15-05-2019, 05:02 PM
Hi Denis,
To be as helpfull as possible more info is required.
Fast road/race suggests a two seater? Big Seven spring suggests you have a wider Big Seven front axle?
It is possible to work out spring rates for leaf springs by measuring the lbs force deflection per inch by making up a jig. Adjusting the rate by adding and subtracting leaves. Static height and therefore ride height being determined by the initial set which may need altering depending on final rate selection.
For example are you keeping your rear springs located inside the chassis or moving then on top of the chassis. This design choice will effect the static camber you start out with if using the original Austin axle spring locating lugs.
You give no idea as to weight and % f & r with driver. Or the f & r track depending on final wheel offset. Remember spring rate is one thing but wheel rate another and that is determined by the track to spring eye/sliding block if not using shackles, ratio/leverage.
Also please remember that the castor angle may be fine once the final chassis height, not forgetting the driver, front to rear is established.
If you can give us a bit more info I'm sure lots of good advice will be forthcoming.
Regards,
Paul N-M
To be as helpfull as possible more info is required.
Fast road/race suggests a two seater? Big Seven spring suggests you have a wider Big Seven front axle?
It is possible to work out spring rates for leaf springs by measuring the lbs force deflection per inch by making up a jig. Adjusting the rate by adding and subtracting leaves. Static height and therefore ride height being determined by the initial set which may need altering depending on final rate selection.
For example are you keeping your rear springs located inside the chassis or moving then on top of the chassis. This design choice will effect the static camber you start out with if using the original Austin axle spring locating lugs.
You give no idea as to weight and % f & r with driver. Or the f & r track depending on final wheel offset. Remember spring rate is one thing but wheel rate another and that is determined by the track to spring eye/sliding block if not using shackles, ratio/leverage.
Also please remember that the castor angle may be fine once the final chassis height, not forgetting the driver, front to rear is established.
If you can give us a bit more info I'm sure lots of good advice will be forthcoming.
Regards,
Paul N-M