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PostPosted: Sun Apr 17, 2016 11:15 am 
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Pokerdogg wrote:
Holy cow, if you are pumping 40 times for one shot, YOU are the beast.


I think it was by way of scientific investigation rather than a suggestion for a practical setup. I run mine between 800 and 1100 psi at three pumps per shot which seems pleasingly efficient compared to the first part of the curves above. On the other hand, I don't think I ever managed to get mine up to 2500 psi - I think that takes a pretty well tuned setup with minimal dead space.


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PostPosted: Sun Apr 17, 2016 2:44 pm 
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Location: Coalmont BC
Quote:
I run mine between 800 and 1100 psi at three pumps per shot

I guess you must have stuffed the valve to reduce the internal volume to about half that of stock.... That can work well if you don't want too much power, but limits the FPE to a significant degree.... What velocity are you getting with what pellet weight at those 3 pumps?....

Bob

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Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since!
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Too many! Springers, Pumpers, CO2, but I love my PCPs and developing them!
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PostPosted: Sun Apr 17, 2016 2:53 pm 
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Hi Bob,

Actually the opposite, I put an external tank on it good for 50 to 60 shots, so the three pumps per shot is an average over the working range. I dislike pumping it from empty so I typically pump between magazines, using the marauder 10 shot mags, and adding 30 pumps to top it back up. It shoots in the 480 fps region with .177 pellets. It was largely inspired by your millennium pumper, but scaled down to meet my more modest abilities. I'm still delighted by the way it turned out, fitted with peep sights it's a pleasure to shoot. It's still not finished, needing a decent pump handle and a stock, but I got sidetracked by other projects.

All the best,
Jim


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PostPosted: Sun Apr 17, 2016 3:26 pm 
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Location: Jefferson, Oregon
I have a question, I believe it's common practice to cut two threads off of the male thread part of the valve. I've never had one come apart but have always wondered what pressure level -2 threads is good for. Makes me wonder when I do 25-30 pumps. Regards, Tom

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PostPosted: Sun Apr 17, 2016 5:17 pm 
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Oh dear, on reflection my earlier post was complete rubbish. The pumps per shot to top up has nothing to do with the pressure that would be achieved with three pumps from empty. I've been away from this for too long. Sorry for any confusion caused.


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PostPosted: Sun Apr 17, 2016 11:22 pm 
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Yeah, you can't get there from here.... *LOL*.... ACP's (aka Retained Air Pumpers) are another breed altogether.... Glad you are happy with it, tho....

Bob

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Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since!
Airsonal;
Too many! Springers, Pumpers, CO2, but I love my PCPs and developing them!
Proud Member of the 2000+fps Club!


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PostPosted: Sun Apr 24, 2016 3:15 pm 
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Location: Calgary, AB
Excellent information. Thank you :D

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