{"product_id":"034motorsport-pcv-breather-hose-034-101-3108","title":"034Motorsport PCV Breather Hose - Audi 2.9T\/3.0T (EA839)","description":"\u003cp\u003eUpgrade your factory corrugated plastic, failure-prone PCV breather hose with the high-performance, reliable 034Motorsport PCV Breather Hose, engineered for enhanced durability and long-lasting performance.\u003cbr\u003e\u003cbr\u003eThe PCV, or Positive Crankcase Ventilation system, on the EA839 is located on bank 2 of the engine (The right side of the engine). It is designed to ventilate the engine's positive crankcase pressure through the breather hose into the intake tract or charge air system. The breather hose plays an integral role in this ventilation system, which uses two check valves to control the flow of crankcase pressure.\u003c\/p\u003e\n\u003ch3\u003eHow Does the PCV System Operate?\u003c\/h3\u003e\n\u003cp\u003eThe Positive Crankcase Ventilation System on the EA839 works to remove excess pressure from the crankcase system and relies on the vacuum from the engine’s intake system to operate properly. At idle or cruising while not in boost, the engine’s charge air system operates under vacuum, drawing air in continuously. During this state, the PCV system utilizes this vacuum to release crankcase pressure into the charge air system through the connection just after the throttle body.\u003cbr\u003e\u003cbr\u003eHowever, when the vehicle is under boost (during acceleration), this connection becomes pressurized, meaning it can no longer provide a vacuum source for crankcase ventilation. When this happens, a check valve in the breather hose closes off this connection, preventing boost pressure from entering the crankcase. At this point, the breather hose is able to draw vacuum from the turbo inlet connection, as this creates vacuum through a siphoning effect as the turbocharger draws air in through the intake.\u003cbr\u003e\u003cbr\u003eWhether you are sitting at a stoplight or romping on a backroad, a properly operating PCV system is crucial for maintaining the engine’s performance and preventing harmful pressure buildup.\u003c\/p\u003e\n\u003cdiv class=\"col2-set\"\u003e\n\u003cdiv class=\"col-1\"\u003e\n\u003ch3\u003eWhy is the OE PCV System Insufficient?\u003c\/h3\u003e\n\u003cp\u003eThe check valves within the factory breather hose are an integral component of ensuring correct operation. However, since these check valves deal with the high temperatures of an engine bay and the transition between vacuum and boost pressure, they are susceptible to premature failure. When they fail, excess pressure can enter the crankcase, causing it to operate under conditions it was not designed for. In fact it’s likely these are the same as what Audi uses on naturally aspirated engines, which makes them not up to the task of dealing with pressures associated with turbocharged engines.\u003cbr\u003e\u003cbr\u003eAs the crankcase of the engine is not designed to operate under pressure, it typically will find the path of least resistance to release this excess pressure. The seals and components inside your engine, which are designed to operate under vacuum, aren’t built to handle this excess pressure. In some cases, the path of least resistance is unfortunately the oil cap, which can loosen and expel hot oil into the engine bay, potentially causing a fire.\u003cbr\u003e\u003cbr\u003eAudi issued a\u003cspan\u003e \u003c\/span\u003e\u003ca href=\"https:\/\/www.034motorsport.com\/docs\/tsb-oil-from-oil-cap-due-to-pcv-hose-failure.pdf\"\u003eTSB (Technical Service Bulletin)\u003c\/a\u003e\u003cspan\u003e \u003c\/span\u003econcerning this failure of the PCV Breather Hose as of 2020, though in our testing 034Motorsport has concluded that even the newest variant of breather hose is susceptible to failure.\u003cbr\u003e\u003cbr\u003eSome other solutions on the market neglect the importance of maintaining adequate vacuum pressure from the charge air system and intake tract to ensure proper operation of the PCV system. Because the PCV system relies on these two separate vacuum sources under normal operation, removing one would prevent the crankcase ventilation system from functioning properly.\u003cbr\u003e\u003cbr\u003eWhen these solutions remove the intake tract as a vacuum source, it disrupts the PCV system’s ability to vent crankcase pressure at idle or in a cruising state while not in boost. Because the crankcase no longer has sufficient vacuum pressure, seals that are designed to operate with this vacuum pressure can fail prematurely. This lack of vacuum pressure can also lead to the potential of pressurization of the crankcase system and engine damage.\u003cbr\u003e\u003cbr\u003eAdditionally, many aftermarket solutions have check valves that do not provide sufficient flow to accommodate the boost levels of Stage 3 equipped vehicles. These check valves are too small and this inefficiency can cause restrictions, resulting in reduced flow from the crankcase, causing crankcase pressure to build up.\u003cbr\u003e\u003cbr\u003eDuring the development of the 034Motorsport Stage 3 Dynamic+ tuning suite, the development B9 Audi S4 experienced an unfortunate OEM PCV breather hose failure.\u003cbr\u003e\u003cbr\u003eThis failure caused oil to be expelled through the oil cap and onto the hot turbocharger, immediately causing an engine oil fire. This failure was documented in our video Ashes to Asphalt, documenting the extent of the damage and how 034Motorsport was able to make the most out of the situation.\u003cbr\u003e\u003cbr\u003eBecause of this failure, it made engineering a proper solution that was able to withstand the harsh engine bay temperatures and elevated boost levels of utmost priority for 034Motorsport Engineers.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"034Motorsport","offers":[{"title":"3.0T","offer_id":49497799164208,"sku":"034-101-3108","price":263.0,"currency_code":"USD","in_stock":true},{"title":"2.9T","offer_id":49497799196976,"sku":"034-101-3109","price":263.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0677\/7582\/4176\/files\/034motorsport-pcv-breather-hose-2-9t-3-0t-034-101-3108-10.webp?v=1738349178","url":"https:\/\/es-performance.com\/en-us\/products\/034motorsport-pcv-breather-hose-034-101-3108","provider":"Eurosport Performance","version":"1.0","type":"link"}