 |  | | | |  | |  |  | Shooting pellets with oil? |  | |  |  | |
 Posted: Mon Sep 07, 2009 6:34 pm |
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| J5311 |
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I stumbled on this video of some guy using a springer and before closing the barrel he put 5-w40 in the skirt of the pellet and seemed to be more powerful. Is the because the oil doesn't compress rater then like air does?
http://www.youtube.com/watch?v=ecD3PV7-6X8&feature=channel_page
and how bad is this for your gun? |
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| Posted: Mon Sep 07, 2009 6:53 pm |
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| fritz |
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It's dieseling, that's not good. Before I knew about it, I had a MAJOR diesel in my 34. That little gamo match must have went downrange at 2,000fps. There was a cloud of smoke and a massive bang with the ever-audible sonic crack.
Don't mix oil and airguns. |
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| Posted: Mon Sep 07, 2009 7:28 pm |
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| Slavia |
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| The oil is burning (dieseling) as fritz said. More power at the expense of pressure stress on the spring. Heat damage to the seals. Degrading of the breech seal from the presence of a petroleum based oil. Crud in the barrel (notice the black residue around the holes?). More noise. Other than that it's a great idea, but I'll pass until they come up with disposable airguns. |
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| Posted: Mon Sep 07, 2009 7:52 pm |
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| J5311 |
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| aaaaAAAAHHHHH!!! I got it! wow. i cant believe i missed that explaination. Its called dieseling cuz because of the high compression that actually explodes like it does in the combustion chamber in the cylinder. I didn't know that was possible with air rifles. here is a question, what pneumatic guns like the beeman p17? |
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| Posted: Mon Sep 07, 2009 8:04 pm |
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| Slavia |
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| Quote: |
| Its called dieseling cuz because of the high compression that actually explodes like it does in the combustion chamber in the cylinder |
With a springer you're taking all the heat energy in a large volume of air, and cramming it into a small space so quickly the energy can't leave - so the temperature has to go up. With the P17 you compress the air relatively more slowly, and pulling the trigger dumps the pressure.
Here's an experiment for rsterne - figure out how to cock a P17 so quickly (milliseconds) that it diesels in your hand. Well, maybe not. |
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| Posted: Thu Sep 10, 2009 3:26 pm |
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| donwalk |
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in the DVD provided by Airforce, tom gaylord recommends lightly oiling pellets for use in the AF rifles. he even describes how to oil them.
in a springer the air is rapidly compressed by the piston that's how a diesel operates...heat of rapid compression.
PCP/HPA/CO2 is already compressed as a propellant and is released to propel the projectile with little or no heat generated.
a springer compresses the air, then forces it thru a tiny orifice causing proliferation of heat genertated combustion...dieseling |
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| Posted: Thu Sep 10, 2009 3:40 pm |
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| Rogerflat |
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| Isn't the point of lubing pellets to help to maintain your barrel by essentially cleaning it with every shot? I don't see how lubing pellets could help with accuracy or velocity. |
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| Posted: Thu Sep 10, 2009 9:43 pm |
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| firemandivi |
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| I'm not sure but I think the lube is helping the pellet form a better seal against the barrel. Allowing less gas to pass around the pellet and also giving the pellet less friction as it travels down the barrel, but I may be wrong. |
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| Posted: Thu Sep 10, 2009 11:17 pm |
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| broommaster2000 |
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What a friggin' idiot. (the guy from the movie I mean) Bet he can't hit that book at 15 yards.
| Quote: |
| Isn't the point of lubing pellets to help to maintain your barrel by essentially cleaning it with every shot? I don't see how lubing pellets could help with accuracy or velocity. |
I think Olympic shooters lube their pellets. So it does help with something. :p |
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| | | | | | | | | Re: Shooting pellets with oil? | | | | | |
| Posted: Fri Sep 11, 2009 12:20 pm |
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| Mark5043 |
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| J5311 wrote: |
I stumbled on this video of some guy using a springer and before closing the barrel he put 5-w40 in the skirt of the pellet and seemed to be more powerful. Is the because the oil doesn't compress rater then like air does?
http://www.youtube.com/watch?v=ecD3PV7-6X8&feature=channel_page
and how bad is this for your gun? |
It is a bad idea all the way around.Sure the dieseling this produces will increase your velocity,but your accuracy will be sh^t.I would much rather have a few hundred fps. less,and be able to hit a dime at 30 yards,than have a five inch group at the same distance.Once you hear that crack caused by the pellet breaking the speed of sound,your pellet will become unstable in flight,producing horrible groups. Keep your shots sub-sonic,and you'll shoot like a champ!  |
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| | | | | | | | | Re: Shooting pellets with oil? | | | | | |
| Posted: Fri Sep 11, 2009 12:25 pm |
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| Mark5043 |
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| Joined: 12 Apr 2009 |
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| J5311 wrote: |
I stumbled on this video of some guy using a springer and before closing the barrel he put 5-w40 in the skirt of the pellet and seemed to be more powerful. Is the because the oil doesn't compress rater then like air does?
http://www.youtube.com/watch?v=ecD3PV7-6X8&feature=channel_page
and how bad is this for your gun? |
It is a bad idea all the way around.Sure the dieseling this produces will increase your velocity,but your accuracy will be sh^t.I would much rather have a few hundred fps. less,and be able to hit a dime at 30 yards,than have a five inch group at the same distance.Once you hear that crack caused by the pellet breaking the speed of sound,your pellet will become unstable in flight,producing horrible groups. Keep your shots sub-sonic,and you'll shoot like a champ!Also if you plan on using any petroleum based products to cause this dieseling,get yourself a whole bag of extra piston seals,because you will be replacing them on a regular basis. |
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| Posted: Fri Sep 11, 2009 12:31 pm |
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| Mark5043 |
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| Ooops,sorry for the double post. |
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