On 1 Jul 1998, Gerhard Wiederholl wrote:
> Where exactly is this said crankshaft damper ?
It is at the front end of the engine -- it is the small flywheel with the
markings for the ignition timing (BEFORE/AFTER) stamped along the edge.
> 300 hz eaquals 300 RPM
I think you will find that you are off by a factor of 60. Last time i
checked, "Hz" meant revolutions/vibrations/whatever per SECOND, whereas
"RPM" meant revolutions per MINUTE.
Additionally, a general statement that crankshaft for inline sixes have a
resonant frequency of 300 Hz must be entirely wrong. The resonant
frequency will very much depend upon the weight of the crank shaft, as
well as its radius. The 2.5 crankshaft is indeed a heavy one of
significant throw, and has, according to Kastner, a very nasty resonance
at 6200 RPM.
To the subject at hand: It seems very unlikely that the weight or load of
the fan would contribute in any significant way to the resonance of the
crankshaft.
Egil
merrily running his Triumph without a crankshaft-driven fan for almost a
decade.
--
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