All the advantages of an expensive purchase are only in the future: the long mileage promised by advertising, some percentage of daily fuel economy, ease of starting …
Does it make sense to use "long-lasting" candles if you can buy ordinary ones?
All the advantages of an expensive purchase are only in the future: the long mileage promised by advertising, some percentage of daily fuel economy, ease of starting … In addition, there is no need for frequent replacement: on a modern engine, this procedure is laborious and expensive.
We decided to evaluate two polar designs of one reputable company in order to compare not the technology of different manufacturers, but the very idea embodied in metal, all other things being equal. The choice fell on Denso. The Iridium IW20s are the clear leaders in miniaturizing the center electrode: just 0.4 mm. It is the thin electrode that contributes to better self-cleaning and, accordingly, prolongation of the service life. They were accompanied by the usual W20 EPRs. The original cost difference is approximately fivefold.
The behavior of both types of plugs under the same conditions was monitored for 360 hours. Taking into account the rolling modes, this is equivalent to almost 35 thousand km of run in specially prepared motors - with increased clearances in the cylinder-piston group. This made it possible to carry out accelerated life tests with increased oil consumption and accumulated deposits in the combustion chamber.
Conventional spark plugs slowly but surely worsen engine performance as they age. Measurements taken after 180 operating hours showed a 4% increase in fuel consumption and an increase in exhaust gas toxicity.
Iridium candles showed the first signs of aging only on the approach to the 300th hour of testing. And at the end of the cycle, that is, after 360 operating hours, the deterioration in average fuel consumption was only 3.0%. The CO and CH toxicity increased a little more - by 10 … 15%, which is also not so scary.