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AirGunEric · Site Admin

As many of us are aware- heat (for example, placing your Co² powered gun in the sun on a hot day) can cause performance problems. The most obvious one I am familiar with is Co² over-pressurization due to heat, not allowing valves to open properly, or not at all, when the gun is heated up.

Then today I stumbled across another heat-caused issue: I left a couple of loaded 12-shot magazines for a Crosman 1077 laying on a table in the sun. The magazines are made of some sort of plastic- like most of the rest of the 1077. The magazines heated up to at least 100 degrees Fahrenheit (being black plastic didn't help)- and half the pellets fell out of them! Seems that lead doesn't expand as much as black plastic so the holes the pellets sit in grew, the pellets did not and they fell out. Not a big deal sitting on a table- but this can't be good if one were trying to shoot the rifle with pellets falling out (in the case of a rotary magazine, likely jamming the gun).

So I'm wondering what other heat-related issues occur with airguns that I've never thought of or seen?

airbuddy3 · Member

certain lubes are temperature sensitive , and in very warm weather can migrate and cause deiseling and in cold weather become very viscid and
change the FPS and the POI ..enough for it to be significant , I dont use temp sensitive lubes in springers , specially for those that compete with them as in National FT and other competitions .

Frank

AirGunEric · Site Admin

If you don't mind me asking- what sorts of lubes are stable enough to be able to maintain the same viscosity from -20ºC to +35ºC (-4ºF to +95ºF) and work in springers? Some sort of synthetic engine oil or grease?

airbuddy3 · Member

No The oils and greases , change dramatically in viscousity as the temperature changes , as does spring tar .

for that kind of stability , you will need the dry lubes such as Moly and graphite, depending on the type and application ..molly can work between
- 200 *c to +400*c .

logunmk1 · New Member

Must be damned hot where you are Eric... Not like the frozen North

Garry

AirGunEric · Site Admin

leadman · Veteran Member

another thing to cosider is as air is compressed it heats up. the air in a springer will flash up to a thousand+ degrees when the piston slams foward this temp is so short lived noone notices

AirGunEric · Site Admin

Well- that's the initiator for the 'diesel' effect if any combustibles are in the chamber- but does it affect the gun in any other way, like for example could this heat not dissipate in some guns very well and result in burnt parts? I've never heard of such a thing- but that doesn't mean a whole lot. Very Happy

leadman · Veteran Member

the heat is only there for a fraction of a second so i would doubt it but say if you were fireing 2 shots a second then it may heat up enough to loose accuracy