[urq] Pressure accumulator , The Bomb , thoughts

Patrick Carlier p.carlier at pandora.be
Mon Dec 8 09:59:17 PST 2008


So now I've reached the stage where I'm to put the hydraulics back together . 
I's all pretty straight forward , altough I had a hard time finding the pump . :)
To may parts , not enough storage room .  

I think it's safe to assume that a 1981 bomb is dead by now . 
It hasn't been used for at least five years and I have no idea 
about it's condition or about it's previous condition when I stored the car . . 

Dealer wants 200€ for a new one . No way I'm gonna pay that kind of money . 

So I did some research and then machined a small part that allows me to use 
a commonly available  brand of bomb . This one is 80€ only , and it 's recheargable . 
If the nitrogen pressure is checked and serviced , say every two or 3 years it's 
supposed to last a lifetime . We'll see . 

Now the only snag left is the precharge pressure . 
I just can't seem to find that information . 
The audi hydraulic system operates between 36 and 57 Bar .
Got that from the audi workshop manual .  
The bomb constructor recomends a precharge pressure of 0.8 ..0.9 times P1 . 
That would be 28.80...32.40 Bar . 
30Bar would be a good value then . 

Does this makes sense ? 
Thougts , btdt's .. fire away . 

Pat 
1981 WR back on its wheels . 


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