York 210 A/C Compressor - can be had at several junkyards or eBay. The best unit to get is the 210L (2 pistons, 10 cb ft volume, long stroke pistons). They produce the most air.
York 6 groove clutch - may be found on the recovered York or via A/C suppliers. Most have a single wire (positive). Ground is achieved via the body of the unit being mounted to the engine block
Manifold Set Up:
Manifold - I went with an 8 port manifold - 6 1/4" NPT 2 3/8" NPT.
The actual manifold I am using:
Attached to the Manifold I have:
4 1/4" 90 degree elbows
1 Viair 90217 Sealed Pressure switch:
1 1/4" to 1/8" NPT conversion to adapt the pressure switch to the 1/4" port
1 1/4" bleed valve
1 1/4" 175 psi safety valve
1 1/4" compression fitting to connect the in cab pressure gauge
Manifold will be mounted to the Synergy ARB Compressor mount. I'll drill some holes to align with the manifold and mount it.
There are two options to mount a York to the JK engine. Kilby and ORO. I went with the ORO mounting brackets. Primary reason was the Kilby is mounted above the engine and requires an A/C line to be moved. Since I'm trying to keep costs down I don't want a $100 charge from a wrench monkey to replace the A/C line. Both kits contain all required brackets, pulleys, belts, etc needed to integrate the York clutch into your engine belt loop. Both are great mounts.
I will be running an air tank with this set up - but it's the only part I haven't defined yet. I'll update when I do.
The York tends to burp oil, and will make a mess of your air lines. To keep this from happening you need a compressor coalescing filter that will separate the oil from the air. This needs to be installed BEFORE the manifold. Optimally you do want this as far from the compressor as possible. The York's do create a lot of heat and giving distance (in terms of hose) helps cool the air. Also note due to the heat, it is wise to get a filter with a metal bowl instead of polycarbinate. The plastics tend to get weak and will eventually fail. I am using 4' of hydraulic hose between the compressor and the filter.
The filters can be sourced from several locations. Again - ORO and Kilby sell them. I got lucky and picked up a lightly used Norgren on eBay for $45. Expect to pay between $100-$150 for a new unit.
The system will have up to 145 psi in it at any time. You'll want the ability to tune that down for air tools or tire filling. I picked up a Viair reg and will place it on the manifold. From there I'll run two hoses for quick connects at each foot well.
Also you'll need lengths of hose to reach Q/C points and the air tank. Depending on configuration the amount will vary.