{"product_id":"act-hd-rigid-race-clutch-kits-1989-1991-civic-crx","title":"ACT HD Rigid Race Clutch Kits for 1989-1991 Civic\/CRX","description":"\u003cul\u003e\n\u003cli\u003eChoice of four-pad or six-pad rigid ceramic race disc \u003c\/li\u003e\n\u003cli\u003eH023 Heavy Duty pressure plate in both kits \u003c\/li\u003e\n\u003cli\u003e300 lb-ft engine\/crank torque capacity per ACT \u003c\/li\u003e\n\u003cli\u003e212 mm disc with 7\/8-inch, 20-spline hub \u003c\/li\u003e\n\u003cli\u003eIncludes RB427 release bearing, PB1002 pilot bearing and AT20 alignment tool \u003c\/li\u003e\n\u003cli\u003e1990-1991 SOHC D-series Civic\/CRX, excluding 4WD; 1989 requires flywheel upgrade \u003c\/li\u003e\n\u003cli\u003eACT recommends race use only; aggressive engagement and increased gear rattle \u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003c!-- split --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli\u003e\u003ca class=\"active\" href=\"#Description\"\u003eDescription\u003c\/a\u003e\u003c\/li\u003e\n \u003cli\u003e\u003ca href=\"#VehicleFitment\"\u003eVehicle Fitment\u003c\/a\u003e\u003c\/li\u003e \u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\n\n\u003cli class=\"active\" id=\"Description\"\u003e\n\u003ch3\u003eACT HD Rigid Race Clutch Kits: HC4-HDR4 and HC4-HDR6\u003c\/h3\u003e\n\u003cp\u003eIf you're putting a race clutch in your D-series Civic or CRX, these are ACT's four-pad and six-pad rigid-disc kits with the H023 Heavy Duty plate. Both are 212 mm and rated at 300 lb-ft at the crank. You'll use them for the 1990-1991 manual-transmission application; on a 1989 car, you'll need the flywheel change below as well. Neither kit is for a 4WD application.\u003c\/p\u003e\n\u003ch3\u003eChoose the disc for the way you'll use the car\u003c\/h3\u003e\n\u003cp\u003eACT recommends both kits for race use only. You'll have the aggressive engagement and increased gear rattle that ACT lists with its rigid race discs. The light-to-moderate pedal effort doesn't change that takeup. If you're after something you can bring in gently on a road car, you'll want to compare ACT's street-disc kits before choosing one of these.\u003c\/p\u003e\n\u003cp\u003eYou're choosing ceramic friction pads here for heat tolerance. ACT makes the hub from heat-treated chrome-moly, and there's no spring pack in the center. You'll give up the damping of a spring-centered disc with that rigid construction. ACT rates friction life as moderate and notes that spline wear may increase. Those are part of the choice, along with how you'd like the clutch to engage.\u003c\/p\u003e\n\u003cp\u003eYou'll get H023 with either disc. ACT uses a stamped cover for rigidity and puts the diaphragm through four stages of heat treatment. Its diaphragm design increases clamp load and reduces deflection. So when you switch the option from four pads to six, you're choosing another disc layout with the same pressure plate.\u003c\/p\u003e\n\u003cp\u003eWith the rigid hub, you may hear more gear rattle. ACT describes a light knock or growl while you're idling in neutral, particularly after a long drive. A spring-centered disc dampens the engine's torsional pulses; you're giving up that damping here, so more of the gear-tooth impacts can be heard. If the car shudders as you engage the clutch, that's chatter rather than the noise ACT is describing. An unfamiliar sound still needs checking on the car.\u003c\/p\u003e\n\u003ch3\u003eAvailable options\u003c\/h3\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOption\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eSKU \/ kit MPN\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eIncluded disc\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e4 Pad\u003c\/td\u003e\n\u003ctd\u003eactHC4-HDR4 \/ HC4-HDR4\u003c\/td\u003e\n\u003ctd\u003e4212004\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e6 Pad\u003c\/td\u003e\n\u003ctd\u003eactHC4-HDR6 \/ HC4-HDR6\u003c\/td\u003e\n\u003ctd\u003e6212004\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cp\u003eHC4-HDR4 gives you disc 4212004; HC4-HDR6 gives you 6212004. ACT describes its four-pad design as suited to smaller discs and engines, and its six-pad design as suited to larger clutch sizes where heat absorption is useful. On your Civic\/CRX, though, you'll have the same 212 mm diameter and 300 lb-ft rating either way. Don't buy six pads expecting a larger clutch or a higher listed torque capacity.