The selection of the fuel-air ratio is therefore very important both for engine performance and for The stoichiometric mixture ratio depends on the kind of fuel used, so if the fuel is changed, thisįuel-air ratio will also change (see SECTION 5.1). about 14.5 - 15.0 kgs of air to 1 kg of petrol.Ī stoichiometric mixture ratio is one which ensures complete combustion of fuel with only the To obtain optimum combustion between these inflammability limits, a value very close to the so-Ĭalled stoichiometric value is needed ie. 7 kgs of air and 1 kg of petrol),ĭown to 20:1 (lean limit ie. Lnflammmability limits for commercial petrol are: 7:1 (rich limit ie. Of inflammability so that the mixture can be easily ignited by the spark in the combustion chamber. In weight mixed with a fuel unit of weight, must have a precise value, ie. We have spoken of a "proper" mixture because the mixture strength, defined as the amount of air Or at least by atomising it into very small droplets.Ītomization takes place in this way: liquid fuel from the atomiser nozzle meets the flow of air whichĬarries it, broken into very fine droplets, to the combustion chamber. The fuel-air mixture is formed through vaporising and by uniformly spraying fuel into the airstream To supply the engine with varying amounts of this mixture To form a proper homogeneous inflammable mixture of fuel and air 20ĥ.2 Changes in atmospheric pressure and in air temperature. 17ģ.7.2 Selection of correct pump jet and slide pump cam. 15ģ.6.5 Selection of the correct size of main jet. 15ģ.6.4 - Selection of the tapered needle. Full-Throttle system as usually used on 4-Stroke engines (also on 2-Stroke engines in special applications). 13ģ.6.1 Full-throttle system usually used on two-stroke engines. 12ģ.4.3 - Selection of the correct size of idle jet. 11ģ.4.2 - Idle Setting with an air-adjusting screw. 11ģ.4.1 - Idle setting with a mixture-adjusting screw. 9ģ.3.3 - The flooding-plunger cold starting device. Selection of emulsion starter tube and starter jet. 7ģ.2.1 Selection of the needle valve size. 6ģ.1.1 Selection of the correct Carburetor choke size. 5ģ OPERATION, SELECTION OF CORRECT PARTS, TUNING AND USE. Ģ.1 Carburettor diagram and principal parts. Reproduced or transmitted in any form or by any means without the written permission of the Author.ġ FUNCTIONS OF THE CARBURETTOR. No part of the contents of this document may be Copyright © 2001 - 2008 by John Savage - All rights reserved.
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