THE DYER ATOMIZER.
Page 19
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A Well-tried Device Which Gives 40 Per Cent. Fuel Saving on Fords and 20 Per Cent. on Other Vehicles.
r111-1E PRESENT-DAY -grades (if 1 petrol are without a doubt slightly better than those which were obtainable (hieing the period of the war, but their :Lverage specific gravity is so little different that any means which aim at effecting better and more complete carlineation_ are to be welcomed. If a better feel consumption and good running are to be secured_ it 1& imperative to heat the fuel before it eetere the cylinders. Carburation: materially affects the run-. Meg of an engine, and it has been proved by " actual experience that the mere ceoriornical._ the carburetter the better will be the running of the engine.
Many devices, both simple and complicated in their construction, have been introduced from time to time with a view to reducing petrol consumption, but few of them have withstood the test of lengthy trial: The Dyer aternizer, which we are about to describe, is, however, an exception to this rule, for it has withstood most exhaustive and searching tests on both heavy and light vehicles, to which it has been subjected by the British War Department.. These tests were carried out over a period of two ee'ars, and as a result of the satisfaction v Inch accrued the atomizer was finally adopted as a standard fitting for heavy transport vehicles of the Royal Air Force in ,Tanuary, 1919. No fewer thari 2,000 Dyer atomizers for attachment to Levland lorries have been made in Royal Air Force workshops, and it has been found that on these vehicles an average m.p.g. equivalent to 25 per cent, increase has been attained.
If reference be made to the drawing reprodnced herewith, it will be seen that the atomizer consists of a truncated cone, which is constructed of a metal having high heat conductivity and fitted with a series of fine gauze screens (B). This coire serves the purpose of a mixing chamber and a choke tube, and the gauze ecreens act as an atomizer for the ineomrug .mixture. Surrounding the cone is a
metal easing (C): through•which the exhaust gas is passed by entering the •bypase (D), mid-leaving .by.thelay7pase (ET. As we have already .saicre entoplete 'carburation, especially of -heatry fuels-, cannot be -achieved :IN ith04 the application. of heat. to the inixturte;,kiti. this exhaust .gai"Stipplies the neeessary.,-heateto the ' cline . (A), and thus :.n.s-stets in securing perfect gasificationof the fuel. • •• .
Incorporated with the atomizer is the Dyer an valve, NvhiCh gives automatically the exact proportion. of air In Secure the-maximum efficiency an•d economy at all -speeds. of the engine.
• . The air Valve is screwed into the induction pine immediately above the atomizer, a length of tube being fitted if necessary with the valve at the outer end. One of our drawings shows that the valve consists of a lever (A), on the outer end of whirls is fitted a revolving pin (11). This lever is fixed to the carburetter throttle. -lever rod. By the operation of the carburetter control, the lever slides and revolves a slotted . arm (C) attached to a disc plate (D) on ton of the valve body. This disc plate has a semi-rotary movement clockwise or anticlockwise as required. The top plate of the valve body said the disc .plate are .slotted with, eccentric -openings (E),•nrl aS the throttle is operated the openings coincide in such a, manner as to give exactly the correct quantity Of air at, all positions of the throttle, i.e., at all engine speeds. The greatestdemand of4air is from nearly-closed -throttle to half
throttle position. . •
This briettde,seription will help our readers to Understand the construction of the Dyer atomizer, and as the practical results seem to be just as satisfactory as the theoretical principles, there is little doubt that the atomizer will achieve much popularity amongst commercialvehicle users generally. Special atten-. time has been paid to the requirements of commercial-vehicleusers, and already the atomizer has been standardized for
most makes and types. .
We were afforded an opportunity of testing the merits of the atomizer on a standard Ford vehicle equipped with and without the device. Over a measured. distanceof 24 miles the Ford ear averaged .28.2 m.p.g. without the atomizer, whilst with t•he fitting • 40.9 m.p.g. was aceomplished, showingla peccentage say-. ing of 45.03. The whole tdst was under our close and critical observation: The day en which we ututehoek this test was a gond one for carburation, itirt the results are. nevertheless, remarkable, and witheut doilbt prove the efficiency of the atomiser.
Rerbert-MacCallum and Co., Ltd., 63, Great Portland Street. London, W. 1, haVe neen appointed Sole conceseionnaires of tli•e Dyer atomizer for the. Uniti6d. Kingdom, which is being manufactured by the Middlesex Autocar Co., Ltd., Golder's Green, N.W. We bad an opportunity of inspecting the works where the atomizer and air, valve are being turned out and; judging from the numbers which were to be seen in course of constriction, it is evident that there is already a big demand for them.