Higher compression ratio and lower air-fuel ratio tend to raise the required break down voltage. Various types of electrode configurations were examined. It was found that a very thin platinum plate attached to each elect-rode was effective in reducing the electrode wear. This newly developed platinum tipped spark plug uses a small sized center electrode and an enlarged initial spark gap. The lean misfire limit and the torque fluctuation at partial load are improved with the platinum tipped spark plug. After a durability test, the break down voltage became lower due to the grained platinum surface. The spark gap was almost unchanged during an 80 thousand kilometer durability test run.
A New Platinum Tipped Spark Plug Extends the Lean Misfire Limit and Useful Life
Sae Technical Papers
SAE International Congress and Exposition ; 1983
01.02.1983
Aufsatz (Konferenz)
Englisch
A new platinum tipped spark plug extends the lean misfire limit and useful life
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