\u003c\/p\u003e\n\u003ch3\u003eSpecifications and kit contents\u003c\/h3\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eDisc material and hub\u003c\/td\u003e\n\u003ctd\u003eCeramic pads; rigid, heat-treated chrome-moly hub\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDisc diameter\u003c\/td\u003e\n\u003ctd\u003e212 mm \/ 8.3 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput shaft\u003c\/td\u003e\n\u003ctd\u003e7\/8 in, 20 splines\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTorque capacity\u003c\/td\u003e\n\u003ctd\u003e300 lb-ft at engine\/crank, per ACT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePressure plate\u003c\/td\u003e\n\u003ctd\u003eH023 Heavy Duty\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRelease bearing\u003c\/td\u003e\n\u003ctd\u003eRB427\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePilot bearing\u003c\/td\u003e\n\u003ctd\u003ePB1002\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAlignment tool\u003c\/td\u003e\n\u003ctd\u003eAT20\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cp\u003eYou'll get one pressure plate, your selected disc, the release bearing, pilot bearing and alignment tool. You'll supply the flywheel separately. ACT's torque figure is measured at the engine, so compare it with engine torque, not a horsepower figure.\u003c\/p\u003e\n\u003ch3\u003eFitment and the 1989 conversion\u003c\/h3\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eYear\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eMake \/ model\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eApplication\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1990-1991\u003c\/td\u003e\n\u003ctd\u003eHonda Civic \/ CRX\u003c\/td\u003e\n\u003ctd\u003e1.5L or 1.6L SOHC D-series manual; excludes 4WD; 212 mm clutch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1989\u003c\/td\u003e\n\u003ctd\u003eHonda Civic \/ CRX\u003c\/td\u003e\n\u003ctd\u003eConditional 212 mm upgrade for 1.5L or 1.6L SOHC D-series manual; excludes 4WD\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cp\u003eIf your 1989 CRX still has its original 200 mm flywheel, you'll need to change it to use this 212 mm kit. ACT specifies a 1990-2001 Civic SOHC flywheel or the appropriate ACT flywheel for that upgrade. The same applies to a 1989 Civic. If you've bought a car with a swap or a previous clutch conversion, check the transmission and flywheel that's in it before ordering by chassis year.\u003c\/p\u003e\n\u003cp\u003eIf you've also got HC5 on your shortlist, check the release bearing before treating it as the same kit. You'll find RB427 in HC4 and RB820 in HC5. The plate and disc numbers can match across those families, but the bearing needs to suit your release system.\u003c\/p\u003e\n\u003ch3\u003eBefore fitting the new clutch\u003c\/h3\u003e\n\u003cp\u003eYou've got access to the cable, fork, pivots, guide tube and seals with the gearbox out. Check them before you put the new clutch in. If you've found a leak, fix it first: oil on the friction faces can cause slip or judder. ACT calls for replacing a cracked flywheel. If you're having yours resurfaced, use a professional shop and make sure it keeps the correct step height.\u003c\/p\u003e\n\u003cp\u003eTry the disc on the input shaft to check its fit and movement. Use the light coat of spline grease ACT specifies, then wipe off the excess. You're keeping that grease away from the friction faces. Have Honda's procedure and ACT's instructions to hand for assembly and the release adjustment.\u003c\/p\u003e\n\u003cp\u003eYou'll need ACT's race-disc break-in guidance for these discs. ACT describes a few hard slips to lap the surfaces, without overheating them. Its 300-500-mile recommendation is for organic street discs, so don't carry that mileage advice over to this kit.\u003c\/p\u003e\n\u003ch3\u003eWarranty\u003c\/h3\u003e\n\u003cp\u003eYou'll have ACT's listed 12-month limited warranty for material and workmanship defects. Keep the receipt from your authorized dealer with the kit's paperwork. You'll need it for a claim, and you'll want to check the current terms before returning parts. ACT excludes labor charges.\u003c\/p\u003e\n\u003c\/li\u003e\n\n \n\u003cli id=\"VehicleFitment\"\u003e\n \u003cp\u003eSOHC D-series manual-transmission applications only; excludes 4WD and engine\/transmission swaps not matching this assembly. ALL 1989 rows are conditional: replace the original 200 mm flywheel with a compatible 1990-2001 Civic SOHC flywheel or appropriate ACT flywheel for this 212 mm clutch. Flywheel is not included.\u003c\/p\u003e \n\u003c\/li\u003e\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\u003c\/ul\u003e\n","brand":"ACT Clutch","offers":[{"title":"4 Pad","offer_id":67633399955490,"sku":"ACTHC4-HDR4","price":445.0,"currency_code":"USD","in_stock":false},{"title":"6 Pad","offer_id":67633399988258,"sku":"ACTHC4-HDR6","price":471.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2218\/5701\/files\/act-hd-rigid-race-clutch-kits_a00y.jpg?v=1790899028","url":"https:\/\/www.hybrid-racing.com\/products\/act-hd-rigid-race-clutch-kits-1989-1991-civic-crx","provider":"Hybrid Racing","version":"1.0","type":"link"}