Rainmaker cycling questions

Bisbonian · 06-04-2008, 07:24 PM

I've got a well-modified Rainmaker; Marty mods, Thunderboard LCD, external regs, etc. My issue comes up if I turn up the rate of fire, the gun will fire the first shot then all that happens is the bolt will cycle but no big pop from the barrel. I don't usually play with it on full auto but it's nice to know what's going on with it. Anything up over 8bps and I get this, sometimes it will fire with every hit but mostly not.

I've tried a variety of dwell settings from low 40's up to low 50's and it doesn't seem to make a difference. I haven't checked the timing yet but I got the measurement from a thread on here so I'll give it a check.

Any ideas?

forstgump · 06-04-2008, 07:26 PM

I've had that cycle problem before and it was the "Timing" length.

Bisbonian · 06-05-2008, 10:55 AM

Quote:

Originally Posted by forstgump

I've had that cycle problem before and it was the "Timing" length.

I'll go ahead and check that. I was wondering about it but couldn't find the correct adjustment until I got on here yesterday. That would be an easy fix!

paintball sycho · 06-05-2008, 12:00 PM

could also be the hammer spring needs replacing, had a weak one in one of my old rm's and it did that also.

HurtCow · 06-05-2008, 12:43 PM

Try turning up the lpr pressure.

Bisbonian · 06-05-2008, 12:57 PM

Quote:

Originally Posted by HurtCow

Try turning up the lpr pressure.

I gave that a thought but just haven't done it yet. I've got a Rock LPR on there, should I just turn it up until it leaks out the MAC then back it off a bit?

Mad Marty · 07-15-2008, 01:51 PM

the first question I would ask is...Have you ever gotten it to cycle this fast with your current setup?

I would second what HurtCow said. A weak hammer spring could cause it, but would not be my first choice.

This is what I use to recommend guys do first.

1. Remove the trigger frame, but leave everything connected.
2. Lay the gun on a bench and gas it up, turn it on.
3. Fire the gun and watch the ram cycle. you should be able to see the carrier and hammer latch.
4. Cycle the gun fast or the way that makes it mis-fire (short-stroke), watch the carrier latch the hammer.

The Rain Maker can short-stroke at both ends of the fire cycle. It can miss latching the hammer on the back stroke and it can miss hitting the sear on the forward stroke. Low LPR press will cause the ram to move slower, which could cause both misses. Low main reg pressure or a slow recharge rate can also cause the short-stroke on the backword movement. Also, a weak valve spring will do that too.

If it is missing on the forward stroke, then it is a matter of speed and timing. The LPR is the first adjustment to make; then try timing, something higher than 50. I believe that setting is for both directions. So the would be 25 ms to move forward and 25ms between shots; but I could be wrong on that. If I remember right, I had mine set to 65. Also if the ram timing is on the long side, that could cause it to miss the sear when shooting fast.

06-04-2008, 07:24 PM	#1 (permalink)
Bisbonian Newbie Join Date: Jun 2008 Posts: 6	Rainmaker cycling questions I've got a well-modified Rainmaker; Marty mods, Thunderboard LCD, external regs, etc. My issue comes up if I turn up the rate of fire, the gun will fire the first shot then all that happens is the bolt will cycle but no big pop from the barrel. I don't usually play with it on full auto but it's nice to know what's going on with it. Anything up over 8bps and I get this, sometimes it will fire with every hit but mostly not. I've tried a variety of dwell settings from low 40's up to low 50's and it doesn't seem to make a difference. I haven't checked the timing yet but I got the measurement from a thread on here so I'll give it a check. Any ideas?

06-04-2008, 07:26 PM	#2 (permalink)
forstgump fap fap fap fap fap Join Date: Jan 2008 Location: Close to Gotham! Posts: 701	I've had that cycle problem before and it was the "Timing" length. __________________ *" Badges? We don't need no stink'n badges! "* Blazing Saddles! *Feedback Link*

07-15-2008, 01:51 PM	#7 (permalink)
Mad Marty Newbie Join Date: Jul 2008 Location: San Diego, CA Posts: 15	the first question I would ask is...Have you ever gotten it to cycle this fast with your current setup? I would second what HurtCow said. A weak hammer spring could cause it, but would not be my first choice. This is what I use to recommend guys do first. 1. Remove the trigger frame, but leave everything connected. 2. Lay the gun on a bench and gas it up, turn it on. 3. Fire the gun and watch the ram cycle. you should be able to see the carrier and hammer latch. 4. Cycle the gun fast or the way that makes it mis-fire (short-stroke), watch the carrier latch the hammer. The Rain Maker can short-stroke at both ends of the fire cycle. It can miss latching the hammer on the back stroke and it can miss hitting the sear on the forward stroke. Low LPR press will cause the ram to move slower, which could cause both misses. Low main reg pressure or a slow recharge rate can also cause the short-stroke on the backword movement. Also, a weak valve spring will do that too. If it is missing on the forward stroke, then it is a matter of speed and timing. The LPR is the first adjustment to make; then try timing, something higher than 50. I believe that setting is for both directions. So the would be 25 ms to move forward and 25ms between shots; but I could be wrong on that. If I remember right, I had mine set to 65. Also if the ram timing is on the long side, that could cause it to miss the sear when shooting fast. __________________ Mad Marty

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06-05-2008, 12:00 PM	#4 (permalink)
paintball sycho Rec Poster Join Date: Mar 2008 Posts: 38	could also be the hammer spring needs replacing, had a weak one in one of my old rm's and it did that also.