[Shotimes] Rod Bearings/Scratch Head

[Mike Murphy]

Hey Ian,

I didn't replace the rods I used the same ones so they would be matched with 
the others.

Thanks,
Mike



From: Ian Fisher <dataflash@yahoo.com>
To: John Stout <sho_man1@yahoo.com>, Mike Murphy  <murphymike@hotmail.com>,  
  shotimes@autox.team.net
Subject: Re: [Shotimes] Rod Bearings/Scratch Head
Date: Fri, 14 Jan 2005 15:31:27 -0800 (PST)

Regardless, they are probably out of round now as
well.

Mike-when you replaced the rods, were the letter
stampings the same as the old ones? (A B or C?) I
believe this deals with the size of the rod journal
(what range of spec it's in) but an A rod may differ
in weight enough from a C rod enough that it throws
off the crank balance. I don't have much experience
building engines except for the one I am learning on
so I am not an expert. I just have enough ideas to
make me dangerous with a wrench. I personally would be
wary of swapping rods between motors (esp on a blower
motor) without rebalancing the entire rotating
assembly but that's me...

Ian

--- John Stout <sho_man1@yahoo.com> wrote:

 > Rods are a different size, you probably need
 > oversize bearings
 >
 > Mike Murphy <murphymike@hotmail.com> wrote:Here is
 > one I haven't heard of before...sorry for the long
 > story:
 >
 > On my Supercharged Car the tuning took a dump on me
 > and I backfired through
 > the motor which hair-line cracked two pistons (5 &
 > 6.)
 >
 > I replaced the pistons with two from a parts motor.
 > Present rodbearings
 > looked good and installed/torqued them to spec.
 > Buttoned her all up.
 >
 > Fired her up and got a rod bearing knock (insert
 > cuss words.)
 >
 > I eased her 10 miles over to Texan Tony's house.
 > Pulled the two rod
 > bearings out and they were almost melted/very
 > coppered. Luckily the crank
 > was not scored. Pulled no. 2 bearing out and it was
 > fine.
 >
 > Tony put in brand new rod bearings on the
 > pistons/assembly lubed etc.
 > Buttoned her up to spec and same rod bearing knock
 > again.
 >
 > ?????????????????????????????
 >
 > Thanks mucho,
 > Murph
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 >
 > John Stout
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