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The Mt lion was a clean install, on a new hd. (and thus the scmfan was a new install to that same new hd - there being just the one on my machine.) In point of fact, the fan was running at the speed I mentioned (this I'm judging by the sound it was newly making under the MtL, before I installed the scmfan software,that was why I tried it - it simply allowed me to see the speed. I am Running 4 G ram. I just uninstalled the scmfan as a test, but the new, higher, sound level is the same - indicating to me that the speed of the fan is the same.
Does the machine have it's own way (accessible to me) of regulating fan speed? If the MtL produces less heat, I should be able to lower levels of speed and sound.
And a question I might be asked, the old hd was a 5 1/2 WD and it was replaced by a hybrid laptop drive that by all rights produces less heat as well.
Sound is humming along...
Thanks, mafac