- - P.M.I. I efficency
|splatmaster12 ||09-29-2012 08:40 PM |
P.M.I. I efficency
I recently bought a p.m.i. I from a member here, it came leaking so I replaced all of the seals. Now it is only getting around 10 good shots per 12gram, which from what I know is really low. I dont hear any leaks and it isnt shooting over velocity, I dont know what else it could be. Any help would be greatly appreciated.
|Long Beard ||09-29-2012 09:17 PM |
paint size is a big killer of efficiency in Sheridan's. Because you have a set barrel size and paint has become relatively small, you need to look for bigger paint to match as best you can. You could also do a performance tune on your valve (or have it done by Palmers or Walz) to increase efficiency a bit.
There is no way that it should be getting less than 25 shots if it is chrono'd at 280.
I'd suspect the valve to be kept open by a weak valve spring if there is absolutely no leaks. I wouldn't rule out a leak as they can be very small.
Most of the time I have a leak it's from not screwing the co2 cap in enough.
Once you get it working.... It's possibly the most fun gun I've ever had.
Sounds to me like you might need a new spring set (main & valve).
Also a palmer dyna valve pin will help you get more shots.
For me 100% stock pmi is getting about 16 or so good shots and with a palmers dyna valve pin about 20 or so and if you enlarge the transfer ports and modify the valve to a one hole type you will get over 30 good shots with sized paint.
Widgets can also help with fps issues...
Hope this helps a bit...
Hope this helps you out...
|snaparen ||09-29-2012 09:26 PM |
air it up and submerge it in the tub and look for bubbles, that will identify slow inaudible air leaks. But with only getting 10 shots that would be a fast leak.
|c6quad ||09-29-2012 09:58 PM |
submerging it will tell but i wouldn't recommend that simply because of rust. just air it up and leave it for a few hours or overnight and then check to see if it held air.
|splatmaster12 ||10-09-2012 05:15 PM |
My plan was to air it up and fire one shot per day until it was out, but after the 10th day I gave up. Im guessing over boring is my problem, but thats not fixable seeing as I already shoot the cheapest paint at $80 a case. Anybody got a smaller bore body they would trade straight?
|Murf425 ||10-09-2012 05:20 PM |
Not sure if there are smaller bore bodies...other than having a new barrel tube put on it.
|c6quad ||10-10-2012 12:56 AM |
yeah, you're not gonna find one with a tighter barrel. they're all big. paint was larger in size back in the day. you can send it to someone like WALZ and have them put a small bore barrel on it.
|chrislognshot ||10-10-2012 09:33 PM |
you will find paint size is killer on all old pmi 1 2 or pgp p68sc if your paying with rock and cock. since it hard to find paint to match the barrel. or any old pmi that use hopper too. i have short pmi 1 with hopper and on my 4oz tank i only get about 100 shots do to fact paint does not fit the barrel right.
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