If you need to create a high vacuum, there are basically two options: turbomolecular pumps and diffusion pumps. Turbomolecular pumps require rotors spinning at many thousands of rotations per minute ...

The three-stage scroll vacuum pump from Air Squared Inc., Broomfield, Colo. (www.airsquared.com), can produce vacuums up to 5 mTorr (6.5 × 10-6 atm) without a turbopump. That’s about 10 times the ...

Cummins’ 5.9L diesel engines have many wonderful traits, from the simplicity of their design to the durability and reliability of their internal components. However, the powerplants also have parts ...