>it would seem the gap could be anywhere from 90 degrees to >the valve (in line with the crank shaft) to the 180 positions (perpendicular >to the crank shaft) or at 45 dgrees to the intake valve, with the electrode >toward the exhaust valve.
Actually, you should stick with the recommendation of fore and aft. If you orient the gap away from the intake valve, the valve could hit the back of the electrode. It has happened to me on a big valve engine. Keep the electrode in line with the crank shaft as much as possible. >On an Alfa 4 cyl engine, wouldn't the gap opening be in the center no matter >which way the plug faced? Since the plugs come down in the middle of the >combustion chamber. The spark plug is slightly offset from the middle on the Alfa engine. But again, no perceptible difference in performance. Don't worry about gaining anything, just keep them from interfering with the valves. Stefano Concord, CA -- to be removed from alfa, see http://www.digest.net/bin/digest-subs.cgi or email "unsubscribe alfa" to [email protected]
