[Shotimes] Rod Bearings/Scratch Head

[Ian Fisher]

Ah ok

Well in that case, do you recall if the pistons were A
B or C? I am having difficulty remembering if the rods
are marked that way or not but I know for a fact that
the pistons are. They are marked on the top of the
pistons between the valve reliefs. Stupid question but
were the piston wrist pins' snap rings seated in
place? I'm sure you wouldn't knowingly assemble a
motor if they weren't but now that it's apart it may
be something to check. If they weren't and they caused
a problem you'd probably see cylinder wall damage so
I'm sure that isn't the case..just thinking out loud..

by the way, which rings did you use?

Keep us posted as I'm sure you will. I am interested
in hearing what your problem turns out to be while
crossing my fingers during my current engine build. :)

Ian

--- Mike Murphy <murphymike@hotmail.com> wrote:

> 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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