tech: engine balancing - why dont our engines have balancer shafts?

[amalventano1@comcast.net (Allyn)]

The mere use of a balancing shaft cant possibly be licensed. its too wide a topic for a patent in
this situation. The only way to compensate for 2nd order force in an inline 4 cylinder without
making other vibration is by using 2 balancing shafts. As long as the numbers are correct, there
would be 0 block movement in any direction (the 2nd order force in an uncorrected engine causes a
vertical movement). After some research my guess is that vw figured the engine was smooth enough.
Al

Allyn Malventano, ETC(SS), USN
87 Rieger GTO Scirocco 16v (daily driver, 170k, rocco #6)
86 Kamei Twin 16V Turbo Scirocco GTX ('it has begun', rocco #7)
87 Jetta 8v Wolfsburg 2dr (daily driver, 260k, 0 rattles, original clutch, driveshafts, wheels :)

----- Original Message -----
From: "Ron Pieper" <rapieper@yahoo.com>
To: "Allyn" <amalventano1@comcast.net>; "audley wilson" <amwilson@andrew.cmu.edu>; "scirocco list"
<scirocco-l@scirocco.org>
Sent: Monday, April 15, 2002 7:45 PM
Subject: Re: tech: engine balancing - why dont our engines have balancer shafts?


> IIRC, that technology belonged to Mistubishi, and I assume that they
> licensed it, and for some reason VW didn't/couldn't do it.  That's
> right off the top of my head...facts are welcome here...
>
> Ron
>
> > <amalventano1@comcast.net>
> > > wrote:
> > >
> > > >     As the topic states, why dont our engines use balancer
> > shafts? To
> > > > perfectally balance a 4 cylinder engine, you must eliminate the
> > 2nd order
> > > > force generated by the pistons unequal opposition (piston near
> > bottom
> > > > moves less than piston near top - for a given crankshaft
> > rotation).
> > > > The big reason i am asking this is because our engines dont seem
> > all too
> > > > vibration prone as compared to an engine that employs a balancing
> > shaft
> > > > (i.e. the 2.0 DSM engines).     Now before some of you try to
> > think up a
> > > > way to add balancing shafts to our engines, realize that to
> > eliminate the
> > > > 2nd order force, a balancing shaft must rotate at twice the speed
> > of the
> > > > crank.
> > > >     Another wrench to throw in the works is that the balancer on
> > my talon
> > > > was 1:1 driven from the crank, but had internal gearing such that
> > the
> > > > balancer spun at half the speed (i.e. just like the cams).
> > > >
> > > > Allyn Malventano, ETC(SS), USN
> > > > 87 Rieger GTO Scirocco 16v (daily driver, 170k, rocco #6)
> > > > 86 Kamei Twin 16V Turbo Scirocco GTX ('it has begun', rocco #7)
> > > > 87 Jetta 8v Wolfsburg 2dr (daily driver, 260k, 0 rattles,
> > original
> > > > clutch, driveshafts, wheels :)
> > > >
> > > >
> > > >
> > > > _______________________________________________
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> > > > Scirocco-l@scirocco.org
> > > > http://neubayern.net/mailman/listinfo/scirocco-l
> > >
> > >
> > >
> > >
> >
> >
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