(It was designed by BGH for Caterham for the relatively undertorqued 1400/1600 K Series powered Caterhams in the 1990s - a delight to use with those engines.)
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PostPost by: jono » Tue Jan 24, 2023 12:51 pm

englishmaninwales wrote:
jono wrote:Has anyone considered the Caterham 6 speed? - a lovely box with great ratios.


Don’t forget that 6th gear is 1:1 so you won’t have an overdrive with no improvement for cruise, and as said, you might as well go for a Voight’s 5 speed.

(It was designed by BGH for Caterham for the relatively undertorqued 1400/1600 K Series powered Caterhams in the 1990s - a delight to use with those engines.)


Ah, yes I'd forgotten the direct final ratio.

I had a 1.4SS with the 6 speed box and it was so much fun. ISTR it was designed by Mark Kinman, the gearbox guy who got arrested for making guns on the side. Using some LR parts
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PostPost by: englishmaninwales » Tue Jan 24, 2023 1:40 pm

Indeed, a very nice combination.
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