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Old 05-22-2014, 11:34 PM   #1 (permalink)
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Stock Mongoose regulator - anyone know how to fix these things?

I've got the stock bottomline regulator from an NPS Mongoose electroblowback that I am trying to make work for my Sniper. I've been able to rethread the front of the regulator to take a standard NPT fitting, and nothing is leaking, but the regulator's adjustment does not seem to be functional. When I turn the pressure adjustment screw the pressure seems to go all the way on (to 800psi) or all the way off.

Anyone know why?

If the pressure adjustment screw is going to be worthless, is there a way I can re-shim the piston to output around 400psi?

Any help would be appreciated.
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Old 05-23-2014, 05:41 PM   #2 (permalink)
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Ok, I removed the spring washers and replaced them with a weaker spring, and with a little monkeying around I have the reg outputting 400psi, but the recharge rate is unusably bad, like, 2 seconds from shot to shot. Worse, if it sits for more than a minute it climbs above 500 psi.

I really had high hopes for this thing. The reg that came on my old Spyder Shutter worked great.
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Old 05-23-2014, 07:28 PM   #3 (permalink)
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Hmm, I have tinkered with these regs before, and have one set to below 400 psi. I got it down there by removing a couple of washers. I use it on my Spyder VS2. I just had it out for the first time a few weeks ago and it kept up nicely with some quick short strings. Have you tried replacing any orings in it? Its been a while since I completely tore one down. Any internal scoring?
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Old 05-23-2014, 07:45 PM   #4 (permalink)
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No scoring but there are two imperfections in the anodization on the edges of the interior forward section. I haven't been able to see any problems with the o-rings and I've given all the guts a thorough cleaning and applied fresh grease.

What would cause a reg to creep, anyway?
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Old 05-24-2014, 09:51 PM   #5 (permalink)
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It seems as though the recharge rate of the regulator is tied to its output velocity. If shimmed for 800psi (almost free-flowing) it recharges very quickly. At 400ps, it needs a couple seconds. 600psi is somewhere in the middle, almost usable for pump but not quite.

At least I only have a couple bucks sunk into it.
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Old 05-24-2014, 11:39 PM   #6 (permalink)
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Hmm. Weird. Like I said, mine, which is a Kingman reg, set to sub 400, recharges quick enough to not see shoot down on fast short strings. Looks like I need to do some more research. Lol.
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