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· Trained (ex)Professional, , 1953-2018 RIP
16,230 Posts
The Marelli S166B serves two purposes. One is that under high load conditions, the secondary points come into play to retard the ignition timing a few degrees. This prevents knocking. As a result of this, under low and medium load conditions, the ignition timing is advanced a few degrees which can favorably effect emissions and fuel economy.
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