> It was not cheap to have the radiator recored with the hole,
> not an easy job.
That's odd. My radiator guy said it was no problem and would only add $25
or so to the cost of the recore.
> purchased one that
> pushes through 1000CFM.
Is that free air, or with the restriction of the radiator? Not unusual for
the flow to drop by 20% or more when there is a radiator involved (and what
good is a fan without a radiator?).
> I have done a bit of research on the internet but can't decide whether
> removing the fan hub extension will upset the motor or
> whether the plastic
> fan had already done that.
The fan extension should play no part in balancing the motor. The original
weights were to balance the fan & extension, not the motor itself. There is
a school of thought that says the original metal fan & it's rubber bushings
provided some measure of harmonic dampening; but deleting them on a
street-driven motor does not seem to be a problem. I've been running that
way for almost 30 years, and never broken a crankshaft. If you are going to
be turning over 5000 rpm for any length of time (eg racing), then it might
be wise to add a dampener.
But it is important that the pulley hub be firmly clamped in place. I wound
up having to make a special clamping piece that would reach around the end
of the crankshaft nose and bear only on the pulley hub. Even better would
be a larger piece that fills all the way out to the bolts for the pulley
halves, which I believe is available from several vendors.
-- Randall
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