GTA
Airguns by Make and Model => Benjamin Airguns => Topic started by: greenairrow888 on August 10, 2010, 06:42:17 PM
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People are always talking about pumping the Benjamin hand pump for 5 minutes and then let cool for about 10 minutes. Would it help to pump for 5 minutes then remove normally by releasing valve, removing hose from rifle, tightening valve back up and then pumping the pump without the hose connected to the rifle? With this drawing air in and pumping it back out, do you guys think it (the hand pump) would cool down faster and more completely therefore increasing pump life? Would this increase the moisture inside the pump? If this is done do you guys think that cooling time in between pumping up the rifle can be reduced from 15 minutes down to say 5 minutes therefore speeding up time shooting the rifle? Any opinions appreciated. Thanks.
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Sorry, I know nothing about the Benji PCPs. I'm stuck on old school pumper guns.
The subject line got my attention as I read it wrong. I thought it was about a Benjamin pump rifle that was too cool to put down. :'(
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What about adding a couple of copper heat sinks with fins on it (like the ones on a computer CPU cooler) secured with thermal adhesive near the compression chamber might help wick some heat away as you're pumping. The fins adding greater surface area for cool air to circulate similar to the way a car radiator works. I build pcs in my spare time and with the newer parts (that run really hot) most of the time these coolers do the trick. Just a thought I don't know if it would really make that much of a difference. I'm eying that Mrod/pump package PA sells but the reviews on the pump not so good! Seems heat is causing o-ring failure. I agree that cycling cool, uncompressed air through the the pump to cool the compression tube is sound in theory. If I ever get the kit from PA i will let you know if either of the two ideas is A:effective and B:Practical hopefully an engineer with a background in thermo dynamics will read this post and give us his 2 cents
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How about the quick and dirty solution of a five gallon bucket full of water, either with or without ice?
During the cooling off period, you could keep the hose attached, but dip the lower part (am I right that the heat builds up there?) in the water for a minute, then lift out and pump right away.
Naturally, you would have a towel handy to dry off the pump once you were done, but that's it.
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I think pink is right, water could be the way to go; but you would either have to have some kind of durable bag to put the pump into or a sealed pressure gage. you could also design a pump that has the gage and discharge tube mounted higher and be designed to be water resistant from the get-go, you'd also have to have a supply of water with you, which you could kept cool by adding some ice now and again. I think you could get by with maybe two gallons of water. The cooling fins might work, but they also would have to be designed into the unit from the start and may not bleed off enough heat to allow continuous pumping.
pv