FIELD: engine manufacture. SUBSTANCE: ceramic heater of spark plug possesses high resistance due to reduction of its cross-sectional area at reduced-section portion; mentioned portion is located on side wall of ceramic heater at point on which fuel-air mixture falls; it is spaced through certain distance from heater; cross-sectional area of the latter is reduced due to reduced thickness of this side wall. EFFECT: reduced power loss, enhanced mechanical strength and heating speed of spark plug. 3 cl, 5 dwg
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