When I rebuilt my 1275, I took it to a machine shop, that did a 'dynamic'
balance of the crank flywheel, and front pulley. They had a 'special' machine
that the crank rested in, with a digital read out, that could detect very
subtle
differences in balance. I notice that they removed material from, most of the
counter weights. I also had all the piston assemblies also weighed and
balanced.
I think there is a section on lightening the crank in Vizard's book also.
- Bryan Vandiver (59-bugeye)
>Subject: Crank Counterweights
>To: spridgets@autox.team.net
>MIME-Version: 1.0
>
>List,
>
>While at the machine shop today saw an article on 1275 cranks which claimed
>that these cranks had to much weight around the journal center lines. That
>this extra weight caused uneven bearing wear. It was interesting because
>they pictures of this wear was a very good match to the odd wear patterns on
>the bearing that we just removed. The suggested solution was to remove
>counter weight material near the journals yielding a more triangular shaped
>counter weight. Anyone heard of this or tried it??
>
>Bob and Annice
>1960 Sprite (Mk IV indiguise)
>1966(7) Sprite Mk III (in progress)
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