In order to ensure correction for altitude for the carburetor used on a internal combustion engine, a control system for the pressure within the fuel bowl (8) is incorporated. This control system consists of a pressure splitter (11) that is connected, on the one hand, with the lower pressure of the venturi throat (4) in the area in which the fuel delivery line (7) opens out and, on the other hand, with the induction pressure in the area of the inlet end (10) of the air flow passage (4), said pressure splitter incorporating a pressure line (12) with two chokes (13, 14) that are connected in series, between which the fuel bowl (8) is connected to the pressure line (12). One or both of the two chokes (13, 14) can be controlled as a function of specific air density.
A carbutetor having an intake pass, an axially movable throttle valve, a main nozzle, a main jet fixedly disposed on the lower end of the main nozzle having an axial channel, a conical surface and a planar surface. The main jet comprises a plurality of downwardly directed oblique holes formed on the conical surface and extending to the axial channel. The surface of the oblique holes is made of a rough surface in order to reduce the boundary layer of fuel flowing through the oblique holes, thereby creating a smooth flow of fuel and improving fuel efficiency.
A temperature compensator for a pressure splitter control chamber has two members which have different thermal expansion rates, and the dimensional changes in these two members caused by temperature change affect the pressure inside the control chamber. The compensator is normally designed so that the control chamber pressure is essentially constant with temperature change, but can be designed to increase or decrease the effect of temperature change on the pressure. This temperature compensator is especially useful in a control chamber used with a pressure splitter which is used as a carburetor compensator. The resulting temperature compensated control chamber allows the pressure splitter to easily be set for use with carburetors jetted for different base altitudes.
A carburetor having four distinct features providing improved performance: A sculptured chamber having a D-shaped configuration; a fuel flow interference needle with a number of bevel zones; easily accessible needle advancement and retraction means; and a centrally disposed auxiliary fuel jet aperture emission site.
The air/fuel mixture ratio supplied to an internal combustion engine of a vehicle is modified to achieve a constant mass flow rate in spite of changes in atmospheric temperature and pressure conditions by employing an electronic compensation system. The system has sensors which detect air temperature and barometric pressure, from which signals are developed controlling the float bowl pressure in the engine carburettors, thus modifying the air/fuel mixture ratio as desired. The system also includes provision for enriching the fuel content of the mixture supplied to the engine to provide an oversupply of fuel in cold start situations.
A fitting is installed on the vent system of a carburetor to shield the last opening of the vent system from dynamic pressures caused by wind currents around this opening. This fitting in its simplest form is a plastic tubing "T", which is installed in the end of the vent tubing of the carburetor. It has been found that this fitting is effective in reducing the dynamic pressure effects on the carburetor internal reference pressure. It has also been found that a "T" having a larger diameter cross hole than perpendicular hole is more effective in reducing the dynamic pressure effects on carburetor reference pressure.
