Date: Thu, 2 Dec 1999 07:13:26 -0600
Reply-To: Darrell Boehler <midwesty@MIDWEST.NET>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Darrell Boehler <midwesty@MIDWEST.NET>
Subject: Re: Engine balancing
Content-Type: text/plain; charset="iso-8859-1"
Hi Bulley,
I couldn't agree more. I feel that balancing will probably pay for
itself in fuel savings and they are so smooth. I have never driven or
rebuilt a vw boxer with a counter balanced crank but think that a counter
balanced crank eliminates the crank whipping action created at high rpm,
like above 4k rpm. During rebuilds, I have noticed that wasser boxers
don't seem to beat out the #2 main bearing as much as the air cooled 2L air
boxers.
Darrell Boehler
Bulley says about balanced engines
> Good luck, it is the best money you will spend when rebuilding.
>
> G. Matthew Bulley
> Bulley-Hewlett
> Corporate Communications Counselors
> www.bulley-hewlett.com
> Cary, NC USA
> 888.468.4880 tollfree
>
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>
> -----Original Message-----
> From: John Rodgers [SMTP:inua@SCOTT.NET]
> Sent: Wednesday, December 01, 1999 11:47 PM
> To: vanagon@GERRY.VANAGON.COM
> Subject: Engine balancing
>
> Can anyone explain to me the process/procedure for balancing the
> internal parts of an engine....pistons, rods, etc, and dynamic balancing
> of the entire rotating assembly.....pistons, rods, crank, flywheel and
> clutch plate. How do they do that on automotive engines? Do machine
> shops literally grind a little material off the piston skirts or some
> other place until the pistons match the lightest one in the bunch? Is it
> similar for rods. Where is the typical location to remove material? What
> considerations must be given in each case? How would one balance a
> crankshaft? And where would the metal be removed? And what do you look
> out for?
>
> Years ago I used to balance cranks and aircraft propellers some. The
> cranks would be put on a knife edge device and if something was not
> right it would roll right over with the heavy side down. Propellers same
> way. A stub shaft was mounted through the hub assembly an the whole
> thing set on a knife edge. It would always rotate to heaviest side down.
> In some of the propellers you would add lead wool to hollow bolts to get
> the balance right, or add or remove lead washers in certain parts of the
> propeller.
>
> But i have no idea how it is done in the automotive world.
>
> Any input would be appreciated.
>
> Thanks,
>
> John Rodgers
> "88GL driver wannabe
>
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