alternate thread title; slow day at work flipping through my copy of Chassis Engineering I see a basic formula for calculating spring rates for leaf springs leaf width times number of leaves devided by 12 times 1000 times leaf thickness devided by leaf length to the third power and wrote this short excel formula to have a calculator on hand just in case I want to do some quick syferin' anybody else got any nifty excel formula?

I made one that figures out optimum intake and exhaust runner length and graphs the results so you can tune your custom manifolds easier. Its based on Helmholtz Resonator equations. If anybody wants a copy, just shoot me a pm.

I made one for figuring out rear end ratio required for a drag car based on desired max engine rpm at the end of the quarter mile. (Didn't want to over-rev our flatty in the HA/GR car.)

I have one to compute compression ratio, if you want it P.M. me. If someone knows how to post an excel file, please post instructions and I will post the file.

Thanks, everyone. When I get home I'll try to download all this. It looks like really helpful stuff. Appreciate it!

I've got one for tire diameter, rpm, gear ratio, & speed...it's clunky, but I like it.. I'll try to attach later.. EDIT - Attached it - it's got tabs for the common early Ford rear ratios along with each of the various trans cluster ratios - you can input tire size at the top & it populates the rest of the sheet with rpm. First sheet has some various gear ratio/rpm/mph calculators

Here's a few that I've made over the years. I have others, but these are probably the most useful and easy to comprehend. Ratio - Shows relationship between road speed and rpm on a graph based on rear wheel size (accounting for tire crush), rear end gears and tranny gears. I made a table of trans gears for comparison purposes. Carbsize - This one was based on info from an Edelbrock catalog a few years ago. Might be useful in selecting carbs. Suicide tube strength - a quick and dirty one showing deflection for different diameters and wall thicknesses of round tubing.

'nuther super basic one this could be adapter for any motor, just change the stock bore and stroke columns to match your motor's stoke numbers to use this just put your desired over bore and over stroke numbers in the blue column and check out the new cubes in the red column

Alright guys....most of the hard work has been done for you already.... http://www.wallaceracing.com/Calculators.htm

Does this assume the center bolt (and point of spring rate measurement) is equidistant from each end? Of course, most MoPars have shorter spring segments ahead of the rear axle than behind the rear axle...