Development of a new design for the Reduction of Liquid Fuel Consumption in standard IC Engines
July 26th, 1980
Report to Patreal AG
S F Bush
Summary
The development yields new patentable property and is derived from the application of theoretical and experimental work on two-phase flows made over a period of time and tested on a number of different processes.
Fuel consumption tests with the device, on a well-tuned engine, are summarised. Briefly they show around 12-15% savings in city traffic and around 3% at steady speeds from 50-120 kilometres per hour. These savings are possibly 75% of those achievable.
The basic concept is to utilise a tiny fraction of the kinetic energy of air flow between the carburettor and the inlet valves of the cylinders to create a more uniform fine spray of liquid fuel than would otherwise be the case, and additionally to improve the fuel metering between cylinders. Key importance is attached to not increasing the pressure-drop in the manifold by any significant amount. It appears that in some designs at least a degree of pressure recovery may be obtained to offset pressure energy used in the droplet creation.
The designs thus obtained fulfil a further requirement, namely ease and cheapness of fabrication. Additionally although this has not been tested, it is believed on theoretical grounds that maximum power output will be increased. This is supported by subjective observations by drivers of the Escort car on which the fuel consumption tests were made. These observations are of a greatly increased engine flexibility through the gears. Tests to be done will investigate both power and cylinder emission uniformity.
NB The figures for fuel savings were revised downwards in later tests.