In a message dated 12/22/03 9:48:30 AM Pacific Standard Time, taildr...@hotmail.com writes:
> If Bob Hoover is still monitoring this list, maybe he would care to chime > in? -------------------------------------------------------------------------- I've not seen Steve's new engine assembly manual but with regard to CHT sensing, if you'll go to the Fly5kfiles Group, in the Practice Engine folder, under CHT Sensing (or whatever) you'll find some photos showing the stock CHT sensor location and a comparison with some after-market heads. Except for an improperly adjusted meter, I've never heard of a thermocouple giving falaciously HIGH readings. Liv & lurn :-) As a point of interest, the stock sensor location will typically give readings that are higher -- MUCH higher, in most cases -- than you'll get by installing the thermocouple under a spark plug. -------------------------------------------------------- The metallurgical thingee with cast aluminum heads is rather interesting. Unlike most other metals, aluminum (and a few others) display what foundrymen call 'white shortness' in that when the temperature reaches the lower edge of the plastic range, the metal stops being malleable and goes through a brittle phase. If subjected to stress during that phase it breaks apart like a sugar cookie... and will crack very easily under even moderate amounts of strain. This is a decided advantage for those of us who make an occaisonal casting since we can break up a big crankcase or transmission housing by simply heating it up and tapping it with a hammer, giving us chunks small enough to fit in a crucible or melting pot. But it can produce some painful surprises for the fellow who regularly exceeds the recommended peak CHT :-) -R.S.Hoover
