8-2-stojjkie-k-vysokojj-temperature-svechi-zazhiganiya.html

8.2. Proof to a heat – spark plugs

The problem of spark plugs – to ignite топливовоздушную a mix in the combustion chamber. Thus there are temperatures to 2500°С and pressure of combustion to 60 bar. That sparks confidently came off the ends of candles, "rest" of the central electrode is surrounded by a ceramic insulator. The central electrode together with connecting bolts is besides inserted in current-carrying стекломассу which strongly fixes their case of candles and condenses in front of the combustion chamber. As soon as necessary pressure of ignition and an optimum parametrical corner of ignition is reached, they are discharged in the form of categories from the central electrode to lateral electrodes. Categories possess such energy to ignite a fresh fuel mix in the combustion chamber.

Variable – калильное number

That spark plugs reliably worked, they should reach quickly right after engine start-up the temperature of self-cleaning (approximately 400 °С). If it is not reached, rather in short term on an insulator cone settle the combustion rests. At full loading the temperature on the ends of spark plugs whenever possible should not exceed 800 °С. Otherwise, it is exact, as well as the following stop on autorefuelling, in the engine there will be defects (the burnt through pistons, teases of pistons and so on).

Naturally, working conditions for spark plugs in all engines the different. Only калильное the number defines, whether candles and the power unit will be co-ordinated among themselves. If, for example, you use candles with small калильным number the thermal cone of an insulator strongly heats up. It can lead uncontrollable калильному to ignition that can lead even to engine destruction. On the contrary, if candles with high калильным number they do not reach the demanded temperature of self-cleaning have been chosen – the insulator cone becomes soiled and in due course igniting sparks can to be seen.

Increases automatically – distance between electrodes

Besides correct кадильного candles should have numbers (look the table) also and corresponding distances between electrodes. In new candles it makes, for example, 1,3 millimetres, however in due course it increases: the overlapping high voltage leads to regular removal of metal particles from electrodes. The big distances between electrodes demand and more an ignition high voltage. A consequence: refusal in ignition, the engine can not be started.

Therefore at replacement of spark plugs be necessarily convinced that candles have ordered for yours Mondeo кадильное number, correct distance between electrodes and an appropriate carving.

Original spark plugs for Mondeo