The Swirl-Chamber Spark Plug: A Means of Faster, More Uniform Energy Conversion in the Spark-Ignition Engine 840455

Recent findings indicate that the energy-conversion process must take place faster and more uniformly in order to achieve a further reduction of fuel consumption and exhaust emissions from present-day engines. A swirl-chamber spark plug developed by Bosch can contribute toward reaching these goals.
The spark plug has a small chamber with 5 orifices (1 central, 4 tangential). On the compression stroke the 4 tangential orifices generate a marked swirl in the chamber. The ignition spark jumps from a small lateral pin on the customary center electrode across to the cylindrical wall of the swirl chamber. As a result of the swirl, a very rapid combustion takes place in the chamber and generates 5 torch jets which insure rapid and uniform energy conversion in the main combustion chamber.
Tests on engines indicate considerably smoother engine running than with customary spark plugs. At the lower end of the part-load range and during warm up, thermal efficiency is improved.


Subscribers can view annotate, and download all of SAE's content. Learn More »


Members save up to 43% off list price.
Login to see discount.
Special Offer: With TechSelect, you decide what SAE Technical Papers you need, when you need them, and how much you want to pay.