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Tool Talk Discussion Forum

old engine to make air compressor

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soupy

04-27-2005 18:04:05




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i saw some post one time where they discussed using a cylinder to make air compresser. i think they had a device to screw in place of spark plug..

no you have no idea what i am thinking about ,,i want to crank engine(to make air) with the 50lbs of unlimted water pressure i have from on the hill farm pond.




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cdmn

04-29-2005 19:21:10




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 Re: old engine to make air compressor in reply to soupy, 04-27-2005 18:04:05  
Take a look at Subaru engine. You can remove one whole side and replace it with something you make up. As for a water powered air pump, maybe you should look at a duplex steam powered feedwater pump. Instead of using steam, use water, and instead of pumping out water, pump out air. Valving might be pretty inefficient. I don't think it will work running backwards because the water output cylinder is a lot smaller than the steam cylinder. If you want 100 psi out with 50 psi in (actually you probably will have only 25 psi by the time you get to the piston) you need a bore ratio of 2 to 1, or higher. The GM diesel supercharger would work as a water motor, but there probably would be rust and lubrication problems. The company I used to work for, made pumps of the same design for fire trucks. So there you go.

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Bob

04-28-2005 09:10:33




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 Re: old engine to make air compressor in reply to soupy, 04-27-2005 18:04:05  
A gas engine makes a POOR air compressor, unless the head is changed to one designed for compressor use.

Commercial units that conver 1/2 of an engine to compress air use a custom-made cylinder head.

The space in the head, above the piston is necessary for gas engine use, to keep the compression ratio to a safe level. This works against you, though, for an air compressor, as the air being squeezed into that area, and then released when the piston goes down limits air flow, wastes power, and causes heating.

Of course, a diesel engine would have a head compression ratio design more like that of an air compressor's.

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Bill WI

04-28-2005 06:37:19




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 Re: old engine to make air compressor in reply to soupy, 04-27-2005 18:04:05  
The engine principle without water, I've seen a Wisconsin V4 used with one bank as a compressor and the other half running it. This was on a commercial rig, don't remember the name. I saw it on an auction.



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Bob - MI

04-28-2005 05:22:22




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 Re: old engine to make air compressor in reply to soupy, 04-27-2005 18:04:05  
Water spawned a great invention years ago when two brothers named Roots had designed a pumping system based on two interconnecting scrolls. They were working on it with the cover open and when it turned noticed a large volume of air that it could move. The supercharger was born.

Keep tinkering



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NEsota

04-27-2005 21:02:51




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 Re: old engine to make air compressor in reply to soupy, 04-27-2005 18:04:05  
Fifty some years ago Sears sold an air-compressor kit that had a check valve device to replace one spark plug. With the engine running, the valve let air into the cylinder during the intake stroke and closed during the compression stroke, this forced the compressed air into the air hose. You would be better off using something that was built to compress air than doing it that way. You may have a long way to go in developing your driver for the compressor. An air cylinder and a wind mill might be a better route to take then the water power.

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rockyhawaii

04-27-2005 20:29:32




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 Re: old engine to make air compressor in reply to soupy, 04-27-2005 18:04:05  
would the screw-in valve from an engine compression tester work?



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Farmered

04-28-2005 04:13:05




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 Re: old engine to make air compressor in reply to rockyhawaii, 04-27-2005 20:29:32  
Your auto parts supplier has an adapter from spark plug threads to 1/4 pipe thread. It is called an "air hold" and is used to hold a valve in place for spring R&R without removing the head. You would need a check valve as close to the adapter as possible. I don't think 50 lbs of water pressure would even turn your engine over without even pumping air.



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JL Sargent

04-27-2005 20:02:28




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 Re: old engine to make air compressor in reply to soupy, 04-27-2005 18:04:05  
50lbs of water at what volume? You see its much more than a pressure problem. Also engine resistance to movement is great. Got a 12ft water wheel laying around and the pond 100,000 cubic feet? That could make some big air.



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Farmered

04-28-2005 04:22:50




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 Re: old engine to make air compressor in reply to JL Sargent, 04-27-2005 20:02:28  
Either that or a water powered turbine (Pelton wheel). Either one would take a large volume of water. Keep thinking, that's how great inventions were made. Ed



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Farmered

04-28-2005 04:21:13




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 Re: old engine to make air compressor in reply to JL Sargent, 04-27-2005 20:02:28  
Either that or a water powered turbine (Pelton wheel). Either one would take a large volume of water. Keep thinking, that's how great inventions were made. Ed



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