Hi, I've have been chasing this problem with my old bauer k13 and utilus u1 compressors. I find that both compressors run quite hot on the second stage head and discharge. I have recently replaced the second and third stage valves, second stage rings and cleaned up the first stage valves. They appear to run smoothly and I'm running them at about 1000 rpm (u-1 is rated for 1200 rpm). I'm running synthetic oil and the oil pressure is currently slightly high at 800 to 900 PSI. The interstage pressures are about 55 PSI and 500 PSI at 3200PSI output. I thought i had it licked with the new valves, but I guess I didn't run it long enough to see the temperature stabilize. It takes about 10 mins to get to this temp. PMV is set to 2500 PSI.
I have read many positive things about these block being slow turning and cool running so it doesn't make sense to me that i'm reading between 100° C to 120°C using a non-contact thermometer on the discharge side of the head. its maybe 10° or 20° less on the intake side. The intake pipe is running about 45°. Ambient air temp is about 20°C.
I notice that the newer versions of this compressor use a bigger head with more significant cooling fins and also have the axial fan (mine are squirrel cage fans). This indicates to me that they made an effort to cool things down further. I guess I'm trying to figure out if this is just the way things are or if I still have something to fix. Currently I'm running an extra fan on the second stage to keep it down further. Is it possible that I need the first stage to do more of the work? Change first stage rings? new valves? Work on more cooling ( better fan, add some additional heat sinks)? Anything i'm missing?
I have read many positive things about these block being slow turning and cool running so it doesn't make sense to me that i'm reading between 100° C to 120°C using a non-contact thermometer on the discharge side of the head. its maybe 10° or 20° less on the intake side. The intake pipe is running about 45°. Ambient air temp is about 20°C.
I notice that the newer versions of this compressor use a bigger head with more significant cooling fins and also have the axial fan (mine are squirrel cage fans). This indicates to me that they made an effort to cool things down further. I guess I'm trying to figure out if this is just the way things are or if I still have something to fix. Currently I'm running an extra fan on the second stage to keep it down further. Is it possible that I need the first stage to do more of the work? Change first stage rings? new valves? Work on more cooling ( better fan, add some additional heat sinks)? Anything i'm missing?
