Thread: Can it be done?

Originally Posted by roverrescue

If you want Some understanding of airsprings have a read of this:

http://www.airsprings.com.au/PDF/pro...e-airmount.pdf

It is for firestone bags but importantly gives the specification graphs for
Different bag designs...

Rolling sleeve bags ala rear of D2 and D3,D4
All display a neutral pressure response to height change whilst within their operating range. It is pressure that sets spring rate.... so this is a near perfect match to coil springs that within operating range display the same spring rate. This likely gives the most predictable handling in cornering or other suspension travel events whilst driving.

Double convoluted bags display a rising rate of pressure as height decreases which also increases spring rate.

For the front of a D2 with a known front axle rate I would choose a rolling sleeve bag and run an external damper.... or alternatively run an air strut and mod the chassis to eat it

Steve

nice link
the air bag on page 84 was the one i found most interesting
pressure increase's the bags spring rate in relation to load placed on top of it to maintain height with slight increase in volume which id assume is from the bag being larger due to extra pressure)
the one on page 84 had a tapered piston ( tapered from larger at max extension to smaller at min extension) and as the piston became smaller the bag actually lost spring rate with its compression until it only had 3/4in of travel left then increased again

unfortunately it had nothing on how much of a increase/decrease on piston size effects spring of the bag as well (changing how tight the roll lip is)