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  #11  
Old 09-09-2020, 09:11 PM
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The compressor arrived today. All outlets were capped off. The outside castings looked great, no tool or rub marks. I pulled off the intake header and the screws are spotless, not a scuff, or minor imperfection.

The intake valve looks to be opened with vacuum (spring to close when off), then closed with air pressure. There is some sort of spring balance and screw to adjust.
There is an oil feed coming from the separator tank that apparently uses tank pressure to blow the oil back, through a filter to the intake at the compressor pump. There is an oil drain line that takes the oil that runs to the bottom of the screw cavity back to the separator tank. This runs at head pressure, so slightly more than tank pressure. Then there is the high pressure air/oil line to the separator tank.

Aside from the clutch and a pressure transducer, I see no reason it couldn't be run without the thousand dollar electronics package, as there are no electric controls on the pump.

The separator tank with the blow down valve should be here early next week.

I did put in for a quote for the install parts, including the electronics package. After I see that I will know if I am making my own bracket and controls or buying them.

I did get a good look at my accessory drive set up. There is a large cast aluminum bracket that the PS pump and alternator mounts to. If I remove that and do a minor but of machine work (could be done with a sander if needs be) I could make a bracket. Likely take about 5 hours to uninstall, construct and reinstall.Click image for larger version

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  #12  
Old 09-11-2020, 05:04 PM
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You said you were going to need a oil cooler. That jogged the memory banks. A friend of ours had a Speed Shop with her husband before he passed from cancer. She brought up a load of stuff for me to try to sell which is rat-holed in the shed somewhere. I know there are at least a couple coolers made by Earl's I found pics of 2 NOS still in the box. If you are interested I will do a search to find them. I actually think there are more maybe 4 total of various sizes
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  #13  
Old 09-11-2020, 09:55 PM
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The oil cooler I am seeing as typical for this are the brazed plate coolers that have coolant running through them. Why the difference I don’t really know, could be the pressure, as the oil would be at 175 psi. With that pressure I would think a little nick in the aluminum would be the death knell for it, and messy too.
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  #14  
Old 09-12-2020, 08:41 AM
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Ah, OK I did not realize they would be operating at that high a pressure. You are correct these wouldn't cut it for that.
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Old 09-12-2020, 06:16 PM
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I finally got an email back from a VMAC dealer, $3,901 for the factory parts. $1165 just for the bracket.

That stuff is all beyond my desire to pay, so I will be making my own. The crank pulley is $175, which, while certainly not cheap, isn’t horrid. So, do I want to run off the larger crank pulley with a dedicated belt, or the smaller factory pulley with the factory drive system? I am leaning toward the factory drive system.

I have found out some things about the engine control. The VMAC engine controls are $1600. They have a drive system interlock, parking brake switch, temp sensors, pressure transducer, etc.
There are, apparently, a handful of companies that make dole controls for gas and diesel engines for emergency vehicles so they can sit running for hours with all their stuff running. These have varying degrees of control for $150-$250. They do not have all the safety interlocks. I am fine with that.
There is also a factory PTO idle speed option. This woul need a $175+/- reflash of the body control module of my truck. This would make idle control available using the cruise control buttons.

I don’t know how important overheat protection is. I can’t imagine parking brake, cab temp, blah, blah, blah is, but I can’t imagine that it is any other than lawyer controls.

I am leaning toward an aftermarket idle control, and maybe putting a temp switch inline with the clutch wiring.
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  #16  
Old 09-12-2020, 07:54 PM
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Walker, I have dealt with the whole VMAC control system on Port-A-John trucks with Powerstrokes they are a PITA. Oops won't engage didn't stomp on the parking brake enough. Ahh hell the lights aren't on. Random Brain Farts where it will throttle the truck up to like 4200 Rpm (which isn't happening). Or it will just flat out won't do shit with no way to diagnose what is wrong. Stay far far the Fuck Away from VMAC. Keep your personal system on your rig as barebones simple as you can. I would look into the Over-Temp option if it isn't too pricey. All the other VMAC shit is basically corporate CYA to allow them employ Knuckle-Draggers . Just reread your post the RPM control tied into your cruise control is nice I would pick up on that if you can for not a lot of $$$$
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Last edited by Whitetrash; 09-12-2020 at 08:01 PM.
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  #17  
Old 09-14-2020, 09:08 AM
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I have a vernier throttle cable I'd be willing to donate to the project if you think it would help. I use it to control the engine speed on my deuce while winching and have put them on some mowers too. The overall length is very short, but it is easy to tie into anything mechanical, like a throttle cable.
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  #18  
Old 09-14-2020, 09:29 AM
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My truck is all fly by wire. I ordered a little black box last night for a hundred bucks. It gives me 2 adjustable preset speeds with the flick of a switch. I am hoping I can put speed 1 in the on/off circuit, and speed 2 on a pressure switch. I am just not sure if it will allow both presets to be on at the same time.

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  #19  
Old 09-14-2020, 10:38 AM
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Andy, in the past you were running an engine on your compressor in the back of the truck, if I recall.
Have you considered not strapping this thing to the truck engine? Maybe a 25hp twin would pump all the cfm you need.

You definitely can cool oil with an air cooler, I think it's doable.
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  #20  
Old 09-14-2020, 02:28 PM
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I put a new tank under my compressor a year or two ago, it is a 10 or 12 horse Kolher and the pump is a speed wire clone. Both are starting to show their age (early 80s IIRC). I think now that putting a new tank on was maybe a false economy, as the motor is starting to smoke and I am getting a lot of blow by on the pump.
The thing I really like about this screw compressor is it’s compact size. It is about the size of an overgrown A/C compressor.
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