{"id":456,"date":"2012-09-30T16:40:11","date_gmt":"2012-09-30T16:40:11","guid":{"rendered":"http:\/\/mewagner.com\/?page_id=456"},"modified":"2025-06-01T13:11:20","modified_gmt":"2025-06-01T17:11:20","slug":"faq","status":"publish","type":"page","link":"https:\/\/mewagner.com\/?page_id=456","title":{"rendered":"Dual Flow\u00ae<\/sup> PCV Valve – FAQ"},"content":{"rendered":"

Frequently Asked Questions<\/strong><\/p>\n

Q:<\/strong><\/em>\u00a0 I’m not familiar with how a PCV valve works.\u00a0 What does it do?
\nA:\u00a0<\/strong> <\/em>Ray Bohacz wrote an article for Hemmings Muscle Machines that provides an excellent overview of PCV system functionality.\u00a0 We recommend reading Ray’s article here<\/a> for an introduction to PCV systems.<\/p>\n

Q:<\/strong><\/em>\u00a0 Why would I want to run dirty crankcase vapors back through my engine?\u00a0 My bench racing buddies tell me that a PCV valve is really not necessary, and will just dirty up my engine.
\nA:\u00a0<\/strong> <\/em>There are many false rumors circulating regarding how a PCV valve should function, and whether or not you need to run one.\u00a0 The facts are that PCV valves have been used on nearly every production automobile for 50+ years, and the need to have a properly functioning PCV system on every vehicle cannot be overstated.\u00a0 Although at first it may seem counterintuitive, having a properly functioning PCV system will actually keep your engine’s crankcase much cleaner<\/em> over the long term.\u00a0 This is firmly established knowledge among automobile manufacturers with many years of data as validation.<\/p>\n

Q:<\/strong><\/em>\u00a0 What are some symptoms of an improperly functioning PCV valve?
\nA:\u00a0<\/strong> <\/em>Typical symptoms include:
\nSymptom 1: Difficulty tuning at idle.<\/em>\u00a0 This often occurs on vehicles with radical camshafts using a mismatched PCV valve, the PCV may be transitioning into cruise mode while the engine is still at idle, causing too much airflow.<\/p>\n

Symptom 2: Oil and crankcase vapors constantly accumulating around the valve cover breather.<\/em> The breather opposite the PCV valve should act as a fresh air inlet if the PCV system is working properly.\u00a0 Constant oil accumulation around this breather indicates the PCV system is not flowing enough air to evacuate the crankcase, causing excess vapors to force their way out.<\/p>\n

Symptom 3:\u00a0 Accumulation of crankcase sludge and dirty oil.<\/em>\u00a0 The long term effect of a PCV system flowing an inadequate amount of air is dirty oil and accumulation of crankcase sludge.\u00a0 The Dual Flow PCV Valve is the only PCV valve available that lets you tailor the PCV system’s flow rate to your specific engine combination.<\/strong><\/em><\/p>\n

Symptom 4:\u00a0 Oil leaks.<\/em>\u00a0 Some, but not all oil leaks may be caused or made worse by excessive pressure in the crankcase.\u00a0 An improperly matched PCV valve can contribute to crankcase pressure. \u00a0The Dual Flow PCV Valve is scientifically proven to keep the crankcase under a slight vacuum more than any stock PCV valve.\u00a0 See our flow test shootout<\/a> results for more details.<\/strong><\/em><\/p>\n

Q:<\/strong><\/em>\u00a0 PCV valves have been around since the 1960s.\u00a0 How is the Dual Flow PCV Valve different?
\nA:\u00a0<\/strong> <\/em>The design of the PCV valve has remained relatively unchanged since its inception over 50 years ago.\u00a0 A stock style PCV valve has one airflow circuit, which varies airflow from a reduced amount at idle to an increased amount of flow under cruising conditions.\u00a0 These flow rates, as well as the vacuum level at which the valve transitions from idle to cruise mode, are not adjustable by the end user.\u00a0 Furthermore, it is difficult to obtain proper flow data to determine which stock style valve (if any) is correct for a modified application.<\/p>\n

The M\/E Wagner Dual Flow PCV Valve is unique in that it is fully tunable by the end user.\u00a0 Our patented Dual Flow technology (US Pat. No. 9,376,945<\/b>) splits airflow into independent idle and cruise circuits, giving you the ultimate in control over your tuneup.\u00a0 Each circuit is independently tunable to allow for full customization to your specific application.\u00a0 Flow rate as well as transition vacuum level can be adjusted with the turn of a screw.<\/p>\n

