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Low diff ratio

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Low diff ratio
Austin in the Shed Offline
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#11
04-06-2019, 05:18 PM
Isn't it 5.625, 8x45 teeth ?
The Big 7 diff is different in that the 1/2 shafts are larger requiring  special bearings,(Reduced o/d I think) either side of diff to fit and boring out of the side tubes, I don't think the CWP ratio was any lower either ?
If you are running a 4 sp box you wouldn't need that low a ratio.
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Steve Jones Offline
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Location: North Yorkshire
#12
04-06-2019, 05:22 PM (This post was last modified: 04-06-2019, 05:24 PM by Steve Jones.)
(04-06-2019, 04:50 PM)Rogerfrench Wrote: Steve, you can't get 5.67 with a 7 tooth pinion. David Cochrane's website quotes 6 teeth,  6:34 to be precise.

Oops! Never could count!!

Steve
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Greig Smith Offline
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Location: Port Elizabeth, Sunny South Africa
Car type: '26 Chummy, '28 Top Hat, '33 Type "65", single seaters
#13
04-06-2019, 05:48 PM
(04-06-2019, 01:10 PM)Steve Jones Wrote: David Cochrane's 5.67:1 is the one to go for, Greg. The trouble with the Austin 5.65:1 sets is that the teeth are quite thin being 8:45 but in the same overall dimension CWP as the 5.25:1 with 8:42 teeth. David's 5.67:1 sets use a 7 tooth pinion which means a much more robust unit. I've used a set in my trials Chummy for many years having destroyed an Austin 5.65 set in about 18 months of trialing. I've fitted a further 5.67 to my hill climb Ulster for this season also.
Steve

Thanks for that info Steve, reassuring that you have had good success with the parts

Aye
Greig
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