{"product_id":"brian-crower-honda-acura-k20a-k20z-k24a2-stage-2-camshafts","title":"Brian Crower Honda\/Acura K20A\/K20Z\/K24A2 Stage 2 Camshafts","description":"\u003cul\u003e\n\u003cli\u003eStage 2 Camshafts \u003c\/li\u003e\n\u003cli\u003eCompatible with Naturally Aspirated or Forced Induction Vehicles \u003c\/li\u003e\n\u003cli\u003eRequires Upgraded Supporting Valvetrain Mods \u003c\/li\u003e\n\u003cli\u003eFits K20A, K20Z3, K24A2 Engines \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  \u003cli\u003e\u003ca href=\"#TechnicalData\"\u003eTechnical Data\u003c\/a\u003e\u003c\/li\u003e   \u003cli\u003e\u003ca href=\"#Included\"\u003eIncluded\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\u003eBrian Crower Stage 2 Camshafts - K20A \/ K20Z \/ K24A2\u003c\/h3\u003e\n\n\u003cp\u003eCamshafts are where a K-series build stops being bolt-ons and starts being an engine. Brian Crower's Stage 2 profiles are machined from 8620 billet and come in two versions, one for naturally aspirated builds and one for forced induction, because those two applications want opposite things from a cam. Pick the right one and this is where the power you've been chasing finally shows up.\u003c\/p\u003e\n\n\u003ch4\u003eYou Need Valve Springs, No Exceptions\u003c\/h4\u003e\n\n\u003cp\u003eMost important thing on this page, so read it before anything else.\u003c\/p\u003e\n\n\u003cp\u003eThese cams require \u003cstrong\u003eBrian Crower kit BC0040 or BC0040S\u003c\/strong\u003e, which supplies dual valve springs, retainers, and seats. That's a hard requirement, not a recommendation.\u003c\/p\u003e\n\n\u003cp\u003eHere's why it matters. Higher lift and more aggressive ramps ask considerably more of your valve springs than the factory profile does. Run these on stock springs and you get valve float at rpm, which means the valve doesn't close when it should. On an interference engine, that's a piston meeting a valve.\u003c\/p\u003e\n\n\u003cp\u003e\u003ca href=\"https:\/\/www.hybrid-racing.com\/products\/supertech-55mm-7-valve-keepers-for-hondaacura-32-pack?_pos=1\u0026amp;_sid=9ada4799b\u0026amp;_ss=r\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eUpgraded valve keepers\u003c\/a\u003e are also recommended while you're in there, since the retainer and keeper interface sees the same increased loads.\u003c\/p\u003e\n\n\u003cp\u003eBudget for the spring kit as part of this purchase rather than a later addition. A set of cams without the valvetrain to support them is an expensive way to hurt an engine.\u003c\/p\u003e\n\n\u003ch4\u003eNaturally Aspirated Or Forced Induction?\u003c\/h4\u003e\n\n\u003cp\u003eThese are genuinely different profiles solving different problems. Pick based on your build, not on which numbers look bigger.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eNaturally aspirated (BC0042-2)\u003c\/strong\u003e runs 304°\/300° advertised duration, 234°\/228° at .050\", and .525\"\/.472\" lift. This is for high compression all-motor builds at 11.5:1 or above, and it also works on high boost setups running 18 psi or more. Pair it with a cold air intake, header, exhaust, ECU tuning, and fuel work to actually use it.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eForced induction (BC0041-2)\u003c\/strong\u003e runs 296°\/300° advertised, 222°\/224° at .050\", and .520\"\/.497\" lift. Shorter duration on the intake side reduces overlap, which builds cylinder pressure, while the high lift keeps air moving. That's exactly what a turbo or supercharged engine wants.\u003c\/p\u003e\n\n\u003ch4\u003eWhy Boost Wants Less Duration\u003c\/h4\u003e\n\n\u003cp\u003eWorth understanding, because it's counterintuitive if you're used to naturally aspirated thinking.\u003c\/p\u003e\n\n\u003cp\u003eOn an all-motor engine, overlap is your friend. Exhaust gas leaving at speed helps pull the intake charge in, and more duration and overlap is how you take advantage of that scavenging effect.\u003c\/p\u003e\n\n\u003cp\u003eOn a boosted engine you've got a turbo forcing air in, so you don't need scavenging to fill the cylinder. What overlap does instead is let boost pressure blow straight out the exhaust valve while both are open, which wastes air and hurts cylinder pressure.\u003c\/p\u003e\n\n\u003cp\u003eThat's why the forced induction cam runs shorter duration. You're keeping the valves closed longer to hold pressure, while the high lift makes sure you're still flowing plenty of air when they are open. A big-duration NA cam on a boosted motor usually makes less power, not more.\u003c\/p\u003e\n\n\u003ch4\u003eStreet Manners Aren't Sacrificed\u003c\/h4\u003e\n\n\u003cp\u003eThe concern with any cam upgrade is turning the car into something you can't drive, and Brian Crower designed Stage 2 specifically to avoid that.