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Old 04-30-2012, 09:01 AM   #1 (permalink)
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Rocket powered RT

Why does my RT sometimes blow air out of the back like it's an F-16 engine? I will either run an 900 or 1000 psi reg and it's usually cronied to the 270fps range. What's up with this thing?
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Old 04-30-2012, 09:33 AM   #2 (permalink)
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Just because it's an RT with a banjo bolt, probably.

Make sure you use AGD urethane o-rings on the banjo bolt, or some 90 duro urethane o-rings. Softer ones will let the valve shift back, which can let the middle o-ring leak. Mark your banjo bolt with a scribe or nail polish so that you know it is not backing out.

I find the slower leaks are usually just the top o-ring not seating in the valve, and I can turn the bolt a hair either way to stop it. The big leaks were always the middle o-ring.
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Old 04-30-2012, 10:00 AM   #3 (permalink)
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is it blowing out the back where you adjust the velocity? or is it from the relief hole in the reg?

if it's blowing out the back, check your reg-piston o-ring. My RT would intermittently leak from the back until I replaced this.
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Old 04-30-2012, 02:45 PM   #4 (permalink)
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ReTro valve in a classic. No banjo. I have recently replaced the orings with an RT kit. Bad o-ring? Should I stay away from some companies RT products? Thanks.
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Old 04-30-2012, 02:58 PM   #5 (permalink)
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Quote:
Originally Posted by wooulfy View Post
ReTro valve in a classic. No banjo. I have recently replaced the orings with an RT kit. Bad o-ring? Should I stay away from some companies RT products? Thanks.
Needs urethane, and fresher is better. There are some kits that have sat on the shelves for several years that aren't worth the trouble. AGD and Tunamart are still the best bets. I wouldn't use buna (black) o-rings in there.

Got plenty of oil?

If the reg pin o-rings leak-by, it can blow through the reg piston one way or the other, but you would see some hot shots also.
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Old 04-30-2012, 04:25 PM   #6 (permalink)
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Maybe a cheater mode installed by a previous user to run faster?
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Old 05-09-2012, 12:05 AM   #7 (permalink)
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Mine was doing this once, it would also shoot VERY hot occasionally (I dropped my cousin with a 370 fps shot.. oops). I had to pull the reg apart on my X-valve, re-grease the springs inside it (26 and 27), and replace the reg nut o-ring (24).

Automags.Org Online Forums - X-Valve Exploded (Here)
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