Very well put. Also too much caster can cause a shimmying,difficult
sterring and excessive road shock. Too much negative caster can cause
wandering,weaving,and instability at high speeds. Caster should be equal at
both sides with no more than a difference than a 1/2 degree. I always set
the left side a little less because of the road crown on the highway.
Kevin Andrews
Siler City,NC
TR-250's (CD2908LO)
(CD7766L)
----------
> From: Barry Schwartz <bschwartz@encad.com>
> To: triumphs@autox.team.net
> Subject: Castor change -
> Date: Thursday, October 30, 1997 11:30 AM
>
> >And...why would you want to change castor? I'll bet your racing
experiences
> >will show us all why. For street applications, you wouldn't need to
touch
> >it unless there was frame damage and something wasn't right to begin
with.
> >Regards,
> **************************************
> Actually you wouldn't normally want to change castor unless it was out of
> spec. Castor has many effects but mainly it influences the ability of
the
> steering to center itself (like when you let go of the steering wheel),
the
> car to track in a straight line (not wander) and to some extent steering
> feel. Look at it this way, invision the wheels on the front of a typical
> shopping cart. With this castor setting, the axis of the vertical link
> passes *before* the contact patch of the wheel, this wheel (when pushed
> from behind) wants to track or follow the vertical link. The further in
> front the more it will track in line (and the harder, effort wise, it is
to
> turn). If, on the other hand, you switch the axis to after the contact
> patch of the wheel, it becomes easier (effort wise) to steer, but will
> become much more twitchy and if moved far enough back will not track at
> all, but try to reverse itself. (is this sounding clear, or am I
muddying
> things up further??)
>
> Barry Schwartz in San Diego, CA
>
> Bschwartz@encad.com
> 72-V6/5sp Spitfire ( daily driver )
> 70 GT6+ ( when I don't drive the Spitfire )
> 70 (sorta) Spitfire ( project )
> 73 Ford Courier ( parts hauler )
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