THE HONGKONG TELEGRAPH,
MOTORING SUPPLEMENT. SATURDAY,
APRIL 14, 1928,
REDUCING VIBRA- TION.
ABOUT GASOLINE.
"AUSTIN SEVEN"
We will help you if you wish to buy an Austin Seven by giving incomparable after-sales service, and, if necessary, assist you with a generous Easy Payment System.
ALEX. ROSS & Co., (China) Ltd.
Prince Building.
and; Boor,-Icp House St. Entrance..
STOCKS CARRIED
MOTOR BOATS FOR THE DUỊCH NAVÝ.
The Growing Use of Rubber.
Ideas of American Professor.
[By Israel Rica.)
An interesting article appeared in the Financial News recently on
The kind of gasoline you buy the question of Rubber and Vibra tion. It was pointed out that in should depend on the type of recent years many new uses have motor you have under the hood.
This idea is brought out, in a been found for rubber in automo- bile production, and there are rather indirect way, by Dr. Georga professor of good reasons for believing that Granger Brown,
tho engineering at the applications of this material chemical will be developed still farther, University of Michigan and direc- In the days of low speed engines tor of research for the Natural and rough roads, most of the Gasoling Association of America.. shecke experienced by motorists is address, which was given resulted from road obstacles, and beford the Society of Automotive even then the most effective shock Engineers, is printed in two recent absorber was a rubber product-issues.of the National Petroleum the pneumatic tyre. With the in- Neiva. crease in engine speeds and the improvement in roads there has been a shifting of the relative im-
Dr. Brown reviews the relation-
portance of sources of vibration, ahip of the gasoline and automo- and to-day various unpleasant tive industries, and divides this forms of roughness and noise into thres periods.
Up to 1910, says Dr. Brown, have their origin in the engine.
In the four-cyclinder type we have gasoline was merely a by-product the unbalanced secondary force, of the petroleum industry, and re- and in engines with more than presented that part of the crude four cylinders we often, have oil that was too volatile for kero-
vibration at torsional
certain serie, which was more sorely need- critical speeds. The occupants of ed. But it was fine for automotive the car know of the existence of engines.
these vibrations only through During the war, the next period, their transmission to the chassis gasoline came into so great, a and thence to the body, and, if demand for the fighting forces such transmission can be prevent that it became the major petro- ed, the actual engine Vibration teum product and its volatility becomes much less objectionable.declined.
The result was that
engineers had to It is for this reason that rubber automotive cushions are now widely used for design lower compression motors engine supports, rubber or rubber-to accommodate the low volatility ised fabric spring connexions are fuel. coming into use, rubber centres
hands
and arms of the driver
are insert in clutches to prevent Since 1922, however, anti-knock the transmission of irregularities fuel has come along, and motors in crankshaft torque, and rubber have been redesigned for its use. cuehlons are placed in the pro-
Here comes the diflculty, how- peller shaft connexion to prevent
ever. Before this better fuel guns, 2 depth charges and full the transmission to irregularities
in the torque impressed on that came in, motors had been design- wireless equipment.
Thesu Thornycroft
coastal part. Even the steering gear is to make the best of the poor motor boats are veritable Daniels now in some cases provided with war-time gasoline. The main In the naval sense, for war experi- flexible member of rubber or tendency was to pre-heat the mix- The Dutch Government is the ence showed them to be more than rubberised fabric to protect the ture with the exhaust gases. latest foreign government to a match for battleships of over 50 acquire coastal motor boals, for times their size when attacking noval service, of the type invented under and developed by John I. Thoray croft and Co., Limited, during the Great War, which gave such excel- lent service as patrol boats, &c.
Ordinary gasolene mixed with 20 The two boats recently supplied Yugo Slavia, Japan, Slam and now
Dutch Government, have to 30 per cent, of anhydrous alcohol are each 50 ft. long, and each is the
Mesura. has been approved by the American equipped with two Thoraycroft placed contracts with
Chemical Society an a superior 12-eylinder engines developing 760 Thornycrofts for these boats. h.p. giving a speed of approximate The new Dutch boats will be put motor fuel. Cars using it operated ly 40 knots when fully equipped into service in the Dutch East amoothly, had an easy pickup and with two 18-in. torpedoes, 4 Lewis Indies.
favourable conditions. Their successful achievements in the hands of intrepid naval officers so impressed foreign naval experts that France, Sweden, U.S.A., Spain,
against road. shock.
NEW FUEL APPROVED.
were free from knocks.
Measure Value by the New
Chrysler 52
The New Chrysler "52" owner best knows the ut most in motor car value- judged by, performance, comfort and luxury.
For he has daily experience of its smooth, unfailing speed and typical Chrysler accel- eration and low fuel con- sumption. He rides in substantial wood and steel bodies of full size for adult passengers, on saddle spring seat cushions.
His Chrysler "52" has richer fittings and equipment, up- holstery of finer texture and colour harmonies so much more striking.
Let the New Chrysler "52" be your measure of value in this price field. Inspect care- fully its body features. Then test its performance by actual riding and driving. You, too, will then choose the New Chrysler "52."
And it's still being done. Therefore, it is important that motors with heated intake mani- folds be fod the inferior kind of gasoline, rather than the anti- knock or highly volatile variety.
Dr. Brown explains it this way: "After the motor has become warmed up it is possible to apply sufficient exhaust, heat to the in- take manifold so that satisfactory ed when using fuels that are con- motor performance may be obtain- alderably less volatile than, the minimum specified by the U. S. motor fuel specifications."
From this viewpoint, at least, poor fuel is good fuel for the heated type of motor.
But gasoline refiners now are providing a much better fuel, even outside the realm of the anti-knock These and "premium" gasoifncs. are fuels of "partial volatility."
Used in connexion with heated- manifold motors, this fuel would be found too volatile and would before even became gaseous leaving
The the carburetor. result would be so lean a mixture that it would not burn in the cylin- ders and would cause the engine to miss explosions.
Healing the manifold increases the tendency of the engine to knock, if a fuel of partial volatility. is used.
At the same time super-healing of a mixture as it passes through: the manifold, sayi Brown, causes a loss in power and an increase In fuel consumption, especially at part-open throttle:
With the better grade of fuel on the market, therefore, auto manu- facturers will not be obliged to provide for pre-heating the mani- fold-even for cold weather start- ing.
thoes Meanwhile, however, owners whose cars are so equipped should better stick to the poorer grade of fuel to get the most out of their motors.
On main highways, on country roads or on just
a track over the fields, under all these many con- ditions motorcycles fitted with GOODYEAR Tyres contribute largely to the" enjoyment of these ex- plorations and tours so usual to the motorcycle enthusiast.
GOODYEAR
DISTRIBUTORS
ALEX. ROSS & Co. (China), Ltd.
PRINCE'S BUILDING, HONGKONG.
WHEN DO YOU ENJOY
YOUR CIGARETTES MOST-
Some say one time, Some say another.
BUT ANYTIME
is the time
for
CAPSTAN
2
A. LUNG & CO.
Sole Agents
19, Queen's Road, C.
Phone C.1219.
These days the right hand does not have to wonder so much what the left hand, is doing. The chances are it fo trying to keep the car on the road.
Sold Everywhere