Originally Posted by PDBreske
One of the images shows the York with a quick-disconnect coupler right at the compressor. Does that mean it can be used without a storage tank? What is the max PSI and CFM for the compressor alone and are these two ratings dependent on the engine RPM or does the compressor have some kind of internal regulator to prevent damage to external systems? Thanks for the post!
A few Yorks had a blow off safety valve built into the side of the compressor. The quick coupler pic was likely just for testing purposes. I would not recommend running one without a small air tank, safety blow off valve set at 175 psi, and a $20 air compressor switch to operate the clutch.
With only a pressure switch, and no tank, the York will short cycle, reducing the clutches life span. Only a few gallon tank is needed, many jeep owners have used old fire extinguisher tanks.
I have used a York to reliably compress air to 250psi. They are capable of over 400 psi, but fittings, and tanks fail at such pressures.
The York 210 series compressor is the largest, and most desirable for compressed air generation. Large 10 cu. in. displacement fills tires fast. Rated at 4 CFM at 90 psi while running at 1200 rpm. Capable of 8+ CFM! Running air tools isn't a problem anymore with this on
I found the displacements of the different York/Techuseh compressors in an old JCW catalog a while ago. Here they are:
Model Displacement (cubic inch per rotation)
F= flange top
R= roto lock
2= 2 cylinder There were a few larger 4 cylinder units, but they were cast iron, heavy, and not worth covering in this article.
3rd and 4th digits - cu.in displacement of air during one rotation
R= right hand suction
L= left hand suction
This assumes a Compressor Pulley of 5" diameter, and an engine pulley of 6" in diameter.
Compressor Cubic Inch Displacement Cubic Feet per Minute Output @ Engine RPM
1000 2000 3000 4000
6 4.17 8.33 12.5 16.67
8 5.56 11.11 16.67 22.22
9 6.25 12.5 18.75 25
10 6.94 13.89 20.83 27.78
York's have a max RPM of around 6000 RPM. This calculation places the output at almost 14 CFM at 2000 engine RPM. For a small gas engine that red lines at 7000 RPM direct driver would be best. However this is faster than we want to be tuning out bus diesel engines.
Even at 1000 RPM of the bus engine, the York will out put 7 CFM, the equivalent of a $400 construction compressor.
For more output without revving the bus engine ,this is where the combo pulleys can act as a overdrive.