[Shotimes] Low pressure, high volume?

[Donald Mallinson]

Lots of questions, here is some of the info:
the top end spins at half speed and doesn't get the 
hammering that the rod and mains get from "lugging".

The bearins are not bad in any way in the SHO, they don't 
have a habit of spinning unless super high miles or they get 
abused.  Failures of this sort are rare in any car and the 
SHO is no exception, other than it gets driven harder than 
your typical sedan.

Bearings are made of several layers of metal, There is 
copper, aluminum, and some others.  The material is designed 
to eventually wear away, being softer by far than the crank. 
  Easier and cheaper to replace bearings than re-do/replace 
the crank.

Replacements are not made any different.

LUgging the engine is done at 600-1000 rpm, and you have the 
combustion explosions putting huge forces on the crank, rods 
and bearings.  Cranking by hand is at about 100 or 200 rpm? 
   and as soon as the engine starts it rev's higher than 
1000, plus the engine is not trying to pull the car at big 
throttle openings like in lugging.

The pump is designed to do the job intended.  Some 
aftermarket applications for other cars offer some 
"improved" pumps, but there really isn't anything wrong with 
the SHO oil pump.

Don Mallinson

Bobbonnit1@aol.com wrote:
> I can't for the life of me, figure how rod bearings  would not get enough 
> lubrication for the short period of time that one would  "lug the engine". You 
> would think that the upper end would run dry and you'll  ruin a cam before 
> making a rod bearing spin. Before it spun, it would have to  run completely dry 
> until friction grabbed it and pulled the little tab that  holds it in place 
> completely flush!  What are OEM bearings made of  anyways?  Is being made of too 
> soft of an alloy cause premature failure in  early SHO's?  Are replacements made 
> of a harder metal? What's the  difference (as far as rod bearings go) in 
> lugging the engine or turning over by  hand during assembly?  Why don't they make 
> a high volume, high pressure  pump.......too much lube is a good thing right?  
> Let's hear it from all you  ShoSters!
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