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http://www.pntec.de :: Thema anzeigen - To help you understand what is Valve seat
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zjautoparts
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Dabei seit: Jan 26, 2016
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BeitragVerfasst am: Mi Jan 27, 2016 8:09 am    Titel: Kein Icon To help you understand what is Valve seat Antworten mit Zitat

The Valve seat    is probably the most misunderstood mechanical part on a motorcycle and many small engine machines. All engines require a proper mixture of air and fuel for combustion; the strange device known as the carburetor controls the ratio of the fuel/air mixture entering the engine. This sounds simple enough, but there are many carburetor parts that, if not set properly, will at best cause the bike to run badly, or at worst keep it from running at all. The correct ratio of fuel and air is crucial for engine performance.

If there is an icon in the performance world, it has to be the Holley four-barrel carburetor. The beauty of the Holley is that from a plain-Jane 600-cfm to a 1,050-cfm Dominator, all Holley carburetors work the same way. Better yet, its modular design makes the Holley exceptionally easy to work on. Basically, if you can fog a mirror, you can rebuild a Holley. Given that, we’ve assembled a step-by-step rebuild tour through a typical Holley vacuum-secondary four-barrel carburetor. So grab your wrenches and screwdrivers and let’s get started. Oh, don’t forget the fender covers.

Here are a few words and some pictures I put together to help eliminate the confusion in setting your float level. Obtaining the correct float level is of the utmost importance as it can affect all jetting circuits. THE FLOAT LEVEL IS THE FIRST STEP TO PROPERLY DIALING IN YOUR JETTING.

To help you understand what is going on inside your float bowl I’ll first explain the theory behind it. Contrary to popular belief engine intake vacuum alone is not strong enough to ingest the required amount of fuel needed for proper running, much less running at all. All engines require some sort of pressure to force fuel into the intake tract where it can mix with a metered volume of air prior to combustion.

This pressure is obtained by the use of a venturi and the mechanics described by the Bernoulli Effect. The venturi is used to speed the airflow of the incoming intake charge which also happens to decrease the pressure present in the venturi. The pressure differential between the venturi and the float bowl has a natural tendency to try equalize, and it’s this pressure differential that is responsible for creating the ‘fuel pressure’ that is required for proper running.

The fuel system on most off-road and MX bikes makes use of a carburetor that is of the gravity feed variety. As it suggests you’re relying on the forces of gravity to pull fuel from the gas tank down to the carb and into the float bowl. Since your float bowl is vented, atmospheric pressure (14.7psi) is constantly acting on the predetermined volume, or weight, of fuel inside your float bowl.

As air flows through the carb bore (venturi) a pressure drop is realized and the fuel in float bowl is ‘pressurized’ as the pressure between the float bowl and the carb bore (venturi) try to equalize. By altering the volume, or weight of fuel in the float bowl you’re basically varying the fuel pressure that is acting on your jets. More fuel in the float bowl will create more fuel pressure and result in rich(er) running conditions for a given set of jets.

To get more and detailed information regarding any type of Carburetor needle valve and Carburetor seat valve, visit our website zjautoparts.net. All types of Carburetor seat valve   information are available on the website regarding different series of the carburetors, how to identify them and troubleshoot them.
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