FIELD: engines and pumps.
SUBSTANCE: central and side ground strap have flat ends to make sharp edges while side strap ledge surface facing the central electrode cylindrical surface has a recess inclined at sharp angle to central electrode axis. Said central and side ground strap have flat ends to make sharp edges located in one plane crossing the central electrode flat end, perpendicular to its axis. Surface of central electrode flat end ledge has recess facing its cylindrical surface and formed by cone surface, its axis being aligned with central electrode axis. This results in that plug cross-section has spark gap profile shape confined by two concentric circles.
EFFECT: higher reliability and completeness of fuel combustion, longer life, decreased amount of emissions.
4 cl, 5 dwg
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