Pinging

["John Hofstetter" <hofs@domain.elided>]

David,
Yes, advancing the timing will affect the pinging. It will make it
much worse. Pre-ignition or pinging is more of a problem at low
elevations than at higher elevations. The higher octane will help. I
use nothing but premium in my 345, and still can get some ping. My MSD
adjustable timing device in my Terra lets me run at 0 degrees at sea
level and at somewhere between 6 and 10 degrees advanced timing at my
home altitude of 2200 feet.
John H.
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From: owner-ihc-digest@domain.elided (ihc-digest)
To: ihc-digest@domain.elided
Subject: ihc-digest V6 #826
Date: Tue, May 11, 1999, 4:12 PM


From: David_Luebke@domain.elided
Subject: Towing/higher octane and dwell

       >Having said that, try running the timing at say 8-10 BTDC
       instead of 0
       like the factory says (for late model smogged Scouts). It makes
       an amazing
       difference in mine.
       >

       Will higher octane and the above adjustment help the pinging
       with a 345/thermo quad, under heavy tow loads.  In 4 wheel
       drive I had pinging occuring  at 50 -55 mph , could not keep
       speed up on hills e.g. 60.    This was done at sea level with a
       3000# load,  It also took a long time to get up to 55.   Any
       suggestions?  Did not have the smog pump hooked up.