I believe that the transverse leaf spring on my model T is both too weak and too short resulting in virtually no suspension travel. I would like to have a custom spring manufactured and would be grateful for advice on how to specify the spring. The car is running a Ford Beam axle (38.5 inches between perch centres and 48 inches between king ping centres, that seems to equate to a 37-41 Ford ?) The spring is mounted directly above the axle via perches and shackles, suicide style, with the spring mount protruding from the front of the chassis. The current spring is "reverse eye" to get the ride height low, however the spring is almost flat when under load. The axle is supported with split wishbones.
I have had the quarters weights properly measures and I have weighed the front axle/hubs/wheels etc to estimate unsprung weight. What I am struggling with is how to specify the spring shape, size and spring rate. Or should I simply provide information to a spring manufacturer and let them work it out - although I am nervous about getting the ride height right.
I have attached pictures showing the suspension loaded and unloaded
Can anyone help please? Many thanks, Brian.