Scavenging

p. pr. & v

1.

(Internal-combustion Engines) Act or process of expelling the exhaust gases from the cylinder by some special means, as, in many four-cycle engines, by utilizing the momentum of the exhaust gases in a long exhaust pipe.

Adj.	1.	scavenging - searching for and salvaging anything useful from discarded material; "scavenging larvae"
	2.	scavenging - searching for and feeding on decaying matter; "scavenging hyenas and vultures"

thrifty