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| Quick Qu https://www.ausmini.com/forums/viewtopic.php?f=2&t=35810 |
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| Author: | mooman10_0 [ Mon Sep 17, 2007 8:26 am ] |
| Post subject: | Quick Qu |
How does having air in your hydro suspension affect it? Thanks |
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| Author: | rehab1964 [ Mon Sep 17, 2007 8:28 am ] |
| Post subject: | |
the manuals say that the system needs to be evacuated before refilling so I'd be thinking it would - something to do with the compression rates of fuild verus air? |
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| Author: | Sprite_Man [ Mon Sep 17, 2007 8:34 am ] |
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Air compresses at a different rate to the fluid. It does need to be evactuated just like the manual says if you ask me. I am going through this process now. Make sure all your seals/rubber are good before you re-presurise - people tell me that they can blow - but I am not sure myself 
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| Author: | Mick [ Mon Sep 17, 2007 8:50 am ] |
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Sprite_Man wrote: Air compresses at a different rate to the fluid.
It's more that the air compresses, where fluid absolutely will not compress. The hydro will be all spongy and will bottom out. I did pressurise the system to get the car to a hydro pump. It only kinda helped a very little. I think it's the Doc that says that if you can't evacuate the system, pressurise it first, and then let it blow out three or so times. It will purge the air out of the system as the air gathers in the high points of the system. |
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| Author: | drmini in aust [ Mon Sep 17, 2007 9:01 am ] |
| Post subject: | |
In the good old BMC days many service places couldn't be bothered evacuating them for routine pumpups. it's really only necessary if pipes or bags have been changed and air has got in. Even then, they often used to just pump them high, then let fluid out FAST by depressing the valve. The pressure in the front bag will displace most air out the rear. Then pump up again. Morris 1100 setup was better, they put the drain/fill valves on the front hoses, near the top of the plumbing. Easier to get air out (it's always in the top of the system). |
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