<VV> VirtualVairs Digest, Vol 46, Issue 63

[RoboMan91324 at aol.com]

Bryan,

I do not know if it has been mentioned here but keep in mind that the two 
ends of the rods experience different types of inertial forces.  You might want 
to test and adjust them independently instead of merely weighing the rod as a 
whole.  The piston side of the rod experiences only linear 
acceleration/deceleration (as does the piston) while the crank side of the rod experiences mostly 
rotary (centrifugal) forces.  Of course, the web experiences varied degrees of 
these forces depending on how close it is to one end or the other.  Many 
choose to select and adjust both ends of the pistons independently.  You can use 
two of the cheapo scales you mentioned at the same time or weigh the ends 
independently.  If they are weighed independently, the end not on the scale should 
be supported at about the same height as the part on the scale.  Further, both 
the part on the scale and off, should supported at the same points from rod 
to rod for consistency.  Of course, if you are just going to use the engine for 
putting around town. I wouldn't worry too much about it.  I don't think GM 
did.

Another factor to consider, especially if you can't find 6 rods very close to 
each other is the nature of the boxer design of our Corvair engines.  It is 
more important to get the diametrically opposed pairs of rods identical than it 
is to get all six rods close to identical.  (1-2; 3-4; 5-6) This makes your 
task easier.  Also, if you have enough rods to select from, you might want to 
select rods prestamped one through six just in case you or someone else 
eventually rebuilds the engine again and wants to keep the rods in order during 
reassembly.  I suppose you could carefully restamp them if you have the stamps.

Just a few suggestions.

Doc
1960 Vette; 1961 Rampside; 1962 Rampside; 1964 Spyder coupe; 1965 Greenbrier; 
1966 Corsa Turbo Coupe; 1967 Nova SS; 1968 Camaro ragtop
~~~~~~~~~~~~~~~~~~~~
In a message dated 11/23/2008 9:00:37 AM Pacific Standard Time, 
virtualvairs-request at corvair.org writes:

> Message: 1
> Date: Sat, 22 Nov 2008 21:32:52 -0500
> From: Bryan Blackwell <bryan at skiblack.com>
> Subject: Re: <VV> connecting rod culling / balancing
> To: "Mark Edmonds" <ctmle at sbcglobal.net>
> Cc: virtualvairs at corvair.org, djtcz at comcast.net
> Message-ID: <746CCD6E-0725-4D48-9E7D-4F7D44CFD1D9 at skiblack.com>
> Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed
> 
> Thanks guys.  I found several digital scales on eBay for less than $40 that 
> are in the 600 gram range, just perfect for our purposes based on the numbers 
> Mark posted.
> 
> Armed with Dan's comments, I'll press some rods off the worn out stock 
> pistons and see what I can come up with out of several sets of rods.
> 
> --Bryan


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