96 visit www.apracing.com for installation drawings & up to date product range details INTRODUCTION For many yearsAP Racing has been the world leader in the design and manufacture of metallic,competition clutch systems. This section combines all sizes of Sintered and Cerametallic race clutches. The clutches 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 116. Other splines can also be accom- modated, please contact AP Racing 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, fromAP Racing. If your clutch requirements fall outside these examples, please contact AP Racing technical department, 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:- Primarily 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 / Ø215mm (8½“). A larger diameter increases torque capacity, & reduces wear, but increases inertia. ◘ MOMENT OF INERTIA:- Rotatingmass 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, cerametallic’s 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 (109lbsft) to 1272Nm (938lbsft) and for breakaway torque up to 1610Nm (1187lbsft). - 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. Standard Ø184mm clutch covers, are machined from high quality aluminium alloy castings, whereas, ‘I’ Drive & ‘DB’ clutch covers, are made from one piece forgings. 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 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 Sintered / Organic Lug 6 HiR CP8022 184 (I Drive) 2 Push Sintered Lug 6 EHR CP8742 2 Push Cerametallic Lug 12 HiR CP8842 184 2 Push Cerametallic Lug 6 EHR CP8732 184 Dual Banded 2 Push Cerametallic Lug 12 EHR or HiR CP3745 200 1 Push Cerametallic Lug 6 HiR CP3871 200 1 Push Cerametallic Lug 6 HiR CP3921 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 NEW TECHNOLOGIES ‘DB’ Dual Banded A new direction in clutch design. ‘DB’ Dual Banded cover design, offers patented concentric dual banded stiffening features within the cover, providing significant reduction in weight, and increased stiffness, compared to conventional clutches. ‘DB’ clutches benefit from the same optimised software used in Radi-CAL™ brake technology. AP Racing plan to roll this feature out to many existing clutch families, enabling other race series to benefit from this optimised technology. ‘I’ Drive Clutch System AP Racing has continued to develop its ‘I’ Drive clutch range with the System offering the following ben- efits. Whilst conventional clutch designs typically feature external ‘jaws’ around the outer edges of the steel intermediate 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 mo- mentum. The ‘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 alumini- um cover drive-legs, which provide robust wear surfaces. ‘I’ Drive is al- ready in competitive use, with Ø184mm (7¼”) units running in WRC and Ø140mm (5½”) units running in endurance and touring car applications. STANDARD RACE CLUTCH FEATURES ◘ Individually tested - Match machined, balanced, clutch load and function. ◘ For lug types only - One piece cover and lugs - Machined from ,billet. Provides rigidity, strength, and cooler running. Allows dust and debris to escape. ◘ Lightweight and durable. ◘ Low wear rate. ◘ Black hard anodised surface treatment on covers.