Denso ESR-U Resistor U-Groove Spark Plug

DENSO's patented U-Groove spark plug enables complete combustion by allowing the spark to fill the gap created by the U shape. The ball of fire created in the U-Groove develops a larger and hotter flash front that virtually eliminates excessive fouling and erratic starts caused by poor fuel mixtures.

Even DENSO's "standard" spark plug is something special. The innovative design that helped to make DENSO spark plugs famous, the U-groove plug employs a unique, channeled ground electrode designed to generate a larger spark nucleus at the point of ignition. Greater spark energy than ordinary plugs means improved flame travel, producing more complete, consistent, and efficient combustion.

Vehicle Fitments:

Year	Make	Model	Submodel
1970 - 1972	Honda	600	Base
1967 - 1987	Porsche	911	Base
1974 - 1989	Porsche	911	Carrera
1989	Porsche	911	Carrera 4, Speedster
1967 - 1977	Porsche	911	S
1976 - 1989	Porsche	911	Turbo Carrera
1978 - 1979	Porsche	930	Turbo
1976 - 1977	Renault	R17	Gordini
1977	Renault	R17	GTL
1976	Renault	R17	TL