April 2007 Issue
Vacuum Pump Trials: Which Sucks Best?
Sigma-Tek’s new piston pump looks promising, but for now, we’re sticking with vane pumps from Sigma-Tek and Aero Accessories.
Sometimes when we test products, we learn things we would rather not know. For instance, we didn’t know that an ordinary carbon vane vacuum pump gets too hot to touch after three or four minutes at operating speed. We also weren’t aware that on takeoff roll, some pumps are whirring along at 4200 RPM while the prop loafs along at two thirds of that speed. And we definitely weren’t prepared for the ear-splitting screech these things emit at high RPM.
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