I have been using a portable electric bike pump for years as an air supply to run the engines with. It is so NOISY! Wife hates it. Dog runs and hides. Etc, etc, etc. Who has a slick solution to this dilemma? Requirements: quiet, variable (0 to 80 psi or so), easily attached to the engine, etc.
My Best, Chuck Chuck Walters Twin Lakes Railway CEO http://home.twcny.rr.com/twinlakesrw
