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

[amalventano1@comcast.net (Allyn)]

its all on paper right now, man. i've got 90% of the parts i need, including the car, just need many
many man hours at this point.
Al

----- Original Message -----
From: "audley wilson" <amwilson@andrew.cmu.edu>
To: "Allyn" <amalventano1@comcast.net>
Sent: Monday, April 15, 2002 3:33 PM
Subject: Re: tech: engine balancing - why dont our engines have balancer shafts?


> hey do u have any pictures of ur twin engine car... about how difficult was
> that conversion...
>
> --On Monday, April 15, 2002 3:30 PM -0400 Allyn <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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>
>
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