THE HONGKONG TELEGRAPH, MOTORING
The most
Conclusive Evidence
of SUPERIORITY--
... this cross sectional diagram clearly illustrates 7 Points of Superiority which the Air-Flight Principle Tires by Fisk alone can offer you.
:
The De Luxe, Rugged and Fisk, each a Fient Quality, Fisk, embodying all of the exclusive improvements of the new Air-Flight Principle of tire construction. They represent the utmost that your tire money can buy in their respective price fields. Their larger air-chamber, carrying more air at a lower pressure-their carcass, constructed of Fisk's patented and exclusive All-Cord- their flexible sidewalls of live rubber--their streamline tread, multiple cable bead and greater road contact- the combining of all these new and, exclusive features result in still another-The Air-Flight Balance.
FISK'S 7 POINTS_OF_SUPERIORITY
1. Larger Air Chamber
Carrying more nie us a dawać prvoące, it bringt & how and far berwe Ja terperación af Riding Chenluer allargany
bez int more wa che nèr,
3. Multiple Cable
Bend
י
Map Cable Bead *pträs „pėded neengah at the aim while jelog sidewall Ketibiilay,"
5. Streamline
Tread
The rim width of the somalia and dimi peter the unches over hanging weld exbber and allows zerated air cushe laming.
2 All-Cord Process
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nengah włchowy rigidly we might
Increased Flex
Aren
Incred legth of Fies Are
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dewall, provides pereret
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6. Greater Rond
Contact
Kerala Jo
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of Safe Tranny speed.
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7. The Air-FBght Balance The newly perfected balance brzwrea sty and mauriala, schleven the mes- Innsm of sia cushioning sud iniltage.
Sole Distributors ·
GILMAN & Co., Ltd.
Telephone 28011,
da, Des Voeux Road, O
SUPPLEMENT,
SATURDAY, MARCH 7, 1931.
HOW CARS WASTE PETROL,
Lessons From the Economy of Commercial
Vehicles and Diesel Engines..
24
739843 59
.ព
AD
.70
42
13
20
2.6
12
2.4
10
7
67
9,5
107
1)
For example, nt 30 m.p.h. the Concurrently, a real attempt car in question can actually give should be made to reduce car 91 h.p. If the throttle be opened weights. The heavler the vehicle wide, whereas only 8 h.p. are re-the greater is the power reserve quired to maintain this speed on required to give reasonable ac the level. In other words, tholceleration. Furthermore, a gren- load factor on the engine is only ter power is needed for hill-climb- 26 per cent, when 30 m.p.h. is ing, which also results in a waste stendily maintained. This big of
of fuel. The linus along which power reserve (74 per cent.) is designers should work are there- demanded by the owner for ac fore towards reducing air reals- celeration and
is
table, invid Billclimbing. The 'tance, improving ongine eficiency In typical 3-litre car based upon at low lond factors and cutting h.p. down the weight of the complete (rating), walghlig about 30 cwt. vehicle to a minimum.
20 of Rome
there
start-
Wonderful progress has recent-17 hp, car ly occured in the art of building 10 hp, car lorries and buses driven by oil 16 hp, car engines. This raises the question hp. car of how long a time will elapse 10-cwt. van
20-neater bus 6 before a general attempt is made Lorry (4- to cure private cars of their habit
cylinder) 0.0
on our crowded roads, and of consuming about four times ns Diesel lorry 11.1
Apart from the Somewhat larly in towns, much petrol as should, strictly Diesel six-
are ling changes in fuel consumption very many occasions when 20 which may come about if drastie speaking, be necessary, It is stated Wheeler 18,2
163 m.p.h. or 30 m.p.l. is maintained alterations in motorcar design are in a recent Issue of the "Motor." Some representative agures for for quite long periods of time, undertaken, a great deal could at Quita
commercial cars and commercial vehicles areThe throttle is thon vory nearly once be done to secure enhanced vehicle wih a Diesel engine ac-given in Table 1, from which it closed, and, consequently, the com-efficiency frem automobiles in their
recently hieved the remarkable figure of 163 will be seen that whereas cars pression pressure,
upon which
present form. It is known, ton-miles per gallon, representing average-24-30 ton-miles per gallon, efletency to a
extent de-for great an equivalent figure of 109 m.pg. for petrol-driven commercial ponds, is greatly reduced. Broad-engine is more economical
for example, that a medium-powered car weigh-vehicles the range in 45-65 and Ing 30 cwt. Such a car ordinarily Dieseldriven vehicles it is 1 for ly speaking, there are two ways of either a "six" or an
this difficulty, overcoming
one for size and
for
12
consumes one gallon in 20 miles, The disparity is so enormous as to require explanation and Investiga- tion,
Motoring Fuel Bill Relatively Small. have not yet taken very much interest in the question, because the fuel bill, for the time
Motorists
well
•
four-cyRION "eight,"
"Bizo
and weight for weight. Table IL-Power and Speed. being to employ à much smaller The reason is to be found in tho Speed h.p.
combination with some fact that the distribution systema engine in Lond h.p. m.p.h. available needed factor
form of infinitely variable Rear, of most six-cylinder and aight and
the other to use a constant cylinder enginers fail to provide compression engine. The Dleach the same mixture strength to each power unit is of the latter type, cylinder. Hence the carburettor because air alone is compressed, must be given a rich setting to there is no throttle, and the power enaure even Aringa wasteful
20
20
4
20
30
81
В
26
40
42
IG
15
50
50
26.
