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Old 01-07-2013, 02:33 PM   #11
Chip Stevens
Gnarly Adventurer
 
Joined: Feb 2005
Location: Yucaipa, Ca
Oddometer: 111
Spark plug color is not the best way to determine fuel air ratios. In aviation we determine rich or lean off cylinder head tempature peak. If you google Gami Injectors and spend some time researching you will see that many turbocherged aircraft are running 50 degrees lean of peak where the tempatures are cooler then at peak. All this is irrelevant if you are running less then 75% power. Power is determined by RPM and manifold pressure. Much above 5000 ft a naturally aspirated engine can't get more then about 75%. In other words if you are below 5000ft running full RPM and full throtle for more then two minutes you aren't likely to do any damage rich or lean. chip
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