[Vwdiesel] Altitude compensation

[LBaird119@aol.com]

  My work van has 11:1 domed pistons with the "big" (small block) heads.  
I run regular (87 octane) at about 10BTDC.  I've run as high as 14BTDC and 
now need to check it as it's rattling since the gas has changed smell a few 
months back.  Either the points block has worn and advanced the timing 
or the fuel's taken a step down on real world octane ratings.  
  Years ago I put together two different 10.25:1 327s.  One .040 over and 
both ran fine on 87.  Acidentally put together a Honda 1200 with probably 
somewhere around 12:1.  Never even pinged but blew the ring lands out of 
two of the pistons!
   Hagar, I'd wait until the tank's nearly empty and put in 4 or 5 gallons, 
try 
it and see.  If it does fine, then fine.  If not, fill up with premium and 
tada!
     Loren