\u003c\/p\u003e\n\n\u003cp\u003eThese deliver excellent street manners and idle quality despite the increase in lift and duration. The car still idles properly, still behaves in traffic, and still starts and drives like a car. That's a real engineering achievement on a cam this aggressive, and it's what separates Stage 2 from going further up the range.\u003c\/p\u003e\n\n\u003ch4\u003eSpecifications\u003c\/h4\u003e\n\n\u003ctable\u003e\n    \u003cthead\u003e\n        \u003ctr\u003e\n            \u003cth scope=\"col\"\u003e\u003cbr\u003e\u003c\/th\u003e\n            \u003cth scope=\"col\"\u003eNaturally Aspirated\u003c\/th\u003e\n            \u003cth scope=\"col\"\u003eForced Induction\u003c\/th\u003e\n        \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n        \u003ctr\u003e\n\u003ctd\u003ePart number\u003c\/td\u003e\n\u003ctd\u003eBC0042-2\u003c\/td\u003e\n\u003ctd\u003eBC0041-2\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eAdvertised duration\u003c\/td\u003e\n\u003ctd\u003e304° \/ 300°\u003c\/td\u003e\n\u003ctd\u003e296° \/ 300°\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eDuration at .050\"\u003c\/td\u003e\n\u003ctd\u003e234° \/ 228°\u003c\/td\u003e\n\u003ctd\u003e222° \/ 224°\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eValve lift (1.75:1)\u003c\/td\u003e\n\u003ctd\u003e.525\" \/ .472\"\u003c\/td\u003e\n\u003ctd\u003e.520\" \/ .497\"\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eValve lift (mm)\u003c\/td\u003e\n\u003ctd\u003e13.34 \/ 11.99\u003c\/td\u003e\n\u003ctd\u003e13.21 \/ 12.62\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003e8620 billet\u003c\/td\u003e\n\u003ctd\u003e8620 billet\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch4\u003eYou'll Need A Tune\u003c\/h4\u003e\n\n\u003cp\u003eWorth stating plainly. Cams change how the engine breathes across the entire rev range, and your existing tune was written for the factory profile.\u003c\/p\u003e\n\n\u003cp\u003ePlan on dyno time after installation. That's not an optional refinement, it's how you get the power the cams are capable of and how you make sure the engine is safe while making it.\u003c\/p\u003e\n\n\u003ch4\u003eFitment\u003c\/h4\u003e\n\n\u003cp\u003eHonda and Acura K20A, K20Z, and K24A2 engines.\u003c\/p\u003e\n\n\u003cp\u003eRequires Brian Crower valve spring kit BC0040 or BC0040S. Upgraded valve keepers recommended.\u003c\/p\u003e\n\n\u003ch4\u003eWho Should Run These Cams\u003c\/h4\u003e\n\n\u003cp\u003eThis is for the K-series builder who's done the bolt-ons, done the tune, and hit the ceiling of what a stock cam profile allows. High compression all-motor or a serious boosted setup, either way this is where the next real step comes from. Pick the profile matching your build, buy the spring kit at the same time, and book the dyno.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eFits:\u003c\/strong\u003e Honda and Acura K20A, K20Z, and K24A2. \u003cstrong\u003ePart numbers:\u003c\/strong\u003e BC0042-2 (naturally aspirated) and BC0041-2 (forced induction). \u003cstrong\u003eMaterial:\u003c\/strong\u003e 8620 billet. \u003cstrong\u003eRequired:\u003c\/strong\u003e Brian Crower valve spring kit BC0040 or BC0040S. \u003cstrong\u003eRecommended:\u003c\/strong\u003e upgraded valve keepers. \u003cstrong\u003eAlso required:\u003c\/strong\u003e ECU tuning after installation.\u003c\/p\u003e\n\u003c\/li\u003e\n\n \n\u003cli id=\"VehicleFitment\"\u003e\n 2002-2006 Acura RSX Type S\u003cdiv\u003e2004-2008 Acura TSX\u003c\/div\u003e\n\u003cdiv\u003e2006-2011 Honda Civic Si\u003c\/div\u003e \n\u003c\/li\u003e\n\n\n\n\n\u003cli id=\"TechnicalData\"\u003e\nN\/A Cams:\u003cdiv\u003eAdv Dur - 304°\/300°\u003c\/div\u003e\n\u003cdiv\u003eDur @ .050 - 234°\/228°\u003c\/div\u003e\n\u003cdiv\u003eValve Lift (1.75:1) - .525\"\/.472\"\u003c\/div\u003e\n\u003cdiv\u003eValve Lift (mm) - 13.34\/11.99  \u003cbr\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003eF\/I Cams:\u003c\/div\u003e\n\u003cdiv\u003eAdv Dur - 296°\/300°\u003c\/div\u003e\n\u003cdiv\u003eDur @ .050 - 222°\/224°\u003c\/div\u003e\n\u003cdiv\u003eValve Lift (1.75:1) - .520\"\/.497\"\u003c\/div\u003e\n\u003cdiv\u003eValve Lift (mm) - 13.21\/12.62  \u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\n\n\n \n\u003cli id=\"Included\"\u003e\n2 - Camshafts\n\u003c\/li\u003e\n\n\n\n\n\n\n\n\n\n\n\n\n\u003c\/ul\u003e\n","brand":"Brian Crower","offers":[{"title":"Naturally Aspirated","offer_id":47371344707618,"sku":"BRC-CAM-01-02","price":952.0,"currency_code":"USD","in_stock":false},{"title":"Forced Induction","offer_id":47371344740386,"sku":"BRC-CAM-01-02F","price":952.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2218\/5701\/files\/group-44694d14-33e2-4e18-9391-025cf89445b2-800.jpg?v=1788891836","url":"https:\/\/www.hybrid-racing.com\/products\/brian-crower-honda-acura-k20a-k20z-k24a2-stage-2-camshafts","provider":"Hybrid Racing","version":"1.0","type":"link"}