1925-11-07 — Page 11

THE HONGKONG TELEGRAPH,

A. J. S. "G. 5". 2 II. P. 1920 MODEL.

Right from the Start, you enjoy healthy, snfé and eney travel for a fraction of a cent a mile,

Electric Model

$530,00

Alex. Ross & Co., (China), Ltd..

BANK OF CHINA BUILDING, HONGKONG.

BOSCH SPARK PLUGS:

Made in many different types and admirably adapted to the varying designs and operating conditions of motor cars and motor cycles:

r 1212 e 18 mm for cycles. $1.00 $1,00 r 1636 o " for Fords. r 1616

..

I m/m motor ears $1.00 r 2212 e 18 mm for motor cars $1.00

r 2218 e 18 mm for motor cars $1.00 BOSCH PRECISION SPANNER:

A tool required by every driver and a mechanic. Jaws opened and adjust- od with one hand. Lock nut fixes position of jaws. Positive stop pre- vents opening spanner too wide. 5-inch

$2.10

Platinum Points (B) For Motor Cycles:

Short

$4.00

Long

$4.00

Platinum Points (7) For Motor Cars:

Short

$7.50

Long

$7.50

THE DRAGON MOTOR CAR

COMPANY, LIMITED. Telephone Central 1246, or 1247. 35, Wong Nei Chung Rd., (Happy Valley.) Pay close attention to the name of ROBERT BOSCH and this

THE PLAIN MAN AND HIS CAR.

(Continued from Page 1)

Timing.

MOTORING SUPPLEMENT, SATURDAY, NOVEMBER 7, 1925.

TRANSPORT CONGRESS.

FIFTY COUNTRIES REPRESENTED.

Invitations are being mailod In an engine such as the patrol this month to all countries of the type of combustion engine om-globe inviting automobile men ploying a relatively complicated everywhere to attend the second cycle of operations such as the World Motor Transport Congress "four-stroke" or Otto cycle the which will be held in New York power which the engine will de-January 11-13, 1926, during the liver at various speeds of the National Automobile Show. crankshaft depends to a vory large extent on the setting of cams on the camshaft and the time at which the sparks are ar. ranged to occur in the cylinders.

Assurancos of participation have already been roceived from 50 countries speaking 16 different languages,

Tho National Automobile In the description of the four Chamber of Commerce is the host stroke of the pistons which are on this occasion which is a con- necessary for the carrying out of tinuation of the first Congress all the operations required to run held at Detroit in May 1924.

The economics and utility of the engine no reference was made to the possibility or arranging motor transport were the chief that the inlet valve, for instanca, topics at the first conference. should not commence to open This time emphasis is to be placed exactly as the pistons begins its on sales, advertising, and service downwards travel on the inlet methods.

During the first five months of stroke. Mention of this possibil-

were 228,537 ity was avoided for the sake of this year thero clearness, but it may be said American cars and trucks ship- now that an engine "timed" as ped to 101 countries and colonics regards opening and closing of of the globe, a record far exceed- valves exactly as then described ing any previous mark in the ex- would be notably lacking in live-port business.. It is felt that most liness. The same remark applies parts of the world have passed to the ignition timing then indi-the preliminary stages in motor cated, ire. the occurance of the transportation and are ready to spark in the cylinder just as the study up-to-date solling methods. The Congress is to be conduct- piston commence its downward travel on the explosion stroke.

ed on the basis of exchange

The meeting is to be an open one to dealers, manufacturers, engineers and others in foreign countries who are interested in the American automobile in- dustry. Special invitations are being sent to delegates who at-

ended in 1924.

In determing the timing of val- of experiences. The American ves and ignition which will give manufacturerers hope to learn a the best results in a given engine great deal from visitors from the first point to be considered is abroad and in return they will that the mixture which has to be provide complete exhibits of the exploded is in gaseous form and way in which motor transporta- will therefore he subject to the tion is merchandised in this laws governing the flow of gases. country. The inertia of the column of gas in the inlet system causes the gas to "lag" behind the downward travelling piston on the inlet stroke and to continue to flow in to the cylinder for a short time ufter the piston Has come to the end of the stroke. Similarly the burnt gases are at a pressure which may be as high as 60 pounds to the square inch at the conclusion of the explosion stroke, and it is clearly of advantage to give them as much time as pos sible to escape from the cylinder. The pressure above the piston is not exerting a very great lever- age on the crankshaft after the angle between the crank and connecting rod decrease many de- grees from a right anglo, i. e. after the piston has travelled about three quarters of its stroke. and it may be advisable to ar rango for the exhaust valvo to open at this point, allowing the

AUTO OUT OF LUCK.

