Vehicle & Technical > Defender

2" lift. Dumb question number 3

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datalas:
Tigger and Piglet are both on QT radius arms, and I have a set sat in Tim's garage waiting for them to be bolted to my 90 when I get it built.

I'll be at Abingdon, so will muddy, so you should be able to get a profesional opinion (and my opinion too)

littlepow:
What the legality of running with uncorrected castor anglea, in terms of insurance liability?

As the steering is effected can insurance companies refuse to pay if involved in an accident. Obviously this is taking into account that they have knowledge of the changes to suspension.

datalas:
Theoretically, since you have informed them of the modifications you should be covered.

However, the onus would be on you to get the insurance company to certify that your vehicle is covered, with the declared modifications.  If they have any questions regarding the technical expertise of the modifications then they should be directed to you so that you can provide satisfaction..

Although, you probably need to talk to your insurance company.

Range Rover Blues:

--- Quote from: "datalas" ---
Castor correction (via the radius arms) bend the axle back to the flat,  this will sadly move the diff with it, thus increasing the angle and the strain on your propshafts.  However this usually only exhibits itself as a strain on the front one since the rear is longer.

--- End quote ---


Also the rear axle is supported by a different type of suspension and moves nearly parallel in all but extreme lifts, so the angle in the 2 UJs increase roughly the same amount.  That said I was looking at a motor with a 5" lift this afternoon and the rear diff was slightly too nose-up for the prop to be 'happy'.

The front prop on any coiler is unusaul in that a standard car does not have the gearbox flange and axle flange parallel, although the 2 ujs drive through roughly 3 degrees each thus balancing one another.  When you lift the car only the gearbox UJ increases in angle, leading to the imbalance that causes the pulsing.  Castor correcting arms effectively straighten out the axle UJ, making things worse, hence the Cardan jointed or TD5 prop.

Incidentally I was looking into getting castor corrected swivels from Tomcat motorsprot but they are 6 degree corrected ie a 4"lift and too much castor is as bad than not enough, possibly worse.

I think it's time for an in-depth article on lifting coilers.

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