{"product_id":"acl-race-series-main-bearing-set-tight-clearance-hyundai-i30-n-veloster-n-elantra-n-kona-n-2-0t","title":"ACL Race Series Main Bearing Set, Tight Clearance - Hyundai i30 N \/ Veloster N \/ Elantra N \/ Kona N 2.0T","description":"\u003cp\u003e\u003cstrong\u003eACL Race Series Main Bearing Set, tight clearance\u003c\/strong\u003e — ten tri-metal shells covering all five main journals of the 2.0 litre Theta II turbo block, machined with a thicker wall so the assembled engine runs \u003cstrong\u003e0.025 mm (0.001 in) less oil clearance\u003c\/strong\u003e than our standard set.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eRead this before you order: this is a clearance grade, not an undersize bearing.\u003c\/strong\u003e ACL list it on the same table as the standard and extra-clearance sets, all three for a crankshaft at standard journal size. It is the tight mirror image of the extra-clearance set we also stock. \u003cstrong\u003eIf your crankshaft has been reground undersize, this is the wrong part\u003c\/strong\u003e — see our 0.25 mm undersize main set instead.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWho it is for.\u003c\/strong\u003e A build where you want a tighter oil film than standard, or a crankshaft that measures slightly under standard through wear or a light polish and needs clearance brought back into specification without a regrind. Tighter clearance holds oil pressure better and quietens a cold start; it leaves less margin for housing distortion, so it suits a controlled build rather than an extreme one.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFitment — ACL's own application guide names the i30 N.\u003c\/strong\u003e Hyundai i30 N 2018 on, Veloster N 2019-2022, Elantra N 2022-2026 and Kona N 2022-2023 — 2.0L Theta II turbo (G4KH). Journal and tunnel dimensions are unchanged from the standard set; only the wall thickness differs.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFrom ACL:\u003c\/strong\u003e tri-metal construction, with a lead-tin-copper overlay over a nickel barrier layer and a copper-lead-tin lining on SAE1010 high-tensile steel. Full 180 degree grooved uppers with matching partial grooves in the lowers, tapered groove run-out and enlarged chamfers, so big-end oil supply is never cut off abruptly.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDetails:\u003c\/strong\u003e 10 shells, 5 upper and 5 lower, positions 1 to 5; standard journal size with 0.025 mm (0.001 in) reduced clearance; block tunnel bore 56.000-56.018 mm; crank main journal 51.942-51.960 mm; wall approximately 0.0125 mm thicker per shell than the standard set.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMixing grades is normal practice.\u003c\/strong\u003e ACL expect builders to mix adjacent grades on one journal to reach a target clearance — one tight shell paired with one standard shell halves the change, to 0.0125 mm (0.0005 in). On a main bearing the thicker shell goes in the cap half.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eNo thrust washers are included.\u003c\/strong\u003e This set is ten shells only, so source thrust washers separately.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA note on appearance.\u003c\/strong\u003e Race Series shells arrive dark and tarnished, with no cosmetic tin flash. Deliberate, not a defect.\u003c\/p\u003e\n\u003cp\u003eFinal oil clearance is the engine builder's responsibility. Measure the assembled bearing bores before you commit.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAvailability:\u003c\/strong\u003e ON ORDER at our distributor as of 6 November 2026.\u003c\/p\u003e\n\u003cp\u003eNot sure this suits your car? Ask us before ordering — we would rather check the fitment than process a return.\u003c\/p\u003e","brand":"ACL","offers":[{"title":"Default Title","offer_id":50961585897658,"sku":"ACL-5M1295H-.025","price":427.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0276\/1359\/3623\/files\/5M.jpg?v=1793898310","url":"https:\/\/n75motorsports.ca\/products\/acl-race-series-main-bearing-set-tight-clearance-hyundai-i30-n-veloster-n-elantra-n-kona-n-2-0t","provider":"N75 MotorSports","version":"1.0","type":"link"}