Lotus Elan

Castor angle

PostPost by: Foxie » Wed Apr 18, 2018 1:04 am

Just now I'm setting up my recently fitted Spyder adjustable front upper wishbones. My castor with equal settings was way off, -0.28' lhs, + 0.04' rhs, i.e. one side negative, and the other about zero :shock:

My Autobooks Lotus Elan/Lotus Elan +2 manual Tech Data quotes the castor as "Early, 7 degs ; later 3 degs + 5 degs" (I think this typo should read 0.5 degs)

My original Lotus manual for the Plus 2, Section C, Front Suspension, P6, shows 3 degs + 30'

I'm shooting for 3 degs and I'm looking forward to see how it works out. :)

Has anyone any knowlege on why the change was made from from 7 to 3 degs ?
68 Elan +2, 70 Elan +2s
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PostPost by: prezoom » Wed Apr 18, 2018 3:33 am

The more caster, the harder it is to turn the steering wheel when stopped or a very low speeds, like parking. Perhaps there were complaints?
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PostPost by: nomad » Wed Apr 18, 2018 4:38 pm

Also, the more castor the more the car wants to drive in a straight line....something that modern cars don't like to do at all! :D

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PostPost by: prezoom » Wed Apr 18, 2018 10:24 pm

There is also the saying, " Caster is faster". You can run less negative camber for increased speeds on the straights, and when turning into a corner, the caster will increase the negative camber.
Rob Walker
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1964 Sabra GT
1964 Elva Mk4T Coupe (awaiting restoration)
1965 Ford Falcon Ranchero, 302,AOD,9",rack and pinion,disc,etc,etc,etc
1954 Nash Healey LeMans Coupe

Owning a Lotus will get you off the couch
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PostPost by: nomad » Thu Apr 19, 2018 1:30 pm

prezoom wrote:There is also the saying, " Caster is faster". You can run less negative camber for increased speeds on the straights, and when turning into a corner, the caster will increase the negative camber.


That never occurred to me but makes sense!

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