In addition to preventing oil leaks, the spark plug O-ring also helps to maintain the proper air-fuel mixture inside the combustion chamber. If this mixture is disrupted, it can result in poor engine performance and reduced fuel efficiency. By keeping the seal tight, the O-ring ensures that the spark plug is able to ignite the air-fuel mixture at the right time, allowing the engine to run smoothly and efficiently. The Revolutionary Impact of Spark Plugs on Modern Vehicles When it comes to spark plugs, the a7tc spark plug stands out as a popular choice among motorbike enthusiasts. Designed for use in small engines like those found in motorcycles, ATVs, and scooters, the a7tc spark plug offers reliable performance and long-lasting durability.
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Standard 3760/3761
Vulcanizates of several fluoroelastomers, listed in Table 14.1, were exposed to a standard 5W-30 engine oil, ASTM Service Fluid 105, for up to 6 weeks at 150°C (302°F).5 The oil was changed weekly, but was not aerated. Retained elongation was measured after exposure for 1, 2, 3, and 6 weeks; data are shown in Fig. 14.3. The results indicate that bisphenol-cured FKM-A500 VDF/HFP copolymer, FKM-B600 VDF/HFP/TFE terpolymer, and peroxide-cured FEPM-7456 TFE/P/VDF terpolymer lost most of their original elongation over the course of the test exposure, indicating considerable additional cross-linking occurred by reaction with amine- and phenol-containing oil additives. The other fluoroelastomers showed better retention of elongation, being much less susceptible to additional crosslinking. Note that FEPM-7456 contains a high level of VDF (about 30%), while FEPM-7506 contains a relatively low VDF level (10–15%) to serve as cure site for bisphenol curing. The other FEPM types contain no VDF.