GM refers to the Roots blowers on the intake side of their 2 stroke
diesels as "scavenging air blowers", purpose is to keep exhaust moving
in the proper direction during time when intake ports and exhaust
valves are open at same time [overlap]. Another interesting fact;
turbos on their 2 stroke locomotives are gear driven with an overriding
clutch [think old Saab free wheeling deal design on massive steroids] up
until 6th or 7th out of 8 notches [speeds] for same reason of exhaust
flow direction until exhaust heat/pressure builds enough to take over.
Ed [also likes 'puter time with morning coffee]
Purinton
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