Re: bomb recharge procedure???

[Phil and Judy Rose <pjrose@servtech.com>]

>This is starting to move out of the realm of what-if speculation, and
>toward possibility. Turns out I'll be changing my bomb in the next few
>days, so I'll have a bad one to examine and experiment on. Keep the
>comments coming - we can do this - after all, we're AUDI drivers, and have
>to fix all sorts of strange devices!!!!!
>
>Best Regards,
>
>Mike Arman


OK, here's some gratuitous advice: to plumb an experimental, modified bomb
with a T-fitting that has a 2000 psi gauge attached (i.e., bomb--> Tgauge
--> valve). Use this setup to verify that the pieces can hold pressure for
_at least_ a few weeks before trying to use a repressurized bomb.
Considering there is a 7 yr shelf life, I wonder if it's possible to put a
spec on the "expected" rate of pressure loss? I guess what one really need
to know is: at what psi is a bomb noticably bad, or "dead"? Then we could
speculate on "acceptable" psi loss/week.

Anyway, when folks talk of the bomb being at 2000 psi I guess that means
its _initial_ pressure; and that new bombs are shipped dry (empty of
hydraulic fluid) at first? If so, the "membrane" needs to be pretty rigid
to be able to retain that initial nitrogen charge against merely
atmospheric pressure (?). I hadn't thought about that before this thread.

Back (further) to basics: Doesn't this system require that the hydraulic
pump  be capable of generating substantially more than the bomb's (initial)
2000 psi pressure in order for bomb-assist to work?  I assume that the pump
must work against (i.e. move) the membrane to make the gas even more
compressed in order for brake-assist to take place?

Probably showing how shamefully ignorant of how our assisted hydraulic
brake system actually works. Or even how vacuum assist works.

There I've said it. Help me...

Phil Rose
'91 200q
'89 100
(both with marginal bomb-assist)

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