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  #1  
Old 09-15-2008, 01:07 PM
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617 Air compressor project

I've often needed a large CFM air compressor and have had tossed around the idea of building one using a spare MB 617.
My plan is to take the air from two or three cylinders by installing check valves in the injector holes and tie them all together for the comp air out. I'm thinking a custom camshaft would be required to open the intake valve every downward stroke of the piston(s). Also, the exhaust lobe would need to be removed to keep it closed (or remove the rocker). The IP injector lines for those cylinders compressing air would be returned to the tank so the IP would still have proper lub to all it's pump elements.

Sitting here scratching my head trying to figure out what cylinder numbers of the two (or three) would allow for smooth running.

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  #2  
Old 09-15-2008, 01:22 PM
ForcedInduction
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That would be an extremely unbalanced engine.
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  #3  
Old 09-15-2008, 02:14 PM
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I don't think that would work....why not just use a normal compressor and leave the engine alone?

Sears has their huge-normous air compressor on sale right now.
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  #4  
Old 09-15-2008, 02:18 PM
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Why not use a 615 or 616...
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  #5  
Old 09-15-2008, 02:27 PM
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I know for a fact fahr-deutz has a fl4912 engine that has one cylinder devoted to being an air compressor.
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  #6  
Old 09-15-2008, 02:43 PM
ForcedInduction
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A 615/616 would be easier because of it's even number of cylinders.

Contact this book company, supposedly they have a book detailing how to do it.
http://www.lindsaybks.com/
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  #7  
Old 09-15-2008, 02:46 PM
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a 617 would an excellent boat anchor as well
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Old 09-15-2008, 05:45 PM
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You could use one 617 to drive a 616 set up as an air compressor - you'd have enough air to run a jack hammer.
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  #9  
Old 09-15-2008, 05:46 PM
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I was just at harbor freight today and they have a big compressor unit (just the compressor piston unit) with twin pistons and a giant flywheel with a fan built into it for like $139. Its an oil lubed unit and requires at least 3HP to run it. You could mount one of those (or two) next to a 616 on a platform and run them with belt drive, that'd be one heck of a compressor! If you used two you'd have a 4 piston compressor!
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  #10  
Old 09-15-2008, 05:57 PM
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My Ford 170 cu. in. 6-cylinder engine lost all compression in one cylinder, so before rebuilding it I disconnected three spark plug wires (every other one in the firing order) to see how it would run on three. It ran, but not very smoothly. I just drove it up and down the driveway a couple of times. I've heard of people plugging the intakes on a few cylinders of an 8 to save gas during the war. World War II that is, the next one after the War to End All Wars.
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  #11  
Old 09-15-2008, 06:10 PM
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Quote:
Originally Posted by Sbean View Post
World War II that is, the next one after the War to End All Wars.
Which was a few wars before "The Mother of All Wars".
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  #12  
Old 09-15-2008, 08:01 PM
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Quote:
Originally Posted by OldPokey View Post
Which was a few wars before "The Mother of All Wars".
.. and spawned The Little War That Couldn't Stop.

Sorry, couldn't resist the off-topid comment

On topic.. prolly work with only one cylinder, but getting it to start on just three might be difficult. Unless you have the 617 lying around collecting dust and a lot of time on your hands you'd probably be better off selling the 617 and using the money to buy a large air compressor or three.
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  #13  
Old 09-15-2008, 11:09 PM
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Quote:
Originally Posted by ForcedInduction View Post
A 615/616 would be easier because of it's even number of cylinders.

Contact this book company, supposedly they have a book detailing how to do it.
http://www.lindsaybks.com/
I agree with this.

To get balanced on a 617 would be tougher.

The first two cylinders to put down is easy....the tough part is figuring out how to get the half!

Tom W
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..I also have a 427 Cobra replica with an aluminum chassis.
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  #14  
Old 09-16-2008, 12:38 AM
SW SW is offline
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how much cfm's do you actually need?
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  #15  
Old 09-16-2008, 01:00 AM
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Quote:
Originally Posted by OldPokey View Post
You could use one 617 to drive a 616 set up as an air compressor - you'd have enough air to run a jack hammer.
Now THAT would be a compressor! Wshew!

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-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 83k - mine - (OC-85,500)
'17 Metris(VITO!) - 13k - wifes (OC-17k)
'01 E320 Wagon - 159k - mine (OC-160,000)
'01 E320 - 179k - dad's (OC-182,500)
'07 E350 Wagon - 131k - dad's (OC-132,500)
'01 SL500 - 51k - dad's (OC-52,000)
'16 E400 4matic Sedan - 57k - Brothers (OC-64,000)
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