John could you measure the wire diameter of those for me? as i wont be looking for anything quiet as strong as 325, so hopefully i can optimise the space as its looking very close from this mornings measurements

West

Sure.

The wire diameter on the 380 lbs/" spring is 9.94 mm (just over 3/8").

Well after a little rearangement and playing about on the Jig/upright, and even thinking up a totally radical idea then reverting back I think i may have cracked it

Got a potential spot for the coil over with 1.9 springs and acting direct on top of the hub giving in theory a very close spring rate=wheel rate

WEST

My results were'nt bad using ancient mechanical bathroom scales and an even more ancient pillar drill

West,

Have you got any pics of your design yet or is it still a "in the head design", if you do have pics I would like to see them to see if I can improve on my own efforts.

The design is a little of in head/scribbles in the scribble book, and drawn on CAD, as with alot of my frame so far, I even have done some fea on the bracketry to fine tune the designs a little. The top arm is custom and due to the lack of space in the engine bay I have had to come up with a cunning plan to get everything in its been a nightmare there are a couple of pictures in the members area that give a clue to how im doing the top arm.

back to the beer and a little light reading before I draw up the simplified suspension arcs to check the coilover postion/movement ideas

trying to keep options open on the coil over postion at the minute as got to consider that one day i will fit Drag slicks and they are a little wider than my road tires so need to keep some extra clearance in reserve


WEST

Hi West
Brought 3 sets of 1.9" springs from e bet and the sizes make no sense

They are all the same make

180 lbs 9" long 2.64 "dia 10 coils 0.36"dia

225 lbs 6" long 2.6" dia 8 coils 0.34"dia

250 lbs 6" long 2.6" dia 8 coils 0.35"dia

Im none the wiser

Normally

thin wire = soft
thick wire = stiff

more coils = soft
less coils = stiff

bigger overall diameter = soft
smaller overall diameter = stiff

Thats how your springs seem to be working too.

With you specs just quickly ran it through the softwaretrickery it came up within +/- 15Lbs

So not too bad for the software i guess as it probaly a little idealistic

Been playing around with my Spring angle/postion on the CAD and the angle is giving a an almost linear movement with the wheel, Without resorting to rockers/etc you struggle to get away totally from falling rate but I have managed to get a motion of 75mm of bump @ wheel the shock is 72mm worse case not bad, just need to try a couple of tweeks to check tire clearance etc.

WEST