Balancing and i5

[Jason Gray]

According to the article below, (neat article)
http://autozine.kyul.net/technical_school/engine/smooth2.htm#Inline-5

The I-5 engine is balanced in terms of first and second order forces.
Compare this to the description of balancing a V8 at:
http://autozine.kyul.net/technical_school/engine/smooth4.htm#V8

You should see that the I-5 does not require crank bob-weights to be added
(like a v8) to simulate the weight of the pistons/rods when you are
dynamicaly balancing the crankshaft. So long as the crank, flywheel, clutch,
pulley/dampener are all each individualy dynamicly balanced, the complete
rotating assembly should be balanced. (Should be any need to use two
conterbalanced components of the rating assembly to cancel eachother out.)

Jason K  Gray
Wasilla Alaska
________________________________________________________________

Hi Bruce,
        First thanks for your input. No surprise as the rotating parts are
all balanced together. This is the process the balance
shop follows as I recall they explained to me.  They weigh the pistons, rod
big ends, rod small ends and grind off material so all
big ends weigh the same, all small ends weigh the same and all pistons
weight the same.
      They dynamically balance the crank much like tires are balanced. They
then add the flywheel, the pressure plate, the pulley to
the crank shaft one at a time, and dynamically balance after each addition
by grinding or drilling iron from each piece as it is
added.
         Here is my concern. Some engines, the mopar 340 cid comes to mind,
use the pulley as  harmonic balancer and also use the
flywheel or  torque converter as counter balances to internal parts.  I
thought maybe the i5 is like the 340 in this respect. Some
engines require that weights be added to the crank rod throws during dynamic
balancing.  Possibly this particular shop has not
previously balanced i5 engines. They do mostly detroit, (and many tractors,
I live in the midwest)  however they have balanced
several vw engines for me with very good results.
    As I stated in my earlier post this is my first i5 rebuild. I am
concerned at the amount of iron removed from the pulley.  It
appears they removed as much iron from the pulley as the tang would weigh.
I would like for this mc engine to sing long and strong,
not shake and bake when I get it installed into my 5k wagen.

Thanks

Darrell




----- Original Message -----
From: "Bruce Bell" <bbell at surview.com>
To: "Darrell Boehler" <midwesty at midwest.net>; <quattro at audifans.com>
Sent: Thursday, February 28, 2002 10:42 PM
Subject: RE: Balancing and i5


> I'm a little surprised. the internals, crank, rods and pistons,
> should be balanced together and the external pieces, damper,
> flywheel & clutch should be true unto themselves. This way if
> some bloke doesn't torque the front pulley correctly, you don't
> have to re-balance the motor when you replace it. BTDT
>
> Bruce
>
> > -----Original Message-----
> > From: quattro-admin at audifans.com
> > [mailto:quattro-admin at audifans.com]On
> > Behalf Of Darrell Boehler
> > Sent: Thursday, February 28, 2002 3:02 PM
> > To: quattro at audifans.com
> > Subject: Balancing and i5
> >
> >
> >
> >  Hi All,
> >     I am a newbe to the i5 look for balancing
> > experience.  I recently had the moving parts on an MC
> > engine dynamically balanced.   I
> > notice the shop took  quite a bit of weight off the
> > pulley /vibration damper  on the flange side. The
> > flange or tang is what a
> > special wrench would use to hold the crank from
> > turning while removing or torqueing the pulley bolt.
> > Is it normal that a  balance
> > shop would remove a lot of weight in this area of the
> > vibration damper.
> >
> > Thanks
> > Darrell
> >
> >
> >
> >
>





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