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Old 09-11-2006, 11:50 AM
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whats the safe running temperature for air a compressor?

Whats the safe running temperature for a air compressor? i have a 20 gallon 5hp(peak) Campbell housefeld unit and the cylinder head was at max 258 degrees Fahrenheit today and the motor was around 120.

Or do you guys even bother checking?

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Old 09-11-2006, 05:24 PM
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After running the compressor for 12 min straight my valve area was about 260*F, the cylinder area was 150*F pump body area was 85*and tank temp was right at 100*F. This is with the breakin oil which is mobile Rarus 427, after breakin will go to Amsoil ISO 100 PCK which hopefully will run a little cooler. Motor temp was around 80*, 1" hose was 85* and first 5' of 1" pipe was almost 80* after which temp fell basically back to room temp of 71*. How long were you running it to get that temp?

Steve
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Old 09-21-2006, 12:31 PM
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If I am going to do a big job, and the compressor is going to get a workout, I put a small squirell cage fan blowing directly on the cooling fins of the cylinder. I started doing this after I noticed smoke comming off the cylinder during a major job. So, a what temperature does the grit and grease on a compressor smoke? I dunno, but for me it was too hot. I'd say if you have temp concerns, buy a small fan for it like I did, it works great. I do the same for my welder also.
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Old 09-21-2006, 03:46 PM
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There isn't much of a fan on these things - mine is the vanes on the compressor pulley. And without a supplementary fan runs quite hot - though not as high as reported in this thread.
The compressor should be in a place where there is some sort of air positive circulation and if you want it to live, almost any kind of a fan will help.

My compressor is a 6.5 Peak Hp 30 gallon Lowes/IR unit. They specifically say to not use any detergent oil because it will carbonize. My opinion of this is bull-pucky. LESS CARBON - that is one of the reasons for synthetics. They recommend 30 weight. I'm using 10-40 Castrol Syntec 50% synthetics/50% natural oil. The compressor is now running cooler which means less water vapor in the air lines, and hopefully means a longer life for the compressor, my water traps and my tools. I'll probably change to pure synthetic next time if the compressor survives this experiment. We'll see

Dave
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Old 09-21-2006, 05:16 PM
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I agree about the fan, I have a 36" that I would put on it if it was going to be run heavy. About compressor oil, the mobile rarus 427 I have in it for breakin has a pourpoint of 45* F and the amsoil it will be replaced with has a pourpoint of -45* F. From what I've been told it isn't good for the compressor to run much closer than 20* to the pourpoint of the oil, if it is -25* F I have no intention of being out in the barn. Flash point of this oil is 507* F so it should give good protection unless it is really being abused. Really like synthetic, run it in everything I have.
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