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Engine/compressor again

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JimC

01-28-2001 14:35:36




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OK after reading the posts below, it got me thinking, what about using a tractor PTO to drive the engine from the back side. Adapt the intake manifold to bring in the air, use piping at the spark plug holes to a tank.Water pump should still pump enough to keep it cool with a small tank for storage of the coolant. I realize that you would have to play with the valves to keep the exhaust from flowing out the exhaust manifold, would just taking the push rods off the rockers (cam) work?
Like someone below said, if it was that easy everyone would do it

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Gordon in IN

01-29-2001 16:58:37




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 Re: engine/compressor again in reply to JimC, 01-28-2001 14:35:36  
If you want to drive the unit with external power, then get a I/4 speed roller cam and followers for your engine/compressor. These were popular for high end "hot rodding" a "few" years ago. Install in your engine that you are using as a compressor BUT TURN IT AT THE REGULAR 1/2 Crankshaft speed, use standard sprockets and timing chain. This will give you the proper valve action for an intake on every stroke and an exhaust on every stroke in each cylinder. If you want to use one engine and use half for the drive power and the other half for the compressor, the key is to get a special "comperssor" camshaft for the engine that provides the standard valve action for the "engine" cylinders (so it will run). This camshaft also must provide a special cam/valve action for the compressor cylinders that provides that the "compressor" intake valve opens every time the "compressor" pistons go down and the "compressor" exhaust valves opens every time that the pistons come up. Inline four cylinder engines or FORD V8 engines usually work best and smoothest. Check the firing orders and you can see why. You want this device to alternately fire one cylinder and pump two cylinders. The "engine" cylinders fire every other revolution, but the "compressor" cylinders pump air every revolution (if you want it to be efficient). You might want to use a heavy flywheel as well. I think you will find that this is why the commercial units of this type work as well as they do. You might be better off finding a used commercial compressor of this type that needs rebuilding and "rebuild it" instead of trying to "build one". Good luck, Gordon in IN

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JimC

01-28-2001 15:07:52




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 Re: engine/compressor again in reply to JimC, 01-28-2001 14:35:36  
OR, would it work easier the other way, blocking off the intake, suck the air through the spark plug holes, exhaust compressed air through the exhaust manifolds???



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rhudson

01-28-2001 16:57:32




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 Re: Re: engine/compressor again in reply to JimC, 01-28-2001 15:07:52  
i guessing its just like a HP engine, get as much air in it as possible. so that would mean using the intake valve as an intake. or could you just block off both valves, drill and tap a NPT (about 1") fitting where the plug hole was. then tee into each cylinder with check valves.
i wish one of you fellows would try this so i could build one.



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ltf in nc

01-28-2001 19:34:42




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 Re: Re: Re: engine/compressor again in reply to rhudson, 01-28-2001 16:57:32  
Use both the intake and exhaust valves for air intake by installing weak springs on the valves. Direct the compressed air out the spark plug holes through checkvalves to a storage tank. Cooling will be a problem on the exhaust side but incoming air will cool the inlet valves. Seal off the intake air source to stop the compressor for pumping when the tank is full



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rhudson

01-29-2001 08:43:42




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 Re: Re: Re: Re: engine/compressor again in reply to ltf in nc, 01-28-2001 19:34:42  
sounds good. i guess the check valves could be at the end of a pipe nipple so there could be some air cooling before the compressed air reached the CV. LTF, might you be from around henderson/roxboro area?



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ltf in nc

01-29-2001 20:54:33




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 Re: Re: Re: Re: Re: engine/compressor again in reply to rhudson, 01-29-2001 08:43:42  
Nah, I farm East of Statesville and north of Dale Earnhardt in one of the last pockets of rural area.



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