Brantford "Ideal" gas and gasoline engines : instruction book . rely the use of too much lubri-cating oil. COMPRESSION. In securing efficiency and economy, the compression of the charge is an important factor. Care shouldtherefore always be taken to see that valves seat properly, and that cylinder rings, etc., are in proper condition. The compression stroke of the engine is that following the inlet or charging stroke, and is very notice-able when turning the engine by hand; wuh the relief ccck closed it will be found difficult to force the pistonback on that stroke. If, when turning the wheels
Brantford "Ideal" gas and gasoline engines : instruction book . rely the use of too much lubri-cating oil. COMPRESSION. In securing efficiency and economy, the compression of the charge is an important factor. Care shouldtherefore always be taken to see that valves seat properly, and that cylinder rings, etc., are in proper condition. The compression stroke of the engine is that following the inlet or charging stroke, and is very notice-able when turning the engine by hand; wuh the relief ccck closed it will be found difficult to force the pistonback on that stroke. If, when turning the wheels by hand, they should be found to revolve easily through the entire cycleof two revolutions, that is, without the resistance that should be made by the compression, the cause should beimmediately located, since it is impossible to start or operate the engine in such a condition. On a new engine, the trouble is generally caused by the air valve sticking or the exhaust valve seating improperly onaccount of the accumulation during transit of dust or sediment. 17. FIG. 8.— IDEAL IGNITER, SHOWING VARIOUS PARTS. 18 IGNITER. The arrangement by which the electric spark is made in our engines is called the igniter. This consists of a cast-iron plug containing two electrodes or sparking points, one movable, the otherstationary. Both of these electrodes are fitted with platinum rings at their point of contact. The igniteris fitted into the cylinder with the electrodes extending into the combustion chamber, and is heid in its place—which is a ground joint seat and needs no packing—by three screws. The arrangement and detail of the igniter may be studied from the cut of same (Fig. 8, page 18.) The stationary electrode No. 13 consists of a large steel post which runs completely through the igniterand is held in position by means of a brass washer and nut. It is insulated from the metal of the igniter bymeans of mica washers, No. 15. The movableelectrode consists of a short steel pest,
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