Quote:
Originally Posted by HiFlite
Again, the world has changed since 1985, or 1965, or 1945. Engine Management Systems, direct fuel injection, variable valve timing, and so on have 300 ci engines going from 100 hp to 350 hp with a doubling of mpg's and a reduction of controlled emissions by 99%. High backpressure at low rpm was a kludge then (  ) and has no benefits now. |
*yes,everything you've mentioned was foreshadowed in 1973.We just didn't have the technology at that time.
*If you have a contemporary textbook on internal combustion engines and air pollution,we might mine that just to see what engineering students are being exposed to today.
*The Yamaha tests results indicate a benefit from valving the exhaust tract in the 21st-Century.Is that a black swan?
*The engine dynamometer and chassis dynamometer testing indicates conditions under which an arbitrary back pressure reduction can lower engine performance.The exception proves the rule?