<VV> Low oil pressure switches

[Sethracer at aol.com]

Bob's suggestion will appeal to those who are not paranoid! For those of us 
 who are <grin>, you can buy a single pole replacement switch that comes on 
 at 20 psi. Look for a "Longacre P/N 4308". I have that switch in my  
racecar (the only really good application) and saw it light up several  times at 
the Kalamazoo convention autocross. For racing applications, the  "often" 
2-3 PSI switches are also known as "engine destruct indicators".  They come on 
to tell you why your engine just blew up. - Seth  Emerson  
 
 
In a message dated 8/5/2013 12:27:15 P.M. Pacific Daylight Time,  
BobHelt at aol.com writes:

Bryan,
You should know is that you likely have the WRONG  sender  switch 
installed. 
GM had several types in use that all looked  alike but  activated at 
different pressures. So the easiest and  simplest thing to do first  is get 
a switch 
that is intended for  Corvairs. The Corvair spec is....close  when the 
pressure drops below  4 to 6 psi. That should cure your light  coming on. 
Next, 30 
psi  isn't THAT low for higher rpms. Just live with it and  forget working  
on the pressure relief spring. All of course in my humble   opinion.
Regards,
Bob Helt


In a message dated 8/5/2013  8:33:06 A.M. US Mountain Standard Time,  
bryan at skiblack.com  writes:

Hi  folks,

I figure I'll give Matt something to  think about :-)

I  have a 110 of unknown history in the '66 that I  switched from 15x-50 to 
 
10w-30.  When it's hot I now get an oil  light at idle.  I thought  about 
changing it back, but it seemed  to make sense to actually check the  
pressure 
and see what it  is.  So I made an adapter out of an old oil  filter bolt 
and 
put  a small mechanical press gauge on it.

At start up I  have 25 psi  at idle, but it only gets to 30 even at 3500 
rpm.  When warm   it's hovering around 8 - 10 at idle, but bringing the 
engine 
up to 3500 I  only  get about 20 psi.  I'm thinking the easy thing to try  
first is just swap  out the pressure relief spring.  Any other  quick 
fixes?  I'd 
prefer  to run 10w-30, but if it comes to it  I'll put the heavier oil in 
it, I'm not  going to go deep into this  engine any time soon and it runs 
really well   otherwise.

--Bryan

Bryan Blackwell | Springfield, Va. |   bryan at skiblack.com | 
http://autoxer.skiblack.com/   
Corvairs:  '62 700 Wagon, '64 Greenbrier, '65 Corsa, '66 Corsa
'69  Road Runner,  '99 Neon R/T, '00 Miata SE, '09 Ford F-150
"Why do  something if you're not  going to obsess about   it?"



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