At 01:30 PM 1/7/2007, you wrote: >A look at Lycoming and Continental engines shows their intake >runners run THROUGH the oil pan to get heated air by picking up engine heat >from the oil. ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Lycoming yes, Continental engines, no. At least on the small ones up to the 0-200 . That's why the Continental's require a good deal of carb heat and the Lycomings don't. My 0-200 intake tubes will only get the heat from the down flow cooling air passing the cylinders and the carb gets little if any heated air past it. I like the Lycoming setup much better for reliability. Larry Flesner