1928-10-27 — Page 18

6

CHANGED CON- STRUCTION.

Nash Four-wheel

Brakes,

Construction of the braking system of the Standard Six of the new Nash "400" series is interest

THE HONGKONG TELEGRAPH, · MOTORING SUPPLEMENT. SATURDAY, OCTOBER 27, 1928.

FOR SIMPLER LAWS. THOUGHT IT SAFEST. THE SPARK PLUG.

The California Motor Vehicle)...... Conference is considering more

than two score proposed amend Model Driver Departed.

ments to the stato vehicle act, In un effort to simplify and modernize] the state's traffic code.

brake support plato la provided with a small inspection hole cover ed with a plato, to allow for brake-

Another idol has exhibited feet of clay.

After winning his city's medal as its "safest driver," Henry (USA), has been fired fifty Bordicotte, of Massachusetts dollars for leaving the scene of An accident in which he was involved.

SPARKLESS AUTOS,

Ing.

The entire front wheel brakes shoe inspection. are of new design-the brakel

This front brake support plato operating the lever pin has been is equipped with an oil shedder moved from steering knuckle to that prevents oll escaping into the axle beam and now connects to front brake lining.

The rear brake operating cam by link to wheel brake drum and brake shoe The first nutamobile-it wHS A give greater leverage and quiet plate are new. Two stondy "one-lunger"-had no spark plug. noss. The edge of the front brake brackets have been added to guido Ignition was accomplished by a drum has been flanged to give the rear brake band and a new hot tube" which had to be preheat greater stiffness. For the owner rocker shaft steady bearing added ed by the driver, with the use of a driver's convenience, the front with a longer arm.

blow torch.

Come to our Showroom and let us dem nstrate to you

THE NEW

Six Cylinder

HUPMOBILE

5-SEATER.

7-SEATER.

SALES DEPARTMENT

SEDAN.

DRAGON MOTOR LIVERY SERVICE.

(Proprietor: C. F. PAU.)

I

Sole Agents for Hangling and South China,

24 D:s Voeux Road Central. Tel. C.482 & C.3552.

A Most Neglected Part.

USEFUL HINTS.

The spark plug has been one of the most neglected parts of the motor, despite its relatively high Importance. Now, with the coming of high compression engines, and the existence of so many different. types, this little ignition unit in even more important,

It has to be of the right sort for the particular motor you are opera Ling, or you won't got the efficiency you should be deriving from your car. Merely ordering a spark plug from a dealer isn't enough. Not only should the mako of automobile be mentioned, but the particular model, or you will fail to get the most out of your motor.

* *

Here. Figure 1, for example is a apark plug that is much too short. With the ignition points set so far back in the cylinder head, some of

the unburned uses will stay be hind in this little pocket during the exhaust stroke, with the result that. the ping will become fouled and in- efective. The motor becomes aug- scish and fuctjernt,

The gases that reninin behind duc to the incressed space in the com- bustion chamber, from a short spark plug, will al30 pre- VENL

proper firing uf Lhe fresh incoming charge. Thus when the next spark occurs, thera will be delayed burning, causing over-heating of the motor, as would result from the use of a retarded spark.

This causes not only less of power and fuel, but a sluggish motor, difficult to start and slow in ac- celerating. At times, too, the motor will miss at high speds.

* •

Here, on the other hand, Figure 2, is a plug that is too long. Extend- ing so far into the combustion chamber, the plug is exposed to the

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A.

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With the new Plymouth, Chry sler is the first to give, at 10 low a price, the advantages of performance, rkling ease, de pendability and full adult size which characterise fine cars of higher price,

It is so revolutionary an advance over other low-priced cars, it is such conclusive evidence of the past year's strides in the science of motor car manufacturing that you will surely want to see it and drive it.

A Plymouth ride is the best demonstration of the ease with which it leaps from 5 to 60 and more miles per hour-the quiet of its power and the smoothness of its flight. You yourself must

LUNG

19, Queen's Road, C.

put your foot to the light-action internal hydraulic 4-vi-il brakei to knowthe confidence of the fastest and safest deceleration you have ever experienced. And above all, you must see its beautiful lines and finish, and stretch at case in its deep uphol stered, full adult-size bodies, to comprehead how completely the Plymouth surpasses cars in the low-priced field.

E

Please see and ride in the Plymouth. We believe you will discover there has never been a car anywhere near its price that can approach the Plymouth for power, pick-up, smoothress, easy handling, safety, quietness and roominess-nor that can" equal it in beauty and style.

Ở CO. &

Tel. C. 1119.

TOYS USED FOR STUDY OF SKIDDING.

How U. S. Engineers Learn Reasons for Road Slips.

[Special to the Hongkong Telegraph.]

