On the top of each cylinder of the four cycle automotive engine ( on the cover of the hollow tin example in the preceding posts of the Nepon Auto Blog blog ( People before profit – welcome to the North End). are two valve ports or openings. Sealing these openings are the valves themselves. The valves move on a gear-driven valve assembly – involving among other things – timing chains, cam shaft , distributor gears. pushrods and rocker arms so that each arm may be open or closed depending on the stroke of the four cylinder auto engine. One valve is called the exhaust valve because its doorway connects to the exhaust manifold, muffler and tailpipe. The other is called the intake engine valve, as its doorway connects to the intake manifold , fuel intake fuel injection assembly unit and lastly the auto engine air cleaner.
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