Glow Plugs - Bosch New Zealand

Compression Ignition Engine Design FeaturesCompression Ignition Engine Design Features | A 51132122433Swirl chamber engine1 Nozzle-holder assembly with nozzle2 Glow plug3 Swirl chamberPrechamber engine1 Nozzle-holder assembly with nozzle2 Glow plug3 Prechamber4 Combustion chamberDirect-injection engine1 Nozzle-holder assembly with nozzle2 Glow plug3 Combustion chamberDiesel compression ignition engineThe injected fuel is automatically ignited by the air whichis compressed and heated during the compression stroke.Diesel engines do not always rev up as expected at lowoutdoor temperatures. Increased friction as well asleakage and heat losses during the air compression reducethe compression pressure and combustion chambertemperature. Start-up is no longer possible without anadditional energy supply from the glow plugs.The glow plug as energy supplierThe glow element of the glow plug projects into the glowchamber or the prechamber. Placed directly at the edge ofthe mixture swirl, it produces heat exactly where it isrequired. Glow plugs are preheated to more than 850ºCfor cold starting. In modern diesel engines, the glow plugscontinue to glow for several minutes after start-up. Thisresults in a significant reduction in emissions and smoothrunning of the engine immediately after starting.The starting temperature required is also governed bythe design of the engineDirect-injection engines with a single-piece combustionchamber have a lower heat loss and therefore a betterstarting response than prechamber engines or swirlchamber engines with a split combustion chamber.2010 Bosch Automotive Aftermarket