The Hak eQuality

Gum-Dipped Cycle Tyres

A cycle tyra that will give you confidence in any kind of "going." The tread is scientifically designed to hold fast when turning, twisting and maneuvering in traffig. Under thus safety troad is a carciss built f cords dipped in rutibor solution, providing extra stamina, strength and long wear, and protecting the cords from 'fatigue. Economize with Gum-Dipped Cycle Tyres. Call upon us when.

MOST MILES PER DOLLAR

Firestone

THE DRAGON MOTOR CAR CO., LTD.

Telephone Central 1246 or 1247.

31, WONG NEI CHUNG ROAD, HAPPY VALLEY,

full heat of the explosion. This

Washington, Sept. 25.-Several

| explosive temperature causes the electrodes to become red hot, re- aulting in pre-ignition and all its familar dificulties-knocking, lossgineers in the U.S. Bureau of

grown-up, Aerious-minded en-

of power, missing and back-firing. Standards here are playing with

'.

*

Compression ratios of engines differ more to lay than they used ta. Besides, the rate of cooling of an engine and, its speed vary with the make or model and have much to do with the cholee of the proper kind of spark plug.

a number of toy trucks and auto- mobiles, running them down a toy hill and along toy streets.

And Uncle Sam pays them for the fun!

But it's more than fun. It's a laboratory Investigation into the mysteries of akidding.

Greater heat is generated in the motor to-day, what with the development of higher

Here is one extensive cause for compression ratios and higher speeds for the engine, Spark many accidents on our highways plug manufacturers have therefore that engineers so far have been had to design a plug that could ably unable to fathom. The scientists withstand this increased heat and of the Bureau of Standards have continue to operate well.

therefore decided to unravel this mystery by the simple expedient of operating skidding automobiles under laboratory control.

But to perform efficiently the electrodes niust nut become too hot

*

The right kind of a spark plug for your mator, as shown here, Figure 3, fits so that the bottom of the plug is Bush with the inside

The safest way to do this was to use toy automobiles and place them on an Inclined

plane resembling hill conditions. The truck, for instance, has brakes controlled by tiny electro-maguets at ench wheel. These can be set at any required brake přessure and the truck started down the "hill,"

Traced on Paper.

C. B. Binhop, engineer of the automotive division of the U. 8. Bureau of Standards at Washington, is shown here with the toy truck and autos used for the laboratory study of akidding. The inclined plans is the "hill" and the lines and arrows are the engineers' methods of determining the direction and degree of skidding.

The first thing learned is that juan be avoided on wet pavement skidding resulte when the front if from 60 to 70 per cent. of the wheels of an automobile are turn-braking power is applied to the The toy "will" can be raised or ing and the rear wheels are locked front wheels, and the rest to the lowered to BE!mulate. various suddenly. The centre of gravity rear wheels. This is contrary to grades. Over the surface of this of the car may continuo in a prezent practice, It would not "h" is a large sheet of paper straight line ahead, but the car permit easy control of the steering wall of the cylinder head, and the over which ordinary tracing paper spark gup extends a little beyond is placed. As the truck rolls down itself will make a complete turn-wheel; with the front wheels under

such great braking pressure. into the combustion chamber. The the hill and goes into a skid, the about, gap should not extend more than movements of all four wheels is

If the front wheels are directed But the scientists say that stoor- three-sixteenths of an inch from the traced on the paper. Knowing the bottom of the plug.

brake pressures on the wheels, the straight ahead and the rear wheels ing can be regained almost imme- That it is essential to get the engineers can study the forms of are locked suddenly, even on a wet dlately, if the ear is to be stopped right spark plug for every motor, is skida from the tracings on the pavement, there is little likelihood In an emergency, by momentarily of a skid. Despite this fact the roleasing the brake, steering the shown by the fact that spark phpaper.

thon almost imme-

manufacturers make many different Not content, however, with this engineers say it is dangerous to car and types of plugs for varying car laboratory "game," the engineers try to "straighten out", the car diately applying the brakes again. If moat of the braking pressure. models. One maker, for instance, have taken their own automobiles while it is skidding by turning the makes 18 different tvnce of spark out on the highway and attempted front wheels in the opposite directa in front, also, care must be plues for pleasure cars alone. in practice what they had already tion to the skid..

The number of types for racing seen done on a smaller scale.. The Most Braking in Front. ears is even greater, this company road, of course, is kept clear and having developed some 20 models the driver is an expert, whenever for these very high compression these practical tests are made. jobs.

саве In the

of four-wheel brakes, it is found that skidding

maintained at all times, and sud- don stops avoided." A sudden stop, under" such conditions, would throw the occupants of a car for- ward with a dangerous jalt.