{"product_id":"bmw-eccentric-shaft-bmw-n20-eccentric-shaft-f20-f21-f22-f30","title":"BMW Eccentric Shaft","description":"\u003ch2 class=\"description-card-module_description-title_2MoSl\"\u003eDescription\u003c\/h2\u003e\n\u003cdiv class=\"show-more-module_show-more_14Rud show-more\"\u003e\n\u003cdiv class=\"show-more-module_content-wrapper_1xBVe show-more-inner\"\u003e\n\u003cdiv class=\"product-description  product-description-module_product-description_3bMdX\"\u003e\n\u003cp\u003eThe camshaft eccentric (or Valvetronic eccentric shaft) is a key part of BMW's Valvetronic system, and its role is a bit different from that of a standard camshaft. Here's a clear breakdown:\u003c\/p\u003e\n\u003ch3\u003e1. Purpose\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eIn a conventional engine, the camshaft opens and closes the intake and exhaust valves with a fixed lift and duration.\u003c\/li\u003e\n\u003cli\u003eBMW's Valvetronic system adds variable valve lift: it can change how far the intake valves open, which controls the amount of air entering the engine without using the throttle.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe eccentric shaft is the central part that makes this variable lift possible.\u003c\/p\u003e\n\u003ch3\u003e2. How it works\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eThe eccentric shaft is connected to a linkage mechanism attached to the intake camshaft.\u003c\/li\u003e\n\u003cli\u003eBy rotating slightly, the shaft changes the angle of the intermediate rocker arms, which in turn changes how far the intake valves open.\u003c\/li\u003e\n\u003cli\u003eThis allows the engine to:\u003cbr\u003eImprove fuel efficiency\u003cbr\u003eReduce emissions\u003cbr\u003eProvide smoother idling and more precise throttle response\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e3. In short\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eIt doesn't directly turn the valves like a standard camshaft.\u003c\/li\u003e\n\u003cli\u003eIt adjusts the valve lift dynamically, acting as a mechanical \"volume control\" for the engine's airflow.\u003c\/li\u003e\n\u003cli\u003eWorks together with the camshaft, Valvetronic motor, and engine sensors to optimize performance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch1\u003e\u003cbr\u003e\u003c\/h1\u003e\n\u003ch1\u003eOEM Part Number: 11377589883\u003c\/h1\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"VelocityAutoSpares","offers":[{"title":"Default Title","offer_id":49256690516212,"sku":"410038","price":7499.0,"currency_code":"ZAR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0843\/4096\/5620\/files\/8ca231f5-49ee-4c6f-88a2-898e4e7b9899_imgupscaler.ai_v2_Pro__2K.png?v=1787661246","url":"https:\/\/velocityautospares.co.za\/products\/bmw-eccentric-shaft-bmw-n20-eccentric-shaft-f20-f21-f22-f30","provider":"VelocityAutoSpares","version":"1.0","type":"link"}