Seven rear axle help - LotusTalk - The Lotus Cars Community
 
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post #1 of 6 (permalink) Old 06-03-2015, 08:20 AM Thread Starter
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Seven rear axle help

I have a series 2 chassis that I need to replace the complete rear axle assembly. It had the triumph rear in it and I want to put in the Escort axle. I can't seem to find any sources for a complete axle outside of England. I don't mind having one shipped in to the states but would prefer to get it stateside. Does anyone know of a place I can get one? Has anyone used another axle that is relatively available in the states? I was thinking a tr7 or a 2WD S10. I know I'll have to modify those, but don't really want to narrow the axle down or open the tunnel too much to make it fit. Any insight would be greatly appreciated. Thanks.
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post #2 of 6 (permalink) Old 06-03-2015, 08:24 AM
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Custom axle modification is done often and the services are readily available.
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post #3 of 6 (permalink) Old 06-03-2015, 09:08 AM
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7 Rear axle

Try simplesevens.org
TR-7 rear axle seems to be the way to go with race 7's
Reinforcing the TR-10 axle pretty much only works with skinny tires
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post #4 of 6 (permalink) Old 07-24-2015, 07:58 PM
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I had Chris Beebe redo the Triumph Std 10 axle in SB1788. It got a 4 speed TR7 center section, with LSD, and cut down TR7 axles. Bigger studs had to be put into the housing for the TR7 center section, but it has the same bolt pattern. The drive shaft had to be shortened too. It still runs the same brakes. He also made me up a ball joint A Frame, and some offset trailing arms with rod ends to allow adjustment and clear the tires better. I was going through a lot of rear A frame bushings where it bolts to the axle. Better now though. Oh yeah. He also replaced the built up bolt-on spring perches with some welded ones that are much simpler and lighter. He straightened it and then bent it for a little negative camber. It cost some money and took a while, but I'm happy. I also went to a 3.9 from a 4.1 rear end, which is an improvement. Autocrossing, I have to shift less and overrev less often. It has special stepped studs which keep the tiny stock diameter of the stock nut, and I like that front and rear wheels are still interchangeable using the same nuts and no sleeves. Is the Atlas axle the one you want? I think the English axle in the Cortina is very easy to find and lighter. I think Phil in San Diego has some for sale. You can check at Lotus-Cortina.com, and get on the list.

I've still got a steg-plate though

Last edited by 850 Combat; 07-26-2015 at 06:00 AM.
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post #5 of 6 (permalink) Old 07-25-2015, 09:29 AM
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I have a spare TR Herald axle sitting in front of my garage. It would need bracing and mounts.

If interested PM me.

Cheers,
Kiyoshi

P.S. Located in near San Jose, CA

Lotus events in California - www.gglotus.org
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post #6 of 6 (permalink) Old 07-25-2015, 01:49 PM
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I have the original Standard 10 rear axle in my '62. It has a limited slip differential and Standard axles. I run 185-70x13 RA-1s on 6" wide rims with an 85Hp 109E (1340cc) and the 3-rail close-ratio gearbox. The differential housing has been reinforced back in the mid '60s and has held up very well for me so far.

I bought a pair of axles from Chris Beebe back around 2010 when I rebuilt the suspension on the car. I put new wheel bearings and seals in at that time. I replaced the axles because they were wearing and couldn't hold sufficient press fit (in my opinion) to the wheel bearings.

Bear in mind that if you change to the Cortina/Escort rear axle, the wheel bolt pattern is different than the Standard / Triumph pattern that you have now. The Ford axle has a 4x4.25 bolt circle while the Standard/Triumph has a 4x3.75" pattern. So you will incur additional cost in one of the following forms:

1) A new pair of rims for the rear wheels if you don't mind having two different wheel bolt patterns.
2) A set of adapters for the rear axle if you wish to keep your present wheels.
3) A pair of new hubs for the front spindles and a new set of four wheels if you want to use the Ford bolt pattern all around.

Or as you have already noted, you can go with the TR-7 rear axle set up. It has the advantage of having the same 4x3.75" bolt pattern as the Standard rear axle. So you would only be into it for the cost of the width modification.

Also please note that for replacement axles for the Standard unit, I have heard that the TR-7 axles can be shortened and re-splined at the inboard end to fit.

Another option you might consider is the BLMC Midget/Sprite unit (4x4" bolt circle). these are also sometimes fitted to Sevens. There are limited slip differentials available for these axles. Here is a comparison of the Spridget unit to the Standard out of my car:


Another option to consider is the Datsun LB110/210 (1200 / B210) unit. it has the same bolt pattern was the Ford axle.

The other option that I have looked at is the rear axle from the 1st generation RX7. In late production GSL trim they were fitted with disc brakes. These also have the Ford bolt pattern.

As for the S10 axle, I wouldn't think that is a very good option. Besides the Chevy 5-bolt pattern axles I would guess that the axle assembly itself would be much heavier. If so, that additional unsprung weight would dramatically upset the spring / shock balance of the suspension. Not to mention the overall mass balance of the car.

Just my $0.02.

Ron Schramm

'62 Seven S2
'77 S1 Esprit
'84 Turbo Esprit
'14 Evora
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