3 32 4 4 5 5 6 6 7 72 8 Stroke in inches. Advance in degrees. Fig 136.-Bosch Chart for Determining Advance with Various Piston Strokes. ber 3 is coupled to the plug in cylinder 4, and the segment 4 is connected to the plug in cylinder 3, which is thus the last to fire if the explosion takes place first in cylinder 1. The direction of the distributor brush rotation, if driven by the usual form of gearing, is opposite to that of the magneto armature. Obviously, if one cylinder is timed correctly, the remaining members will also fire at the proper time in the cycle of operations. The positions of the armature, distributing brush, contact breaker cam and Fig. 137.-Explaining Method of Timing Splitdorf Magneto. engine piston are easily ascertained by inspection of drawing. The methods of timing Splitdorf magnetos are shown at Fig. 137. Firing Order of Typical Engines.-The following information relative to timing of leading 1914 and 1915 models of American manufacture will prove of great value to the repairman called upon to repair many different makes of cars. It is well to remember, if the firing order is not known, that it can be easily determined by following the inlet valve movements in the cylinders and noting the order of opening of these members. ABBOTT-DETROIT. 34-40 AND 44-50-FIRING ORDER 1-3-4-2. BELLE ISLE-FIRING ORDER 1-5-3-6-2-4. Contact Magneto Setting-Piston dead centre, lever fully retarded. Full advance, spark occurs with crankshaft 13 degrees ahead of dead centre. point gap .018 inch. ALLEN. 40-FIRING ORDER 1-2-4-3. Magneto Setting-Piston top dead centre, lever fully retarded. AMERICAN. SCOUT-FIRING ORDER 1-3-4-2. 644, 646 AND 666-FIRING ORDER 1-5-3-6-2-4. Magneto Setting-Three-quarter inch after dead centre on flywheel. ARBENZ. FIRING ORDER 1-3-4-2. Magneto Setting-Piston .03125 inch late, lever fully retarded. AUBURN. 4-40 AND 4-41-FIRING ORDER 1-3-4-2. Magneto Setting—Piston .03125 inch late, lever fully retarded. 6-46 AND 6-45-FIRING ORDER 1-4-2-6-3-5. Magneto Setting-Piston top dead centre, lever fully retarded. BUICK. B 24, 25, 36, 37 AND 38-FIRING ORDER 1-3-4-2. Delco-With timer cam fully retarded, spark occurs 40 degrees past upper dead centre on firing stroke. With hand spark lever half-way ad vanced, spark occurs at approximately top dead centre. B 55-FIRING ORDER 1-4-2-6-3-5. Delco-Piston dead centre with timer fully retarded. CASE. 25 R AND 35 S-FIRING ORDER 1-3-4-2. Magneto Setting-One thirty-second inch before top dead centre. 40 0-FIRING ORDER 1-3-4-2. Magneto Setting-One-sixteenth inch after top dead centre. CHALMERS. 24-FIRING ORDER 1-4-2-6-3-5. Magneto Setting-One and one-half inches past centre, lever fully retarded. CHANDLER. SIX-FIRING ORDER 1-5-3-6-2-4. Magneto Setting-Piston dead centre, lever fully retarded. COLE. FOUR-FIRING ORDER 1-3-4-2. SIX-FIRING ORDER 1-5-3-6-2-4. Delco-Piston dead centre, distributor fully retarded. CONTINENTAL. 27-FIRING ORDER 1-3-4-2. Magneto Setting-Three-quarter inch after dead centre on flywheel. GLIDE. 36 AND 30-FIRING ORDER 1-3-4-2. Westinghouse-Piston top dead centre. GRANT. M-FIRING ORDER 1-3-4-2. Magneto Setting-Lever fully advanced, piston .3125 inch before top dead centre. HAYNES. 28-FIRING ORDER 1-3-4-2. Magneto Setting-One sixty-fourth inch advanced on down stroke. 26 AND 27-FIRING ORDER 1-4-2-6-3-5. Magneto Setting-One sixty-fourth inch advanced on down stroke. |