Thread: Eas pistons

I don't recall the pistons being hollow, although it's been a while. Is this to occupy air space inside the spring body, or some other reason?

It must be.

The pistons on a P38A are hollow so I assume the RRC ones are, too.

Yeah they are ron, and am guessing what pete said in regards to occupying air space is what they meant

I suspect that by reducing the air volume, the "elasticity" (can't think of the correct term) will be reduced as the air compresses.

I would have thought reducing the air-volume was a backward step re: comfort. Somewhat akin to going from longer leaf-springs to shorter/thicker ones. Would still carry the same weight, just do it differantly...

But would reduce the response-time for height-changes.

In my fading memory, the older '89 I used to drive was a softer & more flexible ride on steel curly things, than my '95 EAS on Arnotts units.
I had fantasized about having air bottles, around 500cc each, plumbed into each 'bag via an on-off air valve. The theory was to be able to have them in/out of circuit to give boulevard-float / normal firmness settings.

The Lady Sarah, '95 Vogue SE auto. (RWD at the moment...) with working air suspension.

Edit:- "elasticity" works... regardless of correctness, it paints an accurate picture.

I may have to ring airbagman again and ask their reasoning! But hey, they are the experts

An air spring is a rising rate spring.
filling the piston will make the rate rise faster, I:E the spring will be harder when compressed, because there is less space for the air to compress into so the pressure will be higher.

Not sure why they recommend it with the longer bellows.

Do you use the longer bellows to get a higher ride height or more drop?

I would have thought you would do it because the car was being driven in a way that it was bottoming out.

Tony