Holborn, Eng, Sept. 14-An automobile struck a pedestian

heaviest part of the work of clear-here recently. Instead of being ing the cylinder of burnt gases to crippled the pedestrian utilised be performed by the gases them- the force of the blow to turn a selves before the piston commen-somersault and escape without ces to rise on the exhaust stroke. injury. He was an acrobat. For purposes of comparison an engine timing in which the two

valves open and close exactly on the exhaust stroke. The valve crankshaft doad centres and the

closes when the piston has pass- sparks occur on top dead centres ed bottom dead centre on the is termed an "absolute", timing inlet stroke and has travelled a Timings actually found in prac-distance equivalent to a fifteon! tice are measured by the absolute timing.

advance opening and fifteen de grees late closing" would be a timing in which the inlet valve opens when the piston has yet a distance equivalent to a five da- gees movement of the crank to travel before reaching the top of

Thus an inlet valve degrees movement of the crank

on the compression stroke. timing described as five degrees The spark takes an appreciable time completely to ignite the mixture, and as complete com- bustion is required immediately the piston has passed the top dead centre between compression and explosion strokes it is neces- sary to arrange for the spark to occur while the piston is still rising on the compression stroke. Over and above this ignition advance depending upon the setting of the magneto drive there is the further advance per- mitted by the ignition timing control lever already referred to. Use of this control will be dealt with later.

16 KNOTS

AILSA CRAIC

FAST RUN ABOUT

BRITISH THROUGHOUT

Complete $2750.00

DODWELL & CO., LTD.

་་

DELIVERED HONGKONG.

Sole Agents.

་

..

It is impossible to generalize about timing variations in articles of this nuture, as different en- gines employ very different timing settings, but a timing that might be found quite suitable for: an engine designed to give good pulling" on top gear and yet be capable of fairly high revolu- tions on lower ratios is as fol lows:-

Inlet opens 5 degrees lute Inlet closes 30 degrees late Exhaust opens 45 degrees early Exhaust closes 5 degrees late Ignition, when control lever in fully advanced position, 25 degrees advance. Makora of an engine always supply, full particulars of the timing in use on the engine and instructions for resetting cam-1 shaft or magneto drives should these be disturbed. The system of measuring timing advances by angular movement of the cranks, is more accurate and more con- venient than alternativo systems. As the timing of one cylinder correctly ensures automatically correct timing of the remainder it is easy for makers to mark the "setting points" for a given cylinder on the face of the engine flywheel.

BRITAIN LEADS IN CAR VALUE

The New

MORRIS

RECISTERED TRADE MARK

Programme

REDUCED PRICES

F

BETTER CARS

OR the season commencing September 1st, 1925, MORRIS MOTORS, LTD., who make more and better cars than any other British manufacturer, announce the following important improvements in their cars

1. The provision of four-wheel brakes on 11.9 h.p. Marris.

Cowley models.

2. The fitting of reinforced balloon fyres on all models.

3. The provision of dipping headlamps on Morris-Oxford ca

4. Thermostatic control of engine cooling an

Oxford models.

Morris-

5. Important detall Improvements, especially in the coach.

work of all models. Additional to these items uone of the features that have made Morris Cars so overwhelmingly superior during the past twelve months has been omitted. Instead, still better cars are being offered at still lower prices

buy British-

and be Proud of it.

The new Morris-Cowley Two-seater. Finest motoring value in the world, Completa with four-wheel brakes, Lucos 12-volt lighting and starting equipment, balioen fyres, Gabriel Rebound Snubbers, spring gaiters and full equipment, has so competitor în ita class at the price at which it is now offered

Call and see these models either at our showrooms or the showrooms of our Authorised Sub-Dealers imantfened below

THE HONGKONG HOTEL GARAGE,

(THE HONGKONG & SHANGHAI HOTELS LTD.)

Show Room-Phone C. 4759

Garage

Phone C. 4602

The fittest survive!

The fittest survive! Neither men nor machines, if they are unfit, can loog withstand the crushing strain of an exacting existence.

Buick Valve-in-Head motor cars are built on principles that were established when the motor car industry started, and that these car's survived without change in their fundamentals is convincing proof that they are constructed on basic principles that are correct. In the making of Bulcks there has been no yearly shifting from one set of engineering and manufacturing principles to an entirely different set. The Buick Valve-in Head principle was right in the beginning, and it has been right ever since. Each passing year finds this great principle more firmly and securely established In the estimation of the motoring public.

The Valve-in-Head principle is the great reason for the survival of Bulex motor cars. If this principle had not been correct, Buick, too, would have found it necessary to jump from one kind of engine to another in a ceaseless effort to find something that would stand the grilling work a motor car is called upon to do. The Buick has survived every test that more than a million and a quarter users could devise in the most exacting conditions of worldwide service. There could be no better proof that Buick is the fittest among motor cars.

BUICK

VALVE-IN-HEAD MOTOR CARS

Please call or Telephone C. 1036.

CO., LTD.

HONGKONG & KOWLOON TAXICAB CO.,

33 & 35 Des Voeux Road Central.