Author:
macdows
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Date:
9/10/2017 1:57:41 AM
Subject:
RE: more ford
It would always spin at least a little since you can't eliminate all bearing friction etc. between the input and output of the clutch even when it's not engaged. Imagine the thing was sitting in a perfect vacuum, while there might be a difference in rotation rate during periods of input acceleration/deceleration (due to inertia), the output would eventually catch up due to internal friction of the device and they would then rotate at the same rate. Once you consider that the clutch is hooked up to a fan, and that its job is to move air, that fan absorbs input power by doing work on the air. That'll make it overcome the internal friction of the clutch mechanism which will prevent the output from ever reaching the input's rotation rate, unless it's fully coupled in which case it could just basically be considered a solid shaft.
I can't say I'm familiar with the exact system your truck uses, but I'd imagine it's strictly a mechanical setup. No computer control. Not that it's impossible to have a clutch like an A/C compressor, but I think it's unlikely.
