1. it would not be unusual to lose a little volume at higher pressures, especially before the new rings have fully broken in... but not necessarily just during that period. Also it is entirely possible that the motor speed is dropping a little at the higher pressure load. If you have or can borrow a mechanical tachometer that pushes against the center of the motor shaft you can detect that.SurfLung wrote:Compressor Fill Rate and Pressure
- Before re-ringing my RIX SA-3E compressor, I had thought it was filling tanks at around 2.5 cf/min. Then AFTER installing new rings, I tested it by filling my twin 38s from zero to 2000 psi. That's 84 cf and it filled them in 29 minutes. That's 2.9 cf/min.
- Then last weekend I filled 3 AL80s to 3000 psi, 1 steel HP80 to 3000 (65 cf), and 1 steel 72 to 2500 psi. My calculations figured the fill rate at 2.4 cf/min. 377 cf filled in 2:36... 156 min. 3 of the tanks were at or near empty.
- So here are my questions:
1. Does the fill rate slow down at higher pressures?
2. Or, does the fill rate go slower when tanks are nearly empty?
Good idea... I just ordered one.luis wrote:You can get a non-contact laser optical tachometer for as little as $12. With one of this, you don’t have to guess at RPM or RPM change as a function of pressure/ motor load. You can also get contact tachometers for similar price, but for this application I would get a non-contact.
https://www.amazon.com/Pyle-PST43-Preci ... X0AZ3Y1E6S
Yeah... that is kind of how I feel about contact tachometers. I have used them, but I have a lot of respect to moving machinery. I like my fingers...antique diver wrote:Thanks for the info on the laser tach, Luis. I didn't even know they existed.
In the interest of safety and convenience I will be retiring my old fashioned contact tach while I still have all my fingers. I sure learn a lot from this forum!
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