Carburetor deposits

Hall, D.W. and L.M. Gibbs (1976), Carburetor deposits are clean throttle bodies enough . SAE paper No. 76-0752, Automobile Engineering Meeting, Dearborn, Ml. 

Plugging due to ice, although causing power loss oj even m or seizing, was reversible however the development of recycled crankcase gas resulted in iri ii sibfe solid organic deposits on the walls of the system, especially in the carburetor. 

Detergents/deposit control additives Help prevent deposit buildup on fuel system parts such as carburetors, fuel injectors, intake valves, valve seats, and valve guides some additives will remove existing deposits... 

Gums which form in aviation gasoline could produce undesirable deposits on induction manifolds, carburetors, valves, injectors, etc. Strict limitations exist for the gum content of aviation gasoline. 

In gasoline engines, most detergents will prevent deposit formation on carburetors, fuel injectors, and intake valves. Some detergents also possess the ability to remove existing deposits from intake valves and control the formation of deposits within the combustion chamber of an engine. See FIGURE 6-14. 

Fuel olefins have been implicated as the primary cause of deposits in gasoline fuel injectors and carburetors. High-boiling-point, high-molecular-weight aromatic components have also been shown to contribute to intake system deposit and gum formation. Once formed, other compounds in the fuel can adhere to these deposits to form an amorphous-type deposit. 

These products have been marketed for many years. They are effective at preventing deposit formation and corrosion of carburetors and fuel injectors, but often do not prevent deposit formation on intake valves. Most products contain an amine-based detergent, demulsifier, and sometimes an antioxidant and metal deactivator. The effective treat rate for preventing deposit formation on carburetors and fuel injectors can range from a minimum of 20 ppm to a maximum of about 75 ppm. 

With the introduction of fuel injected vehicles during the mid-1980s, it was found that some carburetor/fuel injector detergents actually contributed to the formation of deposits on intake valves, especially when used at high concentrations. For this reason, it became necessary to determine whether fuel detergents contributed to IVD problems or helped to prevent IVD deposits. 

Prevents and removes deposits on fuel injectors and carburetors... 

Other additives to gasoline often include detergents to reduce the buildup of engine deposits, anti-icing agents to prevent stalling caused by carburetor icing, and antioxidants (oxidation inhibitors) used to reduce gum formation. 

Carburetor/Injector Detergents—prevent and remove deposits in carburetors and port fuel injectors... 

Deposit Control Additives—remove and prevent deposits throughout fuel injectors, carburetors, intake ports and valves, and intake manifold... 

Is absorbed by cork carburetor, thus rendering them valueless. Loosens gummy or other materials deposited in fuel system and thereby clogs screens in the fuel lines. 

Minimize oxidation and gum formation during storage Deactivate trace metals that can accelerate oxidation Minimize rust throughout the gasoline supply chain Minimize ice in carburetors during cold weather Control deposition of carbon on intake valves Control deposition of carbon in combustion chambers Methylcyclopentadienyl manganese tricarbonyl (MMT)... 

Tetraethyllead is the most important additive used in gasoline. It greatly increases the octane number. Antioxidants are used to inhibit gum formation by oxidation and polymerization in storage, and they prevent potential gum-forming substances from depositing in engine fuel lines, carburetor jets, and on intake valves. Military specifications for... 

---