Lotus Evora, Service Notes

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Page 5
Lotus Service Notes Section DJ
Camber Adjustment
Camber is the angle from vertical of the wheel when viewed from the rear, and is said to be negative when
the wheel leans inwards at the top (positive when leaning outwards).
The primary purpose of camber is to achieve the maximum efficiency of the tyre under cornering loads and
body roll, with the specification closely allied to a particular wheel/tyre combination. The camber angle changes
with suspension travel, becoming more negative on bump, and should be measured only at the specified ride
height. Incorrect camber can result in handling deficiencies and excessive tyre wear.
Illustration TBA
An eccentric cam at the rear inboard pivot of each lower wishbone provides a means of camber adjust-
ment. The pivot bolt is inserted from the rear, with the bolt head featuring an integral eccentric cam, and with
a corresponding eccentric camplate clamped beneath the nut on the front side of the rear pivot. The camplate
is keyed to the bolt via a tongue and groove feature to ensure alignment between the two cams. Each cam is
constrained by vertical guides in a riveted insert in the subframe, whereas the pivot bolt hole in the subframe
is slotted horizontally. Thus by turning the bolt (and eccentric cams) the wishbone pivot axis may be moved
inboard or outboard.
When adjusting camber, note that the horizontal movement produced is not linear, but accords with simple
harmonic motion. After adjustment, ensure that the pivot bolt is tightened to 86 Nm. Be aware that any camber
adjustment will also affect wheel alignment, which must subsequently be checked and/or reset (see above).
Camber angle
Vertical Wheel centreline
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