ApplicationNo. 397372 filed on 09/14/1973
US Classes:219/205, Motor or engine123/142.5E, Electric heaters for heating cooling system123/549, Electric heater184/104.2, For internal-combustion engine219/523Housing, casing, or support insertable into material or space to be heated (e.g., immersion type)
ExaminersPrimary: Bartis, A.
AbstractAn aircooled aircraft engine is preheated prior to starting by the insertion of electric heating devices into the blind holes, normally provided for the reception of thermocouples, in the metal castings of the cylinder heads immediately adjacent to the spark plugs. The heating devices are of such size and shape that the heating devices are entirely confined in the metal wall of the cylinder casting so that when energized substantially all the heat is transferred to the castings immediately adjacent the spark plug. The heating devices are energized for a sufficient time prior to starting to generate enough heat to prevent frosting of the spark plug, prevent condensation and improve vaporization of fuel when starting the engine. Additional electric heating devices may be inserted into drain hole of the oil sump and/or the oil suction screen in the sump for simultaneous energization with the heating devices in the cylinder heads whereby heat is supplied to the engine oil to facilitate proper lubrication of the cylinders when starting the engine.