Just spent an education half-hour at Faulkner Springs down by
Chichester - nice day for a drive!

The existing springs can't take the weight of the car at present; I
needed a couple of inches at the front and an inch-ana-half at the
back. Increased stiffness is also desired to stop it moving so much
under braking.

Faulkners tell me (and I vaguely remember this from O-level physics)
that for a given spring rate, the ride height is set by the weight and
the length of the spring. So if it's too low, a longer spring of the
same rate will lift the ride without affecting the deflection under
suspension loads (though it may become coil-bound if the wire is too
fat). If the spring is made stiffer and of the same length, it will
also lift the ride height - this is what I need.

As measured, the front spring was compressing six inches with 720lbs
on it; the rear four inches with 360lbs - which makes sense; total
weight of the car is 1000kg = 2200lb; 720+360=1080 per side - near
enough for back of the envelope arithmetic) . That gives spring rates
of 120lbs/in and 90lbs/in; keeping the same lengths but stiffening by
50% (for 180 and 135 lbs/inch) gives both the ride height increase and
the stiffness change I want.

Magic!

Just waiting for the quote now; should be about fifty quid a corner.

Neil

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