<VV> Rod caps and balancing
RoboMan91324 at aol.com
RoboMan91324 at aol.com
Wed Jun 11 14:04:23 EDT 2008
Bob (and anyone else)
I didn't know that Chevy balanced the rods only in pairs but thinking about
the design of our "boxer" engines, I understand why. Is it possible to do as
Chevy did when balancing our rods for performance and just pay attention to
pairs or is there a possible harmonic problem? ..... or other issue?
Thanks in advance,
Dave
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 6/11/2008 9:01:05 AM Pacific Daylight Time,
virtualvairs-request at corvair.org writes:
> Message: 8
> Date: Wed, 11 Jun 2008 11:55:31 EDT
> From: BobHelt at aol.com
> Subject: Re: <VV> Rod caps and balancing
> To: HallGrenn at aol.com, virtualvairs at corvair.org
> Message-ID: <d4a.2fc659a0.35814f73 at aol.com>
> Content-Type: text/plain; charset="US-ASCII"
>
>
> In a message dated 6/10/2008 6:19:49 AM US Mountain Standard Time,
> HallGrenn at aol.com writes:
>
> Anybody with experience building performance engines have any
> recommendations or guidance as to how much rod caps can be ground before
> they become
> too weak?
>
> Bob Hall
>
>
>
> Hi Bob,
> You may already have your answer from Dan. But just in case, I'll add my
> comments too.
>
> As you probably know, Chevrolet just balanced the con rods in opposing
> pairs. Thus there can be a great imbalance from pair to pair. So when you
> want to
> get a set of six balanced there are potential problems because of the great
>
> imbalances between pairs. The balance shops just try to work with what you
> send
> them so thus often you wind up with an excessive amount of material being
> removed in an attempt to balance rods that are way out of balance to start
> with. There is only one solution to that in my opinion and that is to send
> at
> least 18 and better yet 24 rods to the balance shop so that they can pick
> the 6
> that are already closest in balance before they remove any metal.
>
> Now to your question. If you even have the slighest concern that too much
> material was removed anywhere on any of the rods, just toss them and have a
> new
> set balanced. Rods are highly stressed on the big ends and might fail at
> high
> rpms. Of course, if one might fail, it could destroy the engine. So it's
> better to be as safe as possible.
> HTH
> Regards,
> Bob Helt
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