Autocar EorroR Maurice A. Smlth D.r.q aPoRTo EDrroR Peter Garnler AgatB?altr EDlroFg Leonard A. Ayton, Honald Barker f,IDLAIID EDtroB Edward Eves ABT EDtroR Howard Vyte

26 JUNE I964

nar^orro otREoroR H. N. Prlaulx r.e.e-

Cutting Fuel Costs T\RITISH motorists are becoming increasingly fuel J{ e.onomy conscious, to iudge by the signs and indi- .U cations that cross the editorial desk. Although petrol is basically a quite cheap liquid, we,motorists have to pay a gxeat deal for it, around half the cost being ter. Except that many drivers lack anticipation -accelerating and braking too much---and some use ex- pensive grad& of petrol when cheap ones would do just as well, 1ie geneml idea is to keep petrol costs down and to favour cars with a modest thirst. On the sub- iect of choice of fuel. we still marvel to see how many m.p.e.-conscious moforists are grade-unconscious and wastE money io the fond belief that they are being kind to their cars or obtaining bctter performance when they run on the most expensive grade of fuel, regardless of whether the engine is desigrred for it or not.

French and Italian petrol is ever mote heayily taxed than is British; this may account for the rather better fuel consumption-on the whole-of Continental family cars as measured in several of our road tests. The latest C-ontinental family cars tend to be lighter and to run well on middle grades of fuel. These are trends that British designers have noted and will need to watch.

Apart from desigrring a new high-efficiency engiue such as that, san of the Hillman Imp, development work on poning and manifolds of older engine designs can improve the fuel consumption for a given performancealthough if, as a result, a driver is also offered a little rnore performance, he nearly always uses it and so offsets the gain in fuel economy.

Compound carburettors are also being fitted which run more economically on a light throttle with the aid of one small choke (with higher gas vdocity), and call on the secord choke only when high power is required. Such carburettors are rather more elaborate and expensive than plain, single-choke kinds, but a cornpouDd carburetlor can take the place of two others without loss of performance or response, ard the delicate adiustment can be done purely on the one primary choke.

Carburettors are still not entirely trouble free and after a year or two they usually need, but seldom receive, adiustrnents and cleaning, and perhaps minor replacements, beyond the skills of the ordinary orl/rler, if they are to conLinue to function effciently.

Fuel lniection AI-L CARBURETTORS compromise over the *ixture an engine needs at various loads and speeds. Fuel iniec- tion systems, of which there are several kinds, have some significant advantages to offer in this.respect, b-ut in the pa-st they have aliays beel expensive- In this issue (p 1252) we describe an enrirely lery 1nd vrery.egcouragiiig Briiish sysrcm for iniecting fuel into the inlet ports (n6t directly'into the cylinderi). At this early stage it may s.em 'ibit and piecy" but it shows great-promise. TbL components areiimile and quite cheap, which cannot be said of injection p*pt and metering devices; in production many of them might be grouped together in a single die-cist unit. Given volume production the orice coldd match that of the more elaborate or multiiarburettor slEtems and approach those 9f the simple carburettors which have been developed over many vears. " First applications of this new Tecalemit iniection svstem are likelv to be on powerful sports engines, which stand to -gain most in increased performance, better consumption arul reduced cost.

A stimulus for the development and adoption of fuel iniection nury come from the air pollution authorities wiro in Ameiica are already concerned about the partially burrrt exhuaot gases which engines push- out. oartictrlarlv on the overrun. Closer control of fuel iupply and mixture is possible with an iniection system.


[e Mons Report . .

French Cor Review Trovel Tolk Rood Test.' Vouxholl VX 4-90 New Products .. Correspondence .. Tecalemit-Jockson Fuel lnjection News ond Views . Ferrori 330 GT lmPressions fhe Sport French Cor Doto..

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