![]() Overlap is what creates that desirable lumpy idle for street engines. ![]() Overlap is defined as the amount of time (in crankshaft degrees) that both the intake and exhaust valves are open simultaneously. However, it isn’t a magic cure-all and you need to understand how the sensor works to truly get the most benefit out of one. Adding an oxygen sensor to the exhaust is a great tuning aid if it is used properly.
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