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Genuine Exhaust Manifolds Improve The Longevity Of The Vehicle
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Fuel by itself is of no use whatsoever: it needs oxygen from the air outside in order to burn. At the most basic level, this happens its own accord: as the piston falls during the induction stroke, air rushes in past the open inlet valve to fill the expanding space. Then, when the compression and power strokes are complete, the exhaust valve opens and the rising piston pushes the exhaust gas out ready for a fresh charge of clean air. In practice, though, the engine needs an air filter to stop dirt, moisture and bits of rubbish being sucked into its cylinders, and needs an exhaust system to dispose of the hot exhaust gases safely and quietly.
To save having a separate filter and exhaust pipe for each cylinder of a multi-cylinder engine the incoming air is fed to the cylinders through tubular structures called inlet manifolds, and the exhaust gases are carried away through similar structures called the exhaust manifolds. One of the popular is the Mercruiser Exhaust Manifolds.
Marine diesels usually operate in a relatively clean environment: there's little danger of them having to contend with straw, dust or roadside litter. This means that their air filters can be relatively simple, so some engines operate perfectly well for years with little more than a metal box with a few baffles in it. Most, however, have something a little more sophisticated, involving either wire gauze or porous paper. Paper tends to restrict the air flow, so to make up for this its area has to be increased by being folded into a concertina shape. It's also difficult to clean, so once a paper filter becomes clogged it has to be replaced with a new one.
When it comes to exhaust systems, the boot is on the other foot: road vehicles and agricultural machinery have an easy time of it. Sometimes even multiple coolers are used for faster cooling of the heated oil. Their engines are in compartments that are open to the atmosphere but sealed away from their drivers and passengers, so all that's required is a pipe connected to the exhaust manifold, with a few baffles to reduce the noise. A few marine installations adopt a similar 'dry' exhaust system, known as Omc Exhaust Manifolds usually in the form of an exhaust pipe sticking straight up from the engine compartment, with a weighted flap to stop rain or spray running down inside and heat resistant lagging to minimize the risk of fire or burns.
The vital thing about any exhaust system that it must not restrict the flow of exhaust gases beyond a certain limit, because if exhaust can't get out of the cylinders, there will be no room for fresh air to get in. The effect is exactly the same as if the air filter were clogged: starved of oxygen, the engine will not be able to burn its fuel, so it will lose power and produce black smoke.
So you should wisely choose exhaust manifolds for better of the combustion from marine vehicles.
Author info: Joan Ruth is associated with Marine Parts House since a long time which is the leading online portal to offer an extensive range of boat motor parts, including Mercruiser exhaust manifolds, OMC exhaust manifolds and many more.
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