I dont know any actual monetary values or environmental impact studies, however, seems to me that if you take an item that already exists and is working just fine (school bus) and send it off to the scrap yard for not being emissions compliant only to use tons of raw materials to make a new school bus the "environment" is losing in the end. I'm no greenie, but I do know that harvesting all of the new materials thru mining or recycling or whatever has a environmental impact as opposed to just keeping the old school bus on the road.
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Today's Featured Article - Engine Valves - Some Helpful Information - by Staff. Intake - On the intake stroke the piston moves doward, sucking in carburized fuel through the open intake valve. Exhaust valve is closed. Compression - With both the intake and exhaust valves closed, the pistons upward stroke compresses or squeezes the fuel into the combustion chamber. Firing - Ignited by the spark, the compressed fuel explodes and forces the piston downward on its power stroke. Intake and exhaust valves are closed. Exhaust valves and seats are exp
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