From: "Jeff W. Kimbrell" <kimbrelltr4@yahoo.com>
> I own a 1962 TR4. The specification for the camber on the front end is listed
>as
> 2 degrees positive in the repair manual.
Yes, to match the camber pull of the the toe-in. Give a nice, stable steering
on the highway.
> However I have noticed several parts
> offered which can give you a fixed, or adjustable negative camber setting .
Interesting. Where did you see this? Most parts I see are for the TR4A and
the cars that followed.
> My
> question is if there is a handling advantage in changing from the stock
> specification to the negative setting ?
Absolutely. Positive camber is awful for cornering. The concept is that you
want to use the whole face f the tire tread evenly. This means that the
dynamic camber (the camber that you have on the outside wheel while actually
cornering) should be zero or a bit negative.
An unequal-length upper/lower wishbone suspension is designed to make the
camber go more negative as the car leans. This effect is measured by a "camber
curve".
The camber curve on a TR4 is not going to go negative enough to cancel out both
the positive static camber and the tilting of the chassis. A big front swaybar
helps (and has the added happy effect of nailing down the inside front wheel),
by lessening body roll.
If you start with a negative static camber, you can tune the car to have an
optimal dynamic camber. You want to match that negative camber with a bit of
toe-out to lessen tire wear on the highway. You steering will not be the
solid, stable setup that was designed-in, but a darty responsive type ideal for
autocrossing but more tiring on long freeway drives.
These camber parts are not likely to be legal for Vintage Triumph Register
stock-category autocrossing, but the sway bar is...
--
Phil Ethier West Side Saint Paul Minnesota USA
62 Triumph TR4 CT2846L, 07 Saturn Ion 3 2.4, 93 Suburban, 94 Miata C-package,
79 Caterham 7
pethier [at] comcast [dot] net http://forum.mnautox.com/forums/
http://www.flickr.com/photos/pethier
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