Mr Google really didn't answer my question. Perhaps I just couldn't find the info, but I did try. Still would like to know.
Engines like the V12 RR Merlin, Packard,Allison etc all had a little stub exhaust about 3 or 4 inches long. You could see the port inside. They went REAL GOOD.
Surely someone will come up with a detailed answer.
regards,Rod.
That goes with what I stated earlier, military planes, P-51 Mustangs are high performance, they tried the best they could so they could outrun the enemy and carry heavy loads.
The short stacks on the Merlins P-51 Mustangs are made as not to create any back pressure, those engines you mentioned had superchargers available IIRC, but they all did not have them.
I just know Continental, Lycoming, opposed 4 & 6 cylinder air cooled engines, had terrible cylinder head designs.
Turbocharged, they ran low boost.
TSIO 540= turbocharged injected opposed , something like that.
540 cubic inch 6 cylinder I dont know if you think 230 to 350 horsepower out of 540 cubic inches is high performance, but to me, that is not high performance.
More info here.
http://en.wikipedia.org/wiki/Lycoming_O-540continental 0-200 100 hp from 200 cubic inches.
http://en.wikipedia.org/wiki/Continental_O-200 Fuel
http://en.wikipedia.org/wiki/Avgashttp://www.shell.com/global/products-ser...ypes/avgas.htmlMBHD
