Oil Pressure

[<hofs@domain.elided>]

>From: zee <zee@domain.elided>
>Subject: re engine oil
>
>The persons that reccomended the different oils to me were (when it
>comes to Scouts) people we would all listen to.  The reason I want to
>change oil is because at a prolonged 2800 revs the oil pressure will
>drop from 40 to 20 pounds very rapidly, then when I back off to 2700
>revs it climbs back up to 40lbs. It happens too quickly for heat. It
>seems like oil starvation.
>
>
>
>Bryan 
Bryan,
That doesn't sound anything like a problem that would be solved by 
changing oil brands or viscocity. First of all, I'd check the gauge by 
using a non electric oil pressure gauge installed temporarily to see if 
you get the same results. If the results are the same, I'd check the oil 
pressure cutoff device (pressure limiter), which off hand, I don't recall 
the location of on a Scout, but could look up for you in my shop manual. 
I visualize the spring on that device as getting bound up and not 
returning to apply pressure to the ball as the oil heats up and loses 
viscosity. Then when you drop the rpms the pressure drops some more and 
allows the spring to unbind. (wish I hadn't started this visualization)  
Anyway, it doesn't have anything to do with the kind of oil you're using.
John

John Hofstetter
Life Member, National Rifle Association
Member, California Rifle and Pistol Association
Member, Sierra Macintosh Users Group  Member, MacTwain Macintosh Users 
Group
Charter Member, FRIENDS OF DEATH VALLEY   Member, Blue Ribbon Coalition
Life Member, Association of California School Administrators
Owner of 79 Scout Terra "It's a legend"