104 Visit www.apracing.com for full & up to date product range INTRODUCTION. For many years AP Racing has been the world leader in the design and manufacture of competition clutch systems. This section combines all sizes of Sintered and Cerametallic Race Clutches. The clutches in this section are designated Sintered or Cerametallic, sometimes called “Paddle” clutches, this refers to the type of driven plate that is used in the clutch. Both types of driven plate are available with a comprehensive range of spline sizes to suit a wide range of popular applications. A list of standard spline sizes can be found on page 136. Other splines can also be accommodated, please refer toAPRacing for details. This section also provides guidance & general information on clutch selection, types of driven plate and friction materials, plus basic technical information and installation details for each clutch. RACE CLUTCH RANGE DETAILS. The table below provides quick reference information on the range of Race Clutches available from AP Racing. If your clutch requirements fall outside these examples, please contact AP Racing Technical Section who will be pleased to discuss your specific application. SINTERED OR CERAMETALLIC ?. This information will aid the selection process in deciding whether a Sintered or Cerametallic Clutch assembly should be used. ◘ SINTERED: - Primary used in race applications. / - Compact installation. / - Low inertia. / - Lightweight. ◘ CERAMETALLIC: - Primarily used in rally / off road applications. / - Resistant to high energy input (i.e. long slip) / - Smoother engagement. / - Less prone to judder. Note : Whilst it is recommended that Sintered Clutches are suitable for Race applications and Cerametallic Clutches for Rally or Off Road applications, both types are often used successfully in other area’s. ◘ DIAMETER:- There are five diameters to choose from :- Ø115mm (4½“), Ø140mm (5½“), Ø184mm (7¼“), Ø200mm and Ø215mm (8½“). A larger diameter increases torque capacity & reduces wear but increases inertia. ◘ MOMENT OF INERTIA:- Rotating mass around the axis of clutch. Lower moment of inertia will result in faster engine response and gear changes. ◘ CLUTCH CONFIGURATION: - There are two basic designs for both the Sintered and Cerametallic clutches, the traditional A-Ring type with an adaptor ring and separate cover or a cover with integral legs (Lug type). The lug drive design allows friction dust to escape and reduces heat build up particularly when used with cerametallic drive plates. Sintered clutches are available in 1, 2, 3 and 4 plate versions, Cerametallics are available in both 1 and 2 plate versions. The dynamic torque capacity of each clutch depends upon the type of friction material, the number of driven plates, which diaphragm spring is fitted and the pressure plate ratio. A choice of springs is available, suitable for engine torques ranging from 148Nm (109lbs/ft) to 1272Nm (938lbs/ft) and for breakaway torque up to 1610Nm (1187lbs/ft). ◘ COVERS - LUG TYPE:- The Lug Drive Sintered Clutch range utilises a one piece Aluminium Alloy cover and lug design which has a , low moment of inertia and runs cooler. All Ø115mm, Ø140mm and Ø200mm clutch covers are machined from billet. Ø184mm Clutch covers are machined form a high quality aluminium alloy casting. - ‘A’ RING TYPE:- The ‘A’ Ring Clutch type is only available in Ø184mm diameter. Push types are available with either a steel or aluminium alloy cover (functionally there is no difference between the steel and aluminium alloy cover) however, the aluminium alloy cover assembly gives a weight saving of approximately 300g over the steel version and has lower inertia. ◘ NUMBER OF DRIVEN PLATES:- The number of plates re- quired for an application will depend on engine torque, clutch diam- eter and clamp load. Generally a smaller diameter clutch will re- quire more plates than a larger diameter unit. A Comprehensive range of splines is available to suit most transmission input shafts. Details on page 136. If the spline required is not in this table please contact AP Racing Technical Section. Clutch Series No. Clutch Description. Clutch Ø (mm) No. of Driven Plates Clutch Actuation Type. Sintered / Cerametallic. Drive Type. No. Of Fixing Bolts. Press/ Plate Ratio. CP6073 115 3 Push Sintered Lug 10 EHR CP6074 115 4 Push Sintered Lug 10 EHR CP6001 140 1 Push Sintered Lug 8 HiR CP6002 140 2 Push Sintered Lug 8 HiR CP6003 140 3 Push Sintered Lug 8 HiR CP6092 140 2 Push Bonded Lug 8 HiR CP6013 140 3 Push Sintered Lug 8 HiR CP6014 140 4 Push Sintered Lug 8 HiR CP8773 140 (I Drive) 3 Push Sintered Lug 12 EHR or HiR CP8804 140 (I Drive) 4 Pull Sintered Lug 12 HiR CP2116 184 1 Push Sintered A Ring 6 HiR CP7371 184 1 Push Sintered Lug 6 EHR CP7381 184 1 Push Cerametallic Lug 6 EHR CP2125 184 2 Push Sintered A Ring 6 HiR CP2606 184 2 Push Cerametallic A Ring 6 HiR CP7372 184 2 Push Sintered Lug 6 EHR CP7382 184 2 Push Cerametallic Lug 6 HiR CP7392 184 2 Push Cerametallic Lug 6 HiR CP7972 184 2 Push Cerametallic Lug 6 HiR CP2817 184 3 Push Sintered A Ring 12 HiR CP7373 184 3 Push Sintered Lug 6 EHR CP7383 184 3 Push Sinterd / Organic Lug 6 HiR CP8022 184 (I Drive) 2 Push Sintered Lug 6 EHR CP3745 200 1 Push Cerametallic Lug 6 HiR CP3871 200 1 Push Cerametallic Lug 6 HiR CP4560 200 1 Push Cerametallic Lug 6 HiR CP5241 215 1 Push Cerametallic Lug 6 LoR CP5242 215 2 Push Cerametallic Lug 6 LoR METALLIC RACE CLUTCH - General Information ‘I’ Drive Clutch System AP Racing has developed a new design of clutch. Whilst conven- tional clutch designs typically feature external ‘jaws’ around the outer edges of the steel interme- diate and main pressure plates, which can distort trapping the legs of the aluminium cover and cause the clutch to drag. The ‘I’ Drive design features drive tenons, which locate into internal jaws in the lightweight aluminium clutch cover, eradicating the onset of clutch drag. The ‘ I’ Drive design has been proven via a program of extensive dyno tests which assessed durability in challenging conditions. During the test the ‘I’ Drive clutch maintained optimum performance under arduous operating conditions for significantly longer than the conventional clutch design. Our research shows the new clutch design to be five times more durable when subjected to the same test parameters. With up to 10% less mass than conventional clutches, and with 15% less rotational momentum, ‘I’ Drive design also features an innovative ‘wear plate’, to combat wear on the drive legs of the lightweight aluminium clutch cover, where they interact with the steel plates. This problem, common to all sintered clutches with aluminium covers, is reduced by the use of thick wear ‘pads’ held captive on the drive faces of each of the aluminium cover drive-legs, which provide robust wear surfaces. ‘I’ Drive is already in competitive use, with Ø184mm (7¼”) units running in WRC and Ø140mm (5½”) units running in endurance and touring car applications. This is part of a programme of continuous improvement for the ‘I’ Drive design with the aim of introducing different variations in the future.