[TPR] Grooved Bearings

[steve at donegan.org]

I would imagine there are a lot of factors here - ie what bearing clearance are you going to run, what oil pressure, what kind/viscosity of oil etc... My gut instinct is if no bearing company makes full grooved ones there is likely a good reason...
____________
Steven Donegan
SSCC/NORC Car #86
www.sscc.us



--- On Sat, 1/29/11, David in Durango <adin at frontier.net> wrote:

> From: David in Durango <adin at frontier.net>
> Subject: Re: [TPR] Grooved Bearings
> To: tpr at teampanteraracing.com, "Asa Jay Laughton" <asajay at asajay.com>
> Cc: "Daniel C Jones" <daniel.c.jones2 at gmail.com>
> Date: Saturday, January 29, 2011, 8:19 PM
> All,
> as I remember, grooved bearings were to supply oil to the
> journal (as 
> stated).  I suppose some argument could be made for
> loss of bearing surface?
> 
> Not sure what current thinking is - would love to hear what
> Dan has to say 
> and/or Russ (is he on the list?)
> 
> thanks for any input!
> 
> David in Durango
> 
> ----- Original Message ----- 
> From: "Asa Jay Laughton" <asajay at asajay.com>
> To: <tpr at teampanteraracing.com>
> Sent: Saturday, January 29, 2011 1:08 PM
> Subject: [TPR] Grooved Bearings
> 
> 
> > Hey all,
> >
> > An interesting question came up from one of our guys
> privately and I
> > thought I'd share.
> >
> > It centers around the idea of having fully grooved
> bearing sets for the
> > crankshaft.  The theory is if you have a grooved
> upper and lower
> > bearing, then the rod can get lubrication during a
> full rotation rather
> > than a half.  Oil has to feed from the block into
> the main bearing area
> > of the crank, which then feeds oil to the rod bearing
> journals.
> >
> > So, I'm aiming mostly for Russ Fulp here, who we know
> has built a killer
> > engine for Mad Dawg but anyone who has been building
> engines should be
> > able to chime in here.  What are the opinions of
> using a grooved main
> > bearing for both upper and lower halves of the main
> journals?  What
> > about the rod journals?
> >
> > The question comes up as there doesn't appear to be a
> bearing house that
> > will source a full set with both halves grooved
> (though apparently one
> > source used to but no longer does).
> >
> > Looking forward to the feedback,
> > Asa Jay
> >
> > -- 
> > Asa Jay Laughton, MSgt, USAFR, Retired
> > &  Shelley Marie
> > Spokane, WA
> > ******************************
> > http://www.racingagainstautism.com
> > http://www.teampanteraracing.com
> >
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