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RE: [T3] '69 rear support bushings...

Ahh,, another gauge junkie, welcome and AMEN!  :-)
Ive Noticed that over the last 100K miles my oil pressure started around
38psi at its hottest on the highway at 70MPH in the summer, it went down to
34 over the next few thousand miles and stayed that way for a long time,
then at around 60-70K it started down from there, slowly, to about 26PSI
where it was before the trip cross country and roughly 24 now (at 109K) that
its back
Should things really start down it will let me know instead of being hung
somewhere with a #4 rod gone.
As you say, its not so much the numbers themselves, but the relative numbers
to what is normal for your engine.


Also, in reference to the gauge comments in the last T-3 letters...I have 
run a plethora of these on many aircooleds over the years and their accuracy

while dependent on the the installer and the manufacturer can certainly 
vary, it is  important to remember that while temperatures and pressures may

well be off by some points from a scientific standard, they nonetheless can 
help establish a benchmark for normalcy; a range of what is to be expected 
at various periods of weather, altitude, seasons and speeds, so that 
extremes can be signs to warrant closer investigation.  While sounds are 
invaluable to the driver, they don't tell the whole story.
I had a recent experience with this... ending in this rebuild.  The engine 
"sounded" great and pulled well and a variety of speeds.  But, without 
gauges, I'd have been hard pressed to know that my oil pressure (the norms I

had determined from years of watching the dials), were in precipitous, 
albeit gradual, decline.  Ultimately, the number four bearing dissolved on a

hard climb and the sounds very certainly changed.   But, had I really 
investigated what the gauges had told me for some months, I would have saved

a stroker crank and case, not to mention the time and expense for the 
rebuild.  Gauges work, but only as well as they are installed and tracked, 
indeed, believed.   I won't make the same mistake again.   I will believe 
what I see and not assume that even with 80K , heh, I rebuilt this, taken 
close care of it it "should" get another 20K at least...yeah, or not.
Frank Meek

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