by mbta1051dan
I was wondering if anyone knew anything about the engine-driven cooling fan on EMDs. They can become quite loud at times, especially on SD40-2s, where the sound is a single noted whine, about the same pitch as the engine on a 16 cyl, and having eight or nine blades. The newer 710 fans have a low and high pitch whine, seperated by two octaves, and are not the same pitches as the engine. Rather, they are a fifth up from the engine pitch. I were told that newer EMDs have the "Q" type cooling fan, with five unevenly spaced blades, but it doesn't sound like this. I've been in the engineroom of an F40 (idling, of course) but I can't find the fan. Does anyone know where it is, or have a picture of one in relation to the prime mover?
-Dan
-Dan
MBTA 1051