{"product_id":"rcm-subaru-ej-main-bearing-journal-pinned-line-bore-engineering-process","title":"RCM Subaru EJ# Main Bearing Journal Pinned \u0026 Line bore Engineering Process","description":"\u003ch2 data-start=\"250\" data-end=\"307\"\u003eRCM Subaru EJ# Line bore \u0026amp; Main Bearing Pinning Process\u003c\/h2\u003e\n\u003cp data-start=\"309\" data-end=\"655\"\u003eAt RCM Engineering, precision, reliability, and performance are engineered into every stage of our Subaru EJ-series engine preparation. Developed from our Gobstopper program, our combined line bore and main bearing pinning process ensures absolute main tunnel alignment and long-term structural stability — essential for both high-performance road and motorsport applications.\u003c\/p\u003e\n\u003ch3 data-start=\"657\" data-end=\"688\"\u003eWhy the Process Matters\u003c\/h3\u003e\n\u003cp data-start=\"690\" data-end=\"986\"\u003eThe Subaru EJ engine’s split-case design offers excellent strength-to-weight characteristics, but under high power, heat, and load, the main bearing housings can subtly shift. This microscopic movement leads to bearing wear, oil pressure loss, and crankshaft misalignment over time.\u003c\/p\u003e\n\u003cp data-start=\"988\" data-end=\"1230\"\u003eTo counteract this, RCM developed a unique engineering process that combines precision line boring with bearing cap pinning — delivering permanent stability and exceptional crankshaft alignment, even in the most demanding conditions.\u003c\/p\u003e\n\u003cul data-start=\"1996\" data-end=\"2355\"\u003e\n\u003cli data-start=\"1996\" data-end=\"2133\"\u003e\n\u003cp data-start=\"1998\" data-end=\"2133\"\u003eEach main cap is precisely drilled and fitted with hardened steel dowel pins, securely locking it to its corresponding case half.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2134\" data-end=\"2227\"\u003e\n\u003cp data-start=\"2136\" data-end=\"2227\"\u003eThis eliminates even the slightest cap movement under extreme stress and thermal cycling.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2228\" data-end=\"2355\"\u003e\n\u003cp data-start=\"2230\" data-end=\"2355\"\u003eThe result is a rigid and repeatable main structure, maintaining perfect bearing geometry for the lifetime of the engine.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1420\" data-end=\"1518\"\u003e\n\u003cp data-start=\"1422\" data-end=\"1518\"\u003eThe main bearing tunnel is digitally measured to identify any deviation from factory geometry.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1519\" data-end=\"1641\"\u003e\n\u003cp data-start=\"1521\" data-end=\"1641\"\u003eUsing advanced CNC machining and line-honing equipment, the tunnel is corrected to within micron-level tolerances.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1642\" data-end=\"1793\"\u003e\n\u003cp data-start=\"1644\" data-end=\"1793\"\u003eThis ensures perfect concentricity across all five main bearings, guaranteeing smooth crank rotation, consistent oil film, and balanced bearing load.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-start=\"2362\" data-end=\"2387\"\u003eThe RCM Advantage\u003c\/h3\u003e\n\u003cp data-start=\"2389\" data-end=\"2466\"\u003eOur combined line bore and pinning process delivers measurable benefits:\u003c\/p\u003e\n\u003cul data-start=\"2467\" data-end=\"2740\"\u003e\n\u003cli data-start=\"2467\" data-end=\"2546\"\u003e\n\u003cp data-start=\"2469\" data-end=\"2546\"\u003ePermanent main bearing stability, even under high torque or boost loads\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2547\" data-end=\"2605\"\u003e\n\u003cp data-start=\"2549\" data-end=\"2605\"\u003eImproved oil pressure consistency and bearing life\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2606\" data-end=\"2671\"\u003e\n\u003cp data-start=\"2608\" data-end=\"2671\"\u003eReduced frictional losses and enhanced rotational balance\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2672\" data-end=\"2740\"\u003e\n\u003cp data-start=\"2674\" data-end=\"2740\"\u003eRepeatable reliability for competition and endurance engines\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"2742\" data-end=\"2894\"\u003eEvery machined block undergoes final inspection and digital measurement verification, ensuring RCM’s trademark standards of precision before assembly.\u003c\/p\u003e\n\u003ch3 data-start=\"2901\" data-end=\"2953\"\u003eProven in Motorsport, Perfected for the Road\u003c\/h3\u003e\n\u003cp data-start=\"2955\" data-end=\"3281\"\u003eFrom Time Attack winning engines to world-record-breaking road builds, RCM’s engineering processes have been proven time and time again under the harshest conditions. Whether you’re building a 400 bhp road car or a 900 bhp race engine, our line bore and bearing pinning process provides the precision foundation your EJ deserves.\u003c\/p\u003e\n\u003cp data-start=\"3283\" data-end=\"3336\"\u003eRCM Engineering — Precision. Performance. Proven.\u003c\/p\u003e","brand":"RCM","offers":[{"title":"Default Title","offer_id":45680544252065,"sku":"RCM3730","price":3358.0,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0677\/9738\/5377\/files\/Engine_Block-2.jpg?v=1769725946","url":"https:\/\/www.gotitrex.com.au\/products\/rcm-subaru-ej-main-bearing-journal-pinned-line-bore-engineering-process","provider":"Gotitrex","version":"1.0","type":"link"}