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  #31 (permalink)  
Old 12-02-2011, 08:30 AM
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I like the idea of running the compressor with a generator.

Quote:
I could buy 1 of the HF 220v electric models and run it with the 5k watt generator
I have a 3500 watt gen and run a HF 3 hp compressor with it. It works great but you can't use an extension cord unless it is huge. I can get way with a couple low powered lights but that's about all the gen can handle. When both the compressor and the gen run the noise is horrendous. The compressor is bad enough but adding the general drone of the gen and you have to have earmuffs to be around them.

My 12kw gen runs the compressor much easier and actually doesn't make as much noise as I can use the big extension cord and let the gen sit in the truck or trailer.

Years ago we had a gas compressor out in the woods while we built a cabin and even there it was very noisy.

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  #32 (permalink)  
Old 12-02-2011, 08:48 AM
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Quote:
Originally Posted by bentwings
Years ago we had a gas compressor out in the woods while we built a cabin and even there it was very noisy.

Years ago we had customer who had to work near his air compressor and since his service truck had no hydraulic system to drive a hydraulic motor we used a 16 HP Kholer gas engine. This guy had to work in close proximity to this very loud compressor quite often and noise was a major concern so he brought it back to the shop and asked if there was some way to muffle it. We first replaced the intake filter with a long tube and a remote filter then ran a long pipe from the exhaust to the other side of the truck, the factory "muffler" (if those things can even be called a muffler!) was replaced with an automotive type about half way along the length of the pipe. We then made a deflector of sorts from light gauge metal that was positioned around the pump, being careful not to interfere with cooling air flow, that deflected the sound waves back onto the compressor itself. With these mods that thing went from deafening to the point of being able to talk in normal conversation levels only a few feet away.
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  #33 (permalink)  
Old 12-02-2011, 08:59 AM
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Quote:
Originally Posted by oldred
Just to hazard a guess here I would think maybe that specific pump for the small gas compressor may have a modified lube system allowing for the idle RPM?
I'd be interested in seeing the insides of that specific gas powered pump. Maybe something 'spring loaded' so it would lube good at idle, but wouldn't be in effect when the pump was running full speed, else there'd be a lot of oil slinging around I would think. Unless the idle RPM is enough to lube it w/the standard oil splasher.
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Old 12-02-2011, 09:31 AM
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e boseze

Ya might look around for a new or used comm. construction unit with a gas engine rather than elect. Just change the engine out !!
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Old 12-02-2011, 09:48 AM
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Quote:
Originally Posted by cobalt327
I'd be interested in seeing the insides of that specific gas powered pump. Maybe something 'spring loaded' so it would lube good at idle, but wouldn't be in effect when the pump was running full speed, else there'd be a lot of oil slinging around I would think. Unless the idle RPM is enough to lube it w/the standard oil splasher.

I was only guessing and the thing may not be any different than a pump for the electric compressor, I can't help but think it probably is modified or possibly they just keep the idle RPM up to the minimum pump RPM? From what limited experience I have with these little compressors I have found them to be a series of compromises in design but for their intended purpose and for what they cost that is to be expected and usually not much of a problem. Obviously one of these compressors would not last long in everyday use like the industrial units but then they were never intended for that purpose. Building one from parts is certainly do-able and can result in a usable compressor but getting it fine tuned to work efficiently can be an exercise in futility, most home built gas compressors I have seen usually were fairly wasteful and consumed a lot more fuel than a factory built properly tuned design that provided the same amount of air. Lots of guess work, trial/error and just simply having to use what's available makes it darn near impossible to even get close to the efficiency of a factory engineered unit but I bet that HF compressor would be little to no better than a well thought out home made outfit.
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  #36 (permalink)  
Old 12-02-2011, 01:00 PM
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I found a winner. Northern Tools Northstar 45929 pump. rated for gasoline powered compressors and gives a 5hp requirement for gas engines, or 3hp for electric. Also, they use the identical pump in 1 of there Northstar branded compressors, and the parts breakdown for that compressor is in the pump manual.. 1570 max rpm, 700 min. but with the 11" pump pulley and 4.5" engine pulley it'll spin 1472 RPM, 736 RPM at idle. So it's perfect. All pump parts are available too.

8.2 CFM@ 90 PSI and I may order the tank for the compressor as a replacement part out of the manual. It holds the mounting locations for the pump, and being it's GX powered, my clone will bolt up directly
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Old 12-02-2011, 04:02 PM
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You will be rewarded for doing your homework! Most homebuilt compressors either don't perform well or break something in short order or both because the builder does not bother with the details like you have but I predict yours is going to work out just fine, keep us posted.
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Old 12-02-2011, 04:19 PM
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One of my 1st compressors

was run buy a 4 Hp gasoline engine and the compressor was off a large freezer from the 1950's and all i had on it was 2 100lb blow off valves and let it run continuously when i was using it. it ran all my air tools plus paint when i added a water filter from sears. Costs here was nill i had the engine and the freezer compressor was rescued from our local dump. the tank was a water tank about 60 gallon galvanized one.
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Old 12-02-2011, 04:34 PM
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That setup may have worked somewhat but you are lucky you didn't get killed with that tank! Man I just can't believe people do stuff like this, have you got any idea at all just how much damage a ruptured 60 gallon tank can do? A WATER tank is NOT suitable to use for air or any other pressurized gas storage, never ever use a water tank for an air tank!
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Old 12-02-2011, 04:49 PM
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yep. oldred and I have discussed that some time ago, as I actually have a simmilar setup, which uses a 1950's refigernant pump powered with a 3/4hp electric motor and an old water tank. It used to pump 120 psi if you let it, but has since been decomissioned for the most part due to the safety issues. it was never very efficent. it still runs and I have used it to pump up a lawn mower tire from time to time, but I never let the tank build pressure any longer.
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  #41 (permalink)  
Old 12-02-2011, 05:23 PM
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Quote:
Originally Posted by oldred
You will be rewarded for doing your homework! Most homebuilt compressors either don't perform well or break something in short order or both because the builder does not bother with the details like you have but I predict yours is going to work out just fine, keep us posted.
I'll keep posted, and keep track of cost/ parts. I figure it will perform as well as the Northstar compressor and be about 1/2 the cost
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Old 12-02-2011, 05:42 PM
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11 years I used that home made compressor

And I am still alive it held 80 lbs of water pressure. I don't think PSI is any different for air is it is for water. In the 1950's everyone had a home made compressor, similar to mine. Only one instance I ever heard of was a fella one Morning needed to pump his tire to get to work. He mistakenly left for work and forgot to turn off the compressor. The pressure built up and blew the plug out of the tank it traveled across the road and embedded in a telephone pole. penetration was nearly all the way through the pole. He did not have a blow off valve on his unit. Any way I'm alive and can talk about the good ole days, That ole rig paid for itself hundreds of times for me.
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  #43 (permalink)  
Old 12-02-2011, 05:56 PM
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water cannot be compressed, and therfor, there is a lot more energy in compressed air than water that is under pressure.
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Old 12-02-2011, 06:05 PM
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Thats good info to know

No wonder my 60 gal tank held 100 lbs air pressure for 11 years it must have been a good strong tank..
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Old 12-02-2011, 06:15 PM
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or, you were just lucky it didn't burst.. If a water tank ruptures, it leaks and pressure drops right off. if an air tank ruptures, the tank can become a projectile because of the extended force, which is why the 2 tanks are diffrent for the most part
SOME tanks that are rated for water are also rated for air.

For this purpose, a propane tank is a much better candidate, as there rated for the pressures with a gas
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