air jack pressure
Discussion
Working pressure on the James Lister ones I had is 35 bar (~500 psi) per their catalogue. I used a big nitrogen cylinder because I got my gas free and it kept the system dry - but any old air will do. Unfortunately compressors to charge to this sort of pressure are very expensive...
http://www.jlsmotorsport.com/uploads/4/7/0/7/47074...
http://www.jlsmotorsport.com/uploads/4/7/0/7/47074...
Yeah mine will go up pretty quickly with much less than a regular air line - it all depends on the diameter of the piston in your jack, and the number of jacks - do some simple hand calcs and you can work it out pretty easily. The only reason the expensive ones use higher pressure is to either have a very small jack or to make it go up very fast - you obviously don't need it to move very quickly unless you're in a top race series, and bigger jacks don't make that much difference in weight so you can get away with a lower spec. Low pressure also obviously makes it much easier to seal!
On mine the race team made their own jacks with - they look pretty professional and just use a few O-rings, some ally tube with threaded ends for the cap, and a return spring inside to pull them up on de-pressure. I'm sure with a decent lathe, some ally and a couple of hours you could make some to do the job.
On mine the race team made their own jacks with - they look pretty professional and just use a few O-rings, some ally tube with threaded ends for the cap, and a return spring inside to pull them up on de-pressure. I'm sure with a decent lathe, some ally and a couple of hours you could make some to do the job.
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