· 50
60
58
40
05
GG
100
It is rather extraordinary to output is simply regulated by ad-method for securing emoothness, being, is relatively small in com- find that an oil-engined lorry with Justing the quantity of fuel injeet-
parison with other expenses, such as tax, Insurance and depreciation, Manufacturers bavo.
therefore been concentrating upon moro popular aspects of car per-
1.
the
total weight of some 18 tons can cover very nearly as many milos to a gallon of fuel as a 21⁄2-ten privato car. The vehicle in ques- tion is the alx-wheeled six-cylinder Mercedes-Benz.
very
ad.
Mechanical Ingenuity Assist in Solution.
many
Constant-compression Engines
Thermostats and shutters, now Demanded.
in general use, enable engines to been
Constant-compression petrol en-warm up more rapidly than in the gines have been designed with past, so removing one formance such as power rekurve,
cause of Buck
aliding cylinder heads, variable fuel wasto, namely, too low Д top-year acceleration, flexibility
Large though it is, the reasons strokes and other complexities, working temperature. Gearboxes and the capacity for high cruising
for this difference in performance but it is doubtful whether they and back axles still take speeds, These attributes,
are not far to acck. They may be could ever be made practicable.miles to become warm in winter, aro though desirable, in the
summed up in the statement that There remains the previous solu- however, and the Rear-wheels nature of luxurles, for which we
at low speeds the private cartion of an infinitely variable gear waste a surprising amount of are undoubtedly paying at present suffers from using only a tithe of with a small engine. This could power when churning thick, culd too high a price in fuel consumed.
On the other hand, the commer- at high speeds it has to cope out a wholesale alteration to the might prove a solution.
Electrical warming plugs the engine power available, whilst not, however, be satisfactory with all. cial vehiclo user regards a low with fuel consumption
considerable as being of resistance.
air general shape of the car, because Driving methods also play
the small output of the engine part, as was recently pointed out importance; paramount
The first point means that the would not enable high cruising in the "Mator" by Prof. A. M. Low, makers of lorries and buses have engine must be run inefficiently speeds to be maintained against The main thing is to avoid sudden therefore given great attention to on light loads when travelling air resistance of the kind which changes of speed. The driver this
subject, which, in the opinion slowly, and the second implies ex-
who alternates between heavy of the writer, private car makers cessive fuel consumption, in over will be seen that the specimen cur employing the geara, usos much braking and flerce acceleration, would do well to emulate.
When
comparing various
Iarrely be avoided if the ear requires only 26 h.p. to propel it more fuel per mile than one who vehicles, the proper unit to use is were streamlined. Owing to this at 50 m.p.h., whereas to achieve 66 malatains & more steady speed. the ton-mile per gallon, arrized second factor a car capable of m.p.h. the power must be more Low gears are another cause of at by multiplying miles per gallon running. 20 miles to the gallon at than doubled (55 h.p.). This is fuel waste; If a "silent third" is by the weight in tous. example, a baby two-seater weighof fact in 44 miles at 60 m.p.h.
For 30 m.ph, will consume a gallon largely due to the enormous air avaliable for acceleration and
resistance experienced by the hills,
It is ridiculous to retain bluff, squareshaped front of the top gear as low as to I, which average saleon car. By reducing forces the engine to run at very sir resistance the propulsive effort high speeds when the ear in cruis- needed at high speeds could be ing at 45-50 m.p.h. In view of the Inssened and a small engine with a preference which many drivers suitable transmission could then display for the direct drive there shows the full-throttle horse-be used. This would work very is much to be said for a three- power available, together with the much more efficiently at the lower forward speed gear-box coupled horse-power actually needed for speeds, so that a two-fold saving with an “overspeed" gear for main- ench of the speeds considered. in fuel would, follow.
road cruising.
ing half a ton And covering 40 miles per gallon, gives a figure of 20 ton-miles per gallon. a per- formance which is exactly equiva
coming windage, which
could
Big Surplus of Powers Which is Unused. Some iden of engine conditions lent, in merit, to that of a one-at, different speeds will be obtain ton car doing 20 mp.g, or a tus fed from studying Table fl. which Ion car doing 10 m.pg.
Table Fuel Consumptions
Weight, Miles per Ton-miles Vehicle
tons gallon per gall.
we countenance at present.
Referring again to Table II,
TRUST A THORNYCROFT WITH YOUR TRANSPORT
DEAL DIRECT.
THORNYCROFT
SIX-CYLINDERED
COACHES & OMNIBUSES
MOTOR VEHICLES
Pioneer Manufacturers of Commercial Motor Vehicles
4 or 6 Wheels
4 or 6 Cylinders
30 Cwt. to 10 Ton Loads 20 to 70 Passengers
JOHN I. THORNYCROFT & CO., LIMITED
Pioneer Building, Nathan Road, Kowloon.
TEL. 56752.
TRUST A THornycroft WITH YOUR TRANSPORT
'Just look how easily and surely that new Buick dodges in and out of traffic!"
"Yes, Sir, it's no wonder that owners of all cars
from the lowest to the highest priced envy the driver of the new Buick.”
Notwithstanding the tremendous flow of smooth power and speed the new Buick valve-in-head eight in a line motor places at your command-the new harmonized steering gear and balanced chassis give the owner perfect control under every driving and parking condition.
This outstanding quality is but one of dozens of qualities which have made Buick so popular thruoghout the world 'for the past twenty-five years-a con- fidence enjoyed by but few cars except Buick.
114" Whoolbaso Buick Models... 118 Wheelbase Buick Models
124" Wheelbase Buick Models... 132 Wheelbase Buick Modela
The New
G$1,530 to G$1,655 G$1,820 to G$1,930 $2,160 to $2,195
082,160 to G$2,705
BUICK 8
The Eights with Buicks Prestige
THE DRAGON MOTOR CAR CO., LTD.
TELEPHONE 30228-
39, WONG NEI CHUNG ROAD, HAPPY VALLEY.