AP Racing Catalogue Issue 4

114 visit www.apracing.com for installation drawings & up to date product range details FIXING / MOUNTING STUDS. The recommended method of mounting the clutch to the flywheel is with a mounting stud and K-Lock nut. The recommended tightening torque is 22Nm (16lb/ft) for M8 & 5/16” UNF. AP Racing offer a range, of studs for mounting clutches to flywheels, (see page 120). These high quality steel mounting studs are available in either M6, M8, 1/4” & 5/16” UNF to suit clutches of Ø115mm, and above. All studs have rolled threads for improved fatigue resistance. The stud design incorporates offset head flats for location, necked down shanks and precision ground location diameters. All kits come complete with relevant K-lock nuts. See above for flywheel mounting details. FLYWHEELS. A purpose machined flywheel is required. The friction face should be a good quality close grained cast iron or steel (0.35 / 0.45 % carbon, hardness 200Hb minimum), with a surface finish of 75µm RA (30 CLA) maximum. Run out when assembled to the crankshaft must not exceed 0.08mm (0.003”) maximumat 76mm (3.0”) radius. Fixing holes and location spigot to be machined as shown above. N.B. Cast Iron flywheels should not be used above 10000rpm. MOUNTING The drawings below, provide detailed information for all flywheel spigots / mounting for every size of race clutch in the publication. AP Racing recommend that all their race clutches are mounted to the flywheel by using either CP4703 / CP4702 studs. Mounting hole, P.C.D., and tightening torque details are given for all drawings below. 6 / 8 MOUNTING HOLES. EQUI-SPACED ON A P.C.D AS FOR STUDS THREAD M8 OR 5/16UNF NB C’BORED THR’DTIGHTENING TORQUE 22.0Nm (16lb/ft) F/WHEEL DIMN Ø AS FOR STUDS 2.54 2.46 ALTERNATIVE FIXING USING BOLT FOR 140MM - 215MM STEPPED FLYWHEEL METALLIC RACE CLUTCH - Mounting Information