besigilinant į žvakių veikimą, man rodos atradau priežastį, kodėl esant `palankiom` aplinkybėm reikalingas `redline`, kad mašinėlė atsigautu:
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http://www.ngksparkplugs.com/tech_support/spark_plugs/p2.asp?mode=nmlPre-delivery fouling
Carbon fouling occurs when the spark plug firing end does not reach the self-cleaning temperature of approximately 450°C (842°F). Carbon deposits will begin to burn off from the insulator nose when the self-cleaning temperature is reached. When the heat range is too cold for the engine speed, the firing end temperature will stay below 450°C and carbon deposits will accumulate on the insulator nose. This is called carbon fouling. When enough carbon accumulates, the spark will travel the path of least resistance over the insulator nose to the metal shell instead of jumping across the gap. This usually results in a misfire and further fouling.
If the selected spark plug heat range is too cold, the spark plug may begin to foul when the engine speed is low or when operating in cold conditions with rich air-fuel mixtures. In some cases, the insulator nose can usually be cleaned by operating the engine at higher speeds in order to reach the self-cleaning temperature. If the spark plug has completely fouled, and the engine will not operate correctly, the spark plug may need to be cleaned / replaced and the fouling cause identified.
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esmė ta, kad nebūtinai bloga žvakė gali būt parinkta, bet jei su ja nemažai atvažinėta, o dar riebesnio mišinio gauna ar tepalo ar ko ten užsineša, gaunas silpnesnė kibirkštis, (ko pasekoje mažesnis sprogimas?), ir važinėjant nedidelėm apsukom, šaltu oru, trumpais atstumais, žvakės prašyte prašosi keičiamos į naujas arba kokso, tam kad įvyktu apsivalymas (reik pakelti temperatūrą degimo kameroje).
ar aš teisus?
