. Automotive industries . til after igni-tion. To do this it is necessary to reconcile two conflict-ing conditions—the two portions of the charge must beprevented from mixing till after ignition, and at the sametime there must be sufficient turbulence in the combus-tible charge to insure rapid combustion. These two con-ditions are not irreconcilable, and the writer has suc-ceeded experimentally on two engines in obtaining thewhole range from dead light to full load by controllingthe fuel alone. Under these circumstances not only isthe efficiency on reduced loads far higher than could beobtaine
. Automotive industries . til after igni-tion. To do this it is necessary to reconcile two conflict-ing conditions—the two portions of the charge must beprevented from mixing till after ignition, and at the sametime there must be sufficient turbulence in the combus-tible charge to insure rapid combustion. These two con-ditions are not irreconcilable, and the writer has suc-ceeded experimentally on two engines in obtaining thewhole range from dead light to full load by controllingthe fuel alone. Under these circumstances not only isthe efficiency on reduced loads far higher than could beobtained by any other means, but the heat loss is so lowthat a water-cooled engine can be run at reduced loadsfor any length of time without cooling water. The accompanying curve (Fig. 7) shows the efficiencyactually obtained in one experimental engine with a com-pression ratio of only 5:1. It will be observed that itrises to no less than 37 per cent at about one-third fullload corresponding to a fuel consumption of just under. Fig. 8—Indicator card from experimental engine using excessair pint of benzol per indicated horsepower-hour. It will be seen that the curve of efficiency actually obtainedfollows the theoretical curve with a reasonable degreeof approximation. In Fig. 8 is shown a typical indicatordiagram taken from one of the two engines with a Hop-kinson optical indicator. It should be noted that whenworking on this system distribution troubles any ordinary multi-cylinder engine it is necessaryso to proportion the mixture that the weakest cylinderreceives a charge of a certain minimum strength to in-sure regular running; this means that other cylindersare receiving a slightly richer charge than is absolutely February 21, 1921 AUTOMOTIVE INDUSTRIES THE AUTOMOBILE 461 necessary and their efficiency is therefore reduced. Onthe other hand, when working with a stratified charge,the power output of each cylinder is dependent solelyupon the quality of fuel admit
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectaeronautics, bookyear
