[Shotimes] Rod Bearings/Scratch Head

[Ian Fisher]

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
> 90 Titanium (Cone Killer) Back to everyday duty
> 05 Mazda 6 (Zoom Zoom)
> People sleep peaceably in their beds at night only
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> their behalf.  Orwell
> 
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