Q:<\/strong><\/em>\u00a0 Will a Dual Flow PCV Valve fit my application?
\nA:\u00a0<\/strong> <\/em>Most PCV Valves for domestic V6 and V8 applications have very similar dimensions.\u00a0 See Dimensions and Technical Data<\/a> to check your particular application.\u00a0 We also offer an Inline Adaptor<\/a> for engines that do not mount the PCV valve in the valve cover.<\/p>\n

Q:<\/strong><\/em>\u00a0 I have been using a stock style PCV valve on my performance engine and it runs fine.\u00a0 Why do I need a Dual Flow PCV Valve?
\nA:\u00a0<\/strong> <\/em>Your stock style PCV valve may not be working as well as you think.\u00a0 Two common issues with an improperly matched PCV valve are idle tuning difficulties and inadequate flow during cruising conditions.\u00a0 You may have already “worked around” idle tuning difficulties by other means and achieved a usable idle.\u00a0 Even if this is true, your stock style PCV Valve may not be flowing an adequate amount of air to properly ventilate your crankcase during cruising conditions<\/em>.<\/p>\n

We have found that many stock style PCV valves used on performance applications have a very weak spring, which guarantees the PCV valve will not flow too much air at idle on engines with decreased idle vacuum signals.\u00a0 While a weak spring stock style PCV valve allows for easier idle tuning, these valves seldom (if ever) transition to higher flow rates during cruising conditions.\u00a0 Improper crankcase ventilation can lead to several long term problems, such as contaminated oil and accumulation of crankcase sludge.<\/p>\n

The Dual Flow PCV Valve is the only PCV valve on the market that can be specifically matched to your engine.\u00a0 Unlike a stock PCV valve, you can verify it is working properly<\/em> after tuning is complete.<\/p>\n

Q:<\/strong><\/em>\u00a0 My engine has a very weak idle vacuum signal.\u00a0 Will a Dual Flow PCV Valve work?
\nA:\u00a0<\/strong> <\/em>Yes.\u00a0 For engines with a very weak or unstable vacuum signal at idle, the Dual Flow PCV Valve can operate in fixed orifice mode. See Fixed Orifice Mode Tuning<\/a> for more details.<\/p>\n

Q:<\/strong><\/em>\u00a0 I can set the idle flow rate for my specific engine using the idle adjustment screw, how is the flow rate under cruising conditions set?
\nA:\u00a0<\/strong> <\/em>The cruise flow rate is set by internal porting in the valve.\u00a0 The Dual Flow PCV Valve will take the idle flow rate set by you, and add the correct amount of additional flow when cruise mode is activated.\u00a0 This port size is precision machined and was developed based on scientific testing and flow data from a wide variety of applications.<\/p>\n

Q:<\/strong><\/em>\u00a0 Does the Dual Flow PCV Valve offer backfire protection for my engine?
\nA:\u00a0<\/strong> <\/em>Yes.\u00a0 The Dual Flow PCV Valve uses two stainless steel check balls to positively seal against reverse flow under an intake backfire.<\/p>\n

Q:<\/strong><\/em>\u00a0 My engine is worn and has a lot of blowby.\u00a0 Will my Dual Flow PCV Valve get clogged with contaminants over time?
\nA:\u00a0<\/strong> <\/em>The Dual Flow PCV Valve is fully rebuildable and cleanable.\u00a0 It can be completely disassembled for cleaning if necessary.\u00a0 Rebuild kits<\/a> are also available.<\/p>\n

Further questions? Email support@mewagner.com<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

Frequently Asked Questions Q:\u00a0 I’m not familiar with how a PCV valve works.\u00a0 What does it do? A:\u00a0 Ray Bohacz wrote an article for Hemmings Muscle Machines that provides an excellent overview of PCV system […]<\/a><\/p>\n<\/div>","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-456","page","type-page","status-publish"],"_links":{"self":[{"href":"https:\/\/mewagner.com\/index.php?rest_route=\/wp\/v2\/pages\/456","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/mewagner.com\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/mewagner.com\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/mewagner.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/mewagner.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=456"}],"version-history":[{"count":48,"href":"https:\/\/mewagner.com\/index.php?rest_route=\/wp\/v2\/pages\/456\/revisions"}],"predecessor-version":[{"id":2721,"href":"https:\/\/mewagner.com\/index.php?rest_route=\/wp\/v2\/pages\/456\/revisions\/2721"}],"wp:attachment":[{"href":"https:\/\/mewagner.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=456"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}