I see you have it backwards again! A lean condition is what causes detonation. Always start out rich to protect an engine. More boost leans the mixture so you have to add more fuel as the boost increases. In the old Cummins engines the fuel was increased with an Android valve as the boost increased. Of course with a diesel engine they never detonate, they just get better economy when they run lean. In modern gas engines the fuel mixture is set rich like maybe 12 to one, then the oxygen sensor leans out the mixture so even if the oxygen sensor fails the engine will just run a little rich and won't be destroyed. Those big engines might need to be backed off to 5 degrees or even 0 degrees at start up. On my Toyota pickup, the timing is set at 0 degrees. First time I have seen that but that's what the book says.
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Today's Featured Article - Engine Basics: Spark Plug Cleaning - by Staff. Cleaning procedures: Brush or blow dirt from around the spark plug base. Remove the plug with a correctly fitted wrench. Examine the porcelain insulator and points. If the insulator appears to be melted or blistered, cracked or broken, and the points seem unduly burned it is evident that the plug is operating too hot and it should be replaced with a colder plug. If the plug is fouled excessively with carbon it apparently is operating too cold and it should be replac
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