I have a 31.5" Posies Super Slide front spring with reversed eyes that's going under a '30 Model A with the 4 cylinder engine. Has anyone used this with the banger engine and if so, do you recall what the spring deflection was? I'm referring to the vertical height change from the top of the spring to the eyes when going from a relaxed state to weight on it, [as in on the ground] I spoke with someone at Posies and I'm not 100% sure they were understanding my question as they first started out talking about the angle of the hangers and the spring getting "longer" with weight applied. I said I get that, and again asked about deflection. At first he said 3/4" [which didn't sound right at all] then said 2" which sounded more like it but looking at the spring itself almost sounds like too much. My reason for asking is I need to replace the center of my crossmember due to some cracking and was thinking about raising it for some additional drop. [there's a little more explanation and some other unanswered question on page 4 here] https://www.jalopyjournal.com/forum...etc-build-thread.1341093/page-4#post-15751778 Thanks, robj
Changing the Pocket depth of the crossmember won't change the compression or set ride height of the spring.
Too many variables for a manufacturer to give you a hard number. Engines weights are all over the map. Then a thousand other things like fenders, radiators, bumpers, and even the body style will affect the amount the spring compresses. Lots of generalizations could be made, but it’s just not exact.
Look up the respective weights of the banger, fatty v8 and say sbc and be guided by that. If you add lowering when repairing the crossmember if you overdo it slightly it can easily be shimmed back up to required height. Chris
Have one on my 32 coupe. Has SBC no fenders. Had to add a one inch spacer to help it set better. Spring is over 20 yrs now. Still sets good
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