Posted by chris case on Monday, August 16, 2004 at 9:31PM :
In Reply to: Keith, you got me... posted by wally on Monday, August 16, 2004 at 8:11PM :
Just a few degrees. It helps make high end horse power, but costs low end.
Cross-firing is another thing all together. Only happens when 2 adjacent cyls fire consecutively, like in 289 & 302 fords. The 2 plug wires running next to eachother induce voltage in each other and fire 45 degrees advanced (#7 fires #8 at same time).The Hi Performance versions changed the firing order. If you have one of the low-po engines, cross the suspect plugwires 3 times, it seems to prevent the crossfire.
Newer Ford 4 cyls use 2 coils, each fire 2 cyls at the same time- one is at TDC, the other is at BDC and doesn't ignite anything. Maybe this is called cross-over?
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