<VV> Re: [FC] [VV] Harmonic balancers....

[Merv Krull]

So the answer to my original question is, "Yes, a harmonic balancer (damper) 
is good for 164 ci engines: not necessary, but would not hurt a 145"
Which leads to another question that I reworded from Rick... "Does one size 
harmonic balancer fit all, or are they different for 95s, 98s, 102s, 110s, 
140s, and turbos?"
toodles
Merv KRull
Salmon Arm, BC

----- Original Message ----- 
From: <BobHelt at aol.com>
To: <ral1963 at comcast.net>; <noahsarkinc at earthlink.net>; 
<krupross at sunwave.net>; <corvanatics at corvair.org>
Cc: <virtualvairs at corvair.org>
Sent: Saturday, June 30, 2007 11:22 AM
Subject: Re: <VV> Re: [FC] [VV] Harmonic balancers....


>
> Rick, please see below.
> Regards.
> Bob Helt
>
> In a message dated 6/30/2007 9:15:00 AM US Mountain Standard Time,
> ral1963 at comcast.net writes:
>
> Has any  thought been applied to using or not using HB on larger than
> 164cu  motors?
>
> Depends on who is asked.
>
>
>
> Was it the longer throw of the stroked motor that required the  HB?
> That is part of it. It really is based on the fundamental frequency of
> oscillation of the crank (222 Hz for a stock 8409). This is dependent on 
> many
> factors. Then as Lon points out it is also based on the strength of impact 
> too (f
> orce of the piston on the power stroke). Plus of course the frequency of 
> the
> incoming power strokes that coincide with the crank's natural frequency
> causing a build up of oscillations until a crack is 
> developed/expanded/causes
> failure. (remember the Memorex glass breaking?)
>
> Set a crank on end or suspend from a wire and gently tap it with a 
> hammer.
> You will hear a  ringing sound which is the crank vibrating at its
> fundamental freq. But as with all vibrating objects, there will be 
> oscillation  nodes
> and these result in vibration harmonics. Study sounds from  piano wires 
> for more
> info.
>
>
>
> If you stroke a 164 motor, will the stock HB still function?  Would the
> harmonic's and damping effects still cancel themselves  out?
>
> Most likely you will require a new HD based on the new crankshaft. The 
> stock
> HD is likely insufficient to protect the stroked 8409 crank.
>
> Regards,
> Bob Helt
>
>
>
>
> Rick Loving
>
>
>
>
>
>
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