In reply to a message from Frank Andersen sent Wed 6 Feb 2013:
The specs given is the ‘total’, ie from ‘straight’, ‘0’
toe, the front should be within 1,6 mm narrower and the
rear some 1,6 mm.
Many thanks Frank.
It appears that Haynes gives ‘early’ specs (toe out) the
ROM the revised specs (toe in) and both mean ‘per side’,
whereas it is common (?) to speak of a total difference
measured between front and rear of the rims, like Al does.
Or Jaguar doubled these specs somewhere in the past.
Anyway, I’ll set it up like you said.
It’s very impractical to measure the toe-in individually for each wheel,
…or was, prior to the advent of electronic alignment - which usually uses
degrees in relation to the car’s centre line. The toe complements the castor
angle in keeping the car running straight. With toe-in; as one wheel is
running ‘straight’ the other wheel runs at an angle, which causes greater
rolling resistance - pulling the steering wheel to ‘straight ahead’ as
well…providing the track rods are equal, but encourages the car to go
straight anyway. There are some other drawbacks of unequal track rods, but
within reason they are minor, related to some bump steer and some effect on
wheel tracking during turns…
With neutral toe, the responsibility of ‘straight’ falls on the castor
angle - which is perfectly adequate to do so, though the car may feel a bit
more twitchy. With toe-out the geometry fights the castor effects - but the
castor effect still wins…
xj6 85 Sov Europe (UK/NZ)-----Original Message-----
From: Michiel Mooij
Sent: Thursday, February 07, 2013 6:34 PM
Subject: Re: [xj] '79 Series II XJ12 toe-in/out specifications
The archives and FAQ will answer many queries on the XJ series…
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