Lotus Elan

Rear wishbones Plus 2, worth it?

PostPost by: vincereynard » Tue May 01, 2018 9:24 am

Out of interest, here are the A arms fitted to a TVR 390.
Note the neat toe adjustment.

118-apr.-30-23.35.jpg and


119-apr.-30-23.37.jpg and
vincereynard
Coveted Fifth Gear
Coveted Fifth Gear
 
Posts: 1217
Joined: 12 Jan 2015
Location: amersham

PostPost by: rgh0 » Tue May 01, 2018 10:36 am

Nice design concept

cheers
Rohan
User avatar
rgh0
Coveted Fifth Gear
Coveted Fifth Gear
 
Posts: 7513
Joined: 22 Sep 2003
Location: Melbourne, Australia

PostPost by: MarkDa » Tue May 01, 2018 10:41 am

Maybe neat but if there are bushes at the chassis end you've got a small diameter weld and screwed rod in bending, which is not a good idea.
Racing wishbones get away with adjustability like this because they have rose joints and no rotational resistance.
That's the advantage of the Spyder wishbone - the joint is large and in a low stress area.
MarkDa
Coveted Fifth Gear
Coveted Fifth Gear
 
Posts: 1149
Joined: 15 Apr 2017
Location: Stroud

PostPost by: rgh0 » Tue May 01, 2018 10:48 am

As I said nice "design concept" .... how you implement the detailed design and stress analysis is another mater but not insurmountable to make it suitable. Good engineering is both science and art

cheers
Rohan
User avatar
rgh0
Coveted Fifth Gear
Coveted Fifth Gear
 
Posts: 7513
Joined: 22 Sep 2003
Location: Melbourne, Australia

PostPost by: MarkDa » Tue May 01, 2018 10:56 am

I've been reviewing Spyder's website and they do say that the rear wishbones are powder coated.
I don't think mine were 6 years ago but I don't know what they were saying at the time.
MarkDa
Coveted Fifth Gear
Coveted Fifth Gear
 
Posts: 1149
Joined: 15 Apr 2017
Location: Stroud

PostPost by: vincereynard » Tue May 01, 2018 1:12 pm

MarkDa wrote:Maybe neat but if there are bushes at the chassis end you've got a small diameter weld and screwed rod in bending, which is not a good idea.
Racing wishbones get away with adjustability like this because they have rose joints and no rotational resistance.
That's the advantage of the Spyder wishbone - the joint is large and in a low stress area.


Coming from someone who has a pair of Spyder adjustables I don't think a design that puts strain on every welded joint is exactly inspired.

Besides the TVR arms take the grunt from a (435 Nm torque) 4.5 Rover V8 without a problem, so I doubt
an Elan would bother them.
vincereynard
Coveted Fifth Gear
Coveted Fifth Gear
 
Posts: 1217
Joined: 12 Jan 2015
Location: amersham
Previous

Total Online:

Users browsing this forum: alan.barker, reb53 and 13 guests