Glen,
I am no expert on this stuff, but I have to say YES, you are getting
hosed. Seems to me you need the rods and the pistons, rings etc to
balance the engine. I think you also need the crank. And perhaps the
flywheel. I know when I had this done on a now broke motor, they
wanted everything. Broke for an entirely different reason.
I can see why the rods would be different. The object, as I
understand it, is to get all the throw weights the same. And I do
believe that includes the counter-balances formed into the crank.
I could be a crank on this, but I don't think so.
Larry
On Jun 10, 2005, at 7:12 PM, Glen Byrns wrote:
> Is there anyone on the list with knowledge of correct technique for
> dynamic
> balancing of internal engine parts?
>
> I got back the crank, rods, pistons, flywheel, pressure plate, and
> harmonic
> balancer for the 948 I'm building for the Austin A35. They had
> mixed up the
> #2 and #3 rod before balancing. Since the #2 rod cannot be used in
> the #3
> position, I called and asked what they needed to redo the balancing
> with the
> rods in the correct positions and they replied that they only
> needed the rods
> back. This made me damn suspicious that they are full of crap. I
> took the
> rods to work and weighed them on an accurate balance with the
> following
> results:
> #1-----644.0g
> #2-----647.5g
> #3-----657.5g
> #4-----661.0g
>
> There may be some reason that the rods can be of such different
> weights and
> still have a dynamically balanced engine I guess, but I thought
> step #1 was to
> match the weights of all the rods and pistons BEFORE the dynamic
> balancing is
> begun.
>
> Am I getting hosed?
>
> Glen Byrns
--
Larry Macy
78 Midget
Keep your top down and your chin up.
Larry B. Macy, Ph.D.
macy@bbl.med.upenn.edu
System Manager/Administrator
Neuropsychiatry Section
Department of Psychiatry
University of Pennsylvania
3400 Spruce St. - 10 Gates
Philadelphia, PA 19104
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does what I expect and want a computer to do.
Stewart Alsop, FORTUNE, Monday, June 25, 2001
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