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Looking to Buy an Air compressor

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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Looking to Buy an Air compressor

Unread postAuthor: VH_man » Wed Jul 04, 2007 8:02 pm

well, i have a grand idea for a semi-auto, shell fed marble gun, but i kinda need a compressor first.

my question to yall is what is the smallest size air compressor you reccomend. im looking to spend no more than 120 bucks. right now im eying a .5 gallon air compressor, only 56 bucks.

thanks
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Unread postAuthor: hi » Wed Jul 04, 2007 8:09 pm

you would be very unsatified with a .5 gallon compressor. i have a 15 gallon one and it is jus right for my cannons.

if i had a .5 gallon compressor i would get about a shot a day with my big cannon.

i recommend nothing less that 8 gallons. you get what you pay for.
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Unread postAuthor: VH_man » Wed Jul 04, 2007 8:17 pm

what about 1.5 gallons?

im looking to use it for rapid-fire applications, not for filling up huuuugggeeee cannons.

and i forgot to mention in rapid-fire applications the chamber is SMALL
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Unread postAuthor: Gepard » Wed Jul 04, 2007 8:33 pm

If you've got a 120 bucks then go for the biggest you can.


Even if you get a small one, chances are you won't be able to use it for more than 15mins per 3/4hour as they have duty cycles so they don't overheat.

Michael
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Unread postAuthor: VH_man » Wed Jul 04, 2007 8:36 pm

oo heyyy does anyone know where i could just get the compresser part? i have a couple outdated propane tanks in my basement. those would make a mean air chamber. each one of those is like 2 gallons.
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Unread postAuthor: hi » Wed Jul 04, 2007 8:37 pm

the problem is that rapid fire cannons, even with small chambers, use tons of air.

with a big compressor it will charge itself, then turn off for a little while, then turn back on. a little one will keep running and running and never get a break.

even 2 gallon compressors are really only good for filling ballons, they will not be able to keep up with you, maybe a shot every 30 seconds or so, but thats not rapid.

if i were you i would check ebay, you can get a decent compressor there.

edit- again, check ebay for just the compressor part.

edit edit- i checked ebay, you can get an 8 gallon compressor, new, for about $110 with shipping. id go with that.
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Unread postAuthor: rednecktatertosser » Wed Jul 04, 2007 8:53 pm

My advice is to check the craigslist for your locality. I prefer it over ebay cause you can see what your buying in person before you decide.
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Unread postAuthor: From_Hamsterdam » Wed Jul 04, 2007 8:59 pm

what Psi can these cheaper compressors get up to?
is the out put regulated in any way? or do you have to buy a regulator?

my chamber is about 753cm cubed and i need to fire about 7 shots.
7x756=5271 cm cubed about 1.4 gallons for all shots

so if i get a 1.5 gal will the last shot be at a very low pressure?

this website has a handy unit converter:
http://www.engineeringtoolbox.com/volume-units-converter-d_1034.html
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Unread postAuthor: rednecktatertosser » Wed Jul 04, 2007 9:04 pm

I think most of the cheap ones go to around 100-115 PSI and a few go to 125PSI.
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Unread postAuthor: frankrede » Wed Jul 04, 2007 10:19 pm

From_Hamsterdam wrote:what Psi can these cheaper compressors get up to?
is the out put regulated in any way? or do you have to buy a regulator?

my chamber is about 753cm cubed and i need to fire about 7 shots.
7x756=5271 cm cubed about 1.4 gallons for all shots

so if i get a 1.5 gal will the last shot be at a very low pressure?

this website has a handy unit converter:
http://www.engineeringtoolbox.com/volume-units-converter-d_1034.html


Only the first shot will be a full pressure
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Unread postAuthor: From_Hamsterdam » Wed Jul 04, 2007 10:40 pm

Only the first shot will be a full pressure

so it would be cheaper to make a secondary chamber and pump it up using a normal pump?
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Unread postAuthor: rednecktatertosser » Wed Jul 04, 2007 10:42 pm

Cheaper, yes. More practical, No.
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Unread postAuthor: origin unknown » Thu Jul 05, 2007 1:52 am

This factory reconditioned compressor is $20 over your spending limit, but It is your best buy with a 5 hp electric motor, holds 17 gallons, and has a running pressure of 150psi. Here it is: http://www.amazon.com/Campbell-Hausfeld-Gallon-Compressor-Reconditioned/dp/B000FN9S9G/ref=sr_1_29/105-5243907-5406851?ie=UTF8&s=hi&qid=1183618054&sr=1-29
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Unread postAuthor: noname » Thu Jul 05, 2007 10:50 am

I managed to find a 5 gallon 3 hp compressor at Kragen Autoparts for only $90. The compressor pumps fast enough to let me shoot any of my strafers for over a minute (holding down the trigger) without th pressure dropping below 80 psi.
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