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The Terminator
Engine/Tuning
Using Valve Cover Breathers
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<blockquote data-quote="beaterbike" data-source="post: 14090906" data-attributes="member: 143034"><p>Food for thought. Most engines outrun their pcv systems , in other words the blow by gasses are more than the pcv system can handle at full steam. When this happens the crankcase gasses just get pushed into the intake through the hose going to the inlet and the pcv valve . Why ? because supercharger or NA there is no vacuum when the throttle is on the floor this is the same time the most blow by gasses are produced. So when the crankcase is pressurized from blow by it will exit through the breathers causing the oil residue on the valve covers. I personally would run the pcv and fresh air ports from the valve cover to a breather tank to catch the oil. One it eliminates the pcv gasses which lower the effective octane of your fuel and two it keeps your intake cleaner on the inside. Ever notice the cams and cyl head under the valve cover look darker or varnished on the right side ? just so happens this is the side where the "fresh air inlet " to the engine is. The dark or dirty look is because the oil catches everything your air filter didn't.</p></blockquote><p></p>
[QUOTE="beaterbike, post: 14090906, member: 143034"] Food for thought. Most engines outrun their pcv systems , in other words the blow by gasses are more than the pcv system can handle at full steam. When this happens the crankcase gasses just get pushed into the intake through the hose going to the inlet and the pcv valve . Why ? because supercharger or NA there is no vacuum when the throttle is on the floor this is the same time the most blow by gasses are produced. So when the crankcase is pressurized from blow by it will exit through the breathers causing the oil residue on the valve covers. I personally would run the pcv and fresh air ports from the valve cover to a breather tank to catch the oil. One it eliminates the pcv gasses which lower the effective octane of your fuel and two it keeps your intake cleaner on the inside. Ever notice the cams and cyl head under the valve cover look darker or varnished on the right side ? just so happens this is the side where the "fresh air inlet " to the engine is. The dark or dirty look is because the oil catches everything your air filter didn't. [/QUOTE]
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