[Shotimes] Re: help.....valve chatter and rod knock...

[David P]

You've thought wrong, then. A 7,000 rpm redline has not been exclusive to
the SHO. Even my motorcycles have had zero rod bearing issues. Low rpm
diesel Cummins motors are a hell of a lot harder on their rod bearings than
our SHO's will ever be. The rod bearings are too small for a 7k rpm, 220hp,
3400lb car. They decided to sacrifice durability for rotating mass,
obviously, and came up on the short end of the durability stick. If these
were race cars, I wouldn't care, but they are not. 60k mile failure of rod
bearings is simply not acceptable for a street automobile, PERIOD. Not one,
not two, ZERO. We are not talking defect failures here. The failures have
been because the rod bearings were past their life cycle. This is not
acceptable just because the car has a 7k redline.


David P

95MTX



~
----- Original Message -----
From: "Ron Porter" <ronporter@prodigy.net>
To: "David P" <jpotter8@bellsouth.net>; <shotimes@autox.team.net>
Sent: Sunday, October 27, 2002 12:22
Subject: RE: [Shotimes] Re: help.....valve chatter and rod knock...


> Are these cars that have a 7,000 rpm redline??? I think not.
>
> Ron Porter
>
> -----Original Message-----
> From: shotimes-admin@autox.team.net
> [mailto:shotimes-admin@autox.team.net]On Behalf Of David P
> Sent: Sunday, October 27, 2002 12:21 PM
> To: Ron Porter; shotimes@autox.team.net
> Subject: Re: [Shotimes] Re: help.....valve chatter and rod knock...
>
>
> I am used to driving cars that have NO rod bearing failures, and a much
> higher production run, so I still think something is amiss.
>
>
>
> David P
>
> 95MTX
>
>
>
> ~
> ----- Original Message -----
> From: "Ron Porter" <ronporter@prodigy.net>
> To: <shotimes@autox.team.net>
> Sent: Sunday, October 27, 2002 10:52
> Subject: RE: [Shotimes] Re: help.....valve chatter and rod knock...
>
>
> > I disagree, there are NOT that many rod bearing failures. There are many
> > cars running around with 200K+ miles on original bearings. FWIW, if
> bearings
> > wear out over 200K, that sounds like normal maintenance to me......
> >
> > If someone buys a used SHO with a questionable service history, and it
has
> > 75K+ miles, I would change the rod bearings. Otherwise, for
original-owner
> > cars, or well-maintained cars, I wouldn't worry about it.
> >
> > Ron Porter
> >
> > -----Original Message-----
> > From: shotimes-admin@autox.team.net
> > [mailto:shotimes-admin@autox.team.net]On Behalf Of David P
> > Sent: Sunday, October 27, 2002 9:51 AM
> > To: Erik Balser; shotimes@autox.team.net
> > Subject: Re: [Shotimes] Re: help.....valve chatter and rod knock...
> >
> >
> >     Rod bearing replacement should become part of the 60k service, or at
> > least by 100k. Main bearings should be done every other 60k, or 150k at
> the
> > most. Some motors may not need the bearings, but the motor needs the oil
> > pressure to maintain other things, like the valvetrain. I replaced my
rods
> > and mains at 70k and gained 3-11psi depending on the rpm.
> >
> >     All this talk of rod bearing failures (through the years) has me
> > wondering why there are so many. What I am questioning is whether or not
> the
> > journal places enough pressure on the bearings to keep them seated to a
> low
> > enough psi to be considered reliable. Maybe for Yamaha's engineers. Most
> of
> > the stuff Yamaha builds is high maintenance, low duty (racing motors,
> > motorcycles, boats, etc...).
> >
> >
> >
> > David P
> >
> > 95MTX
> > _______________________________________________
> > Shotimes mailing list
> > Shotimes@autox.team.net
> > http://www.team.net/mailman/listinfo/shotimes
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