Lotus Elan

Chapman struts required!

PostPost by: vxah » Tue May 21, 2019 1:06 pm

Does anyone have a pair of issue 18 rear struts that they would part with? I have taken mine apart and whoever has been at it before must have been an absolute bodger! Snap ring grooves broken, threads stripped, taper worn where it has spun and been refitted with Loctite or something!
I say issue 18, is that what a 69 S4 would have? I have one 18 and one early with the smaller bearing!
Need something more rebuildable if anyone can help?

Julian.
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PostPost by: William2 » Tue May 21, 2019 4:27 pm

I think Paul Matty stocks new ones.
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PostPost by: mark030358 » Tue May 21, 2019 6:36 pm

As does TTR
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PostPost by: jono » Tue May 21, 2019 7:15 pm

I have an early (narrow bearing) issue 16? right hand hub housing with very good bearing housing and circlip grooves if it's any interest.

You'll need a strut tube but those can be bought much cheaper than a full strut.

Jon
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PostPost by: vxah » Tue May 21, 2019 10:56 pm

Thanks Jon, I’m hoping to find more complete units as my shafts are pretty ropey as well as the housings. The tubes are ok with no rust holes so could maybe re-use them although, I have never tried pressing them out before!
Would an S4 use the same units as a later +2? Ie issue 18?
Ironically a few years ago I cut a good outer shaft in half so I could put it in the lathe and true up the hub flanges for my +2!
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PostPost by: 2cams70 » Wed May 22, 2019 2:13 am

Anal retentive here!! Sorry but I hate the term "Chapman strut". Colin Chapman did a lot of great things but he should not be credited with this. A "Chapman strut" is just a McPherson strut used at the rear of the car rather than the front. Lotus Elan "Chapman struts" are derived from Ford Anglia "McPherson struts".
Earl McPherson is the real hero and came up with the idea whilst working for GM in the USA. GM said it was a load of rubbish and could see no use for it (why does that not surprise me!). Consequently McPherson took a job with Ford Europe. Ford adopted the idea for their 1950's Consul/Zepher range and the rest as they say is history. McPherson struts are still a popular choice for many modern suspension designs.
1970 Ford Escort Twin Cam
1972 Ford Escort GT1600 Twin Cam
1980 Ford Escort 2.0 Ghia
Peugeot 505 GTI Wagons (5spdx1) (Autox1)
2015 Honda City 5spd.
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PostPost by: englishmaninwales » Wed May 22, 2019 7:38 am

The rear strut in the Elan discussion:
viewtopic.php?f=42&t=24055
1966 Elan S3 Coupe
1994 Caterham 7
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PostPost by: Elanintheforest » Wed May 22, 2019 7:55 am

Julian, have you tried Spyder Cars for a 2nd hand strut? When they were converting loads of Plus 2 cars they had a pile of old struts available, but I don't know if they still do the conversions in such quantity any more.
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PostPost by: Jentwistle3 » Wed May 22, 2019 7:46 pm

>>>Anal retentive here!! <<<

Agreed

>>>Sorry but I hate the term "Chapman strut". <<<

And we care.... why???
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PostPost by: pharriso » Wed May 22, 2019 9:14 pm

Sorry guys, anal-retentive or not, the Elan does not have "chapman struts"; the latter is defined as "a long upright strut combining a coil spring and shock absorber, with a universal-jointed drive shaft itself forming the lower link of the suspension."

The drive shafts of an elan have zero suspension function apart from additional spring rate from the doughnuts. That's what your "A" frames are there for!
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PostPost by: vxah » Wed May 22, 2019 10:59 pm

Sorry people, I only called them what most people call them and you did know what part I meant :D
I’m off to do the hoovering now, sorry no the vacuuming :|
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PostPost by: Elanman99 » Thu May 23, 2019 2:23 pm

pharriso wrote:Sorry guys, anal-retentive or not, the Elan does not have "chapman struts"; the latter is defined as "a long upright strut combining a coil spring and shock absorber, with a universal-jointed drive shaft itself forming the lower link of the suspension."

The drive shafts of an elan have zero suspension function apart from additional spring rate from the doughnuts. That's what your "A" frames are there for!


Have I understood what you said correctly? That there is such a thing as a 'Chapman strut' but only when a strut is combined with the drive shaft being part of the suspension?

Ian
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PostPost by: vincereynard » Thu May 23, 2019 2:43 pm

Elanman99 wrote:Have I understood what you said correctly? That there is such a thing as a 'Chapman strut' but only when a strut is combined with the drive shaft being part of the suspension?

Ian


I think Phil is correct. As on a type 14 Elite.
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PostPost by: pharriso » Thu May 23, 2019 6:13 pm

Elanman99 wrote:
pharriso wrote:Have I understood what you said correctly? That there is such a thing as a 'Chapman strut' but only when a strut is combined with the drive shaft being part of the suspension?

Ian

Yes, there is no lower A frame or any lower wishbones. The driveshaft stops the wheel / hub moving in or out. :shock:
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PostPost by: Spyder fan » Thu May 23, 2019 7:57 pm

A Chapman strut

Image

Spyder had quite a few type 18 rear uprights a few years back, a few of the better condition ones were sold off, I kept mine for a while, but parted with them when I had a clear out. It’s worth calling Sean at Spyder to see if they have anything at the moment, they have done quite a few Zetec conversions in the last couple of years but the donor vehicles are quite often basket cases or incomplete bodyshells these days.
Kindest regards

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