<VV> STP and the Scerwdriver

[Ron]

Sounds logical to me.
RonH

----- Original Message ----- 
From: "Smitty" <vairologist at cox.net>
To: <virtualvairs at corvair.org>
Sent: Wednesday, January 04, 2012 9:00 PM
Subject: <VV> STP and the Scerwdriver


> Smitty Says;  I am not an oil engineer and because of the years since I 
> was
> in the school I am not even sure of the terminology.  Nor am I sure of the
> application.  But here goes.  When I worked for Philips 66 we who were 
> even
> remotely involved in sales had to go to schools on the properties of oils 
> so
> we could sound half smart when talking to customers.  There is a thing
> called dynamic barrier when oil is pumped between flat bearings and
> crankshafts.  It keeps the metals separated when pressure is applied to
> press them together.  If oil too light in viscosity is used the oil will
> extrude out from between the metals and galling will occur.  If oil too
> heavy in viscosity is used the dynamic barrier will rip or pull apart and
> again you will have metal to metal contact.  There is actually a big wide
> range of viscosity that can be satisfactory but naturally the engineers 
> will
> specify a median viscosity to provide protection under high and low heat
> operating conditions.
> STP is a viscosity improver and in it's unmixed state is very thick and
> slick feeling.  Slick, not necessarily because it is such a superior oil ,
> but because at low speeds of relative motion its thickness of barrier
> provides contact prevention between two components.  It might make a heck 
> of
> a lubricant in a differential but in an engine at 7,000 rpm bearing life
> would be very marginal.  The point being that there is a lubricant for 
> every
> application and there is often a fine line between what you can and can 
> not
> get away with.
> Which brings us back to screwdrivers.  When you wet a screwdriver bit with
> STP and then try to hold on to it, chances are you will use the same 
> fingers
> you tried with the conventional oil.  Chances are you will be holding on
> (pinching) just about the same tightness.  The regular oil with a 
> viscosity
> of probably 10 to 40 extruded out from under your fingers and allowed skin
> and fingerprint contact with the screwdriver.  What's the viscosity of 
> STP?
> 100- 120-150?  I don't know but it is going to take a lot longer to 
> squeeze
> it out for the same skin and fingerprint contact you had with the oil.
> Chances are your fingers will get tired and your grip will weaken before
> that happens.  In any event, the holding up a screwdriver with STP in your
> fingers proves absolutely nothing.
> So maybe I am all wet about all this.  I just hate snake oil salesmen
>
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