Rotary Diesel Pump By Gino, Jordan & Adam
How it works •
The transfer pump at the rear of the rotor is the positive displacement vane-type and is enclosed in the end cap.
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The end cap also houses the fuel inlet strainer and transfer pump pressure regulator.
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Transfer pump pressure is automatically compensated for viscosity effects due to both temperature changes and various fuel grades.
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The hydraulic head contains the bore in which the rotor revolves, the metering valve bore, the charging ports and the head outlet fittings.
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The high pressure injection tubing's leading to the nozzles are fastened to these fittings. The injection is only made when high pressure is recognised making the system less effective.
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Distributor pumps contain their own mechanical governor capable of close speed regulation.
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They are comprised of a hollow cylinder called a rotor which sits on a cam and connects to the ports of the distributor head. The rotor sits between the firing cylinders in the engine block and has a small hole in one side. This distributor is similar to a carburettor in the way that it pushes blasts of fuel through to the rotor in time with the piston operation. Sitting on a cam, the rotor turns toward the firing cylinder when it’s about to fire, aligns its hole with the port on the side of the cylinder, and sprays in the fuel just in time for the combustion, before turning again for the next cylinder to repeat the process. The advantage is that the amount of fuel injected stays the same.
Why we don’t use it Its not fuel efficient. Parts are easily damaged. Nothing is measured, including injection timing. There’s a lot of moving parts as the pump is only mechanical.