ENGINE TUNING DATA 18V 581Y,18V 582Y, AND 18V 583Y ENGINES ENGINE Type Displacement Firing order . . Compression ratio: H.C. L.C. Cranking pressure Idle speed . . . . . . . . Valve rocker clearance: Set cold Set hot Static ignition timing: H.C. L.C. Stroboscopic ignition timing: H.C. L.C. Timing mark location DISTRIBUTOR Make/Type Contact breaker gap Contact spring tension Rotation of rotor Dwell angle Centrifugal advance Crankshaft degrees/Speed (vacuum pipe disconnected) Vacuum advance Starts Finishes . . Total crankshaft degrees IGNITION COIL Make/Type Resistance: Primary SPARKING PLUGS Make/Type Gap CARBURETTERS Make/Type Jet . . Needle Piston spring ELECTRICAL Alternator . . Battery Volts/Polarity Starter MGB. Issue 2. 83910 71 18V. 109-8 cu. in. (1798 0.0.). 1, 3, 4, 2. 9-0 : 1. 8-0 : 1. Nominal 170 lbf./sq. in. (1 1-95 kgf./cm.2) at 275 r.p.m. 750 to 800 r.p.m. -015 in. {-38 mm). -013 in. (-33 mm). 10 B.T.D.C. 10 B.T.D.C. 13 B.T.D.C. at 600 r.p.m. 13 B.T.D.C. at 600 r.p.m. Pointer on timing case, notch on crankshaft pulley. Lucas/25D4. -014 to -016 in. (~35 to -40 mm). 18 to 24 oz. (510 to 680 gm.). Anti-clockwise. 60i3. Serial number Serial number 41288 (H.C.) 41290 (LC) 0 to 6 at 600 r.p.m. 0 to 6 at 600 r.p.m. 4 to 9 at 700 r.p.m. 6 to 10 at 800 r.p.m. 7 to 11 at 900 r.p.m. 7 to 11 at 1,000 r.p.m. 13 to 17 at 1,600 r.p.m. 16 to 20 at 3,000 r.p.m. 18 to 22 at 2,200 r.p.m. 22 to 26 at 4,400 r.p.m. 5 in. Hg 4 in. Hg (127 mm. Hg). (101-6 mm. Hg). 13 in. Hg 12 in. Hg (330-2 mm. Hg). (304-8 mm. Hg). 20:[:2. 16i2. Lucas/HA12. 3-1 to 3-5 ohms at 20 C. (68 F.). Champion/N9Y. -024 to -026 (625 to -66 mm.). S.U./HIF4. -090 in. (2-2 mm.). AAU. Red. Lucas 16ACR. Lucas BT9E, BTZ9E, CA9E, SG9E or Exide 3XCK9L. 12 volt/NEGATIVE earth. Lucas 2M100 Pre-engaged. Engine Tuning Data 5