[Land-speed] Re Sorta off-sorta on-topic turbocharger theory

Ed Purinton ecpurinton at wildblue.net
Tue Nov 13 07:03:57 MST 2007


    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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