[Vwdiesel] Altitude compensation

Libbybapa@wmconnect.com Libbybapa at wmconnect.com
Fri Sep 2 22:41:07 EDT 2005

When I checked the compression on my TD vanagon all four were within 5 psi of 
each other.  3 were 400 and the fourth was 395.  I was a little concerned, 
but the engine ran fantastic, so I've continued to drive it.  My friend's 
quantum checked out at 380 on all four.  I recently got thinking about the fact that 
I live at about 7,000 ft.  When the altitude compensation is factored in to 
my friend's engine his compression at sea level is 460 psi.  My TD vanagon 
engine would read 475-480 psi!  Nothing wrong with that!

I was also thinking about the recent discussion of Passats running on low, 
mid or high grade fuel.  Someone mentioned that some people saw no performance 
decrease or mileage decrease with the lower grades, others saw significant 
difference.  I got thinking that probably the cars seeing no change were primarily 
at high altitudes.  I'd love to have that member of the group post that idea 
to the passat group.  It makes me think that I've been wasteing my money 
putting high test in my ABA work van.


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