PCV system
(→DIY catch can) |
(→Fixed orifice PCV system) |
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==Fixed orifice PCV system== | ==Fixed orifice PCV system== | ||
The LQ4 6.0L crate engine from GM comes with a fixed orifice in the valve cover. The paperwork says to throw the original PCV valve away and connect the hose to the nipple. It appears they are finding the correct size orifice for the engine vacuum and are no longer using a valve. Perhaps a small inline needle valve to adjust crankcase vacuum flow might be the ticket. Not too much to cause a major leak, just enough to evacuate the crankcase. | The LQ4 6.0L crate engine from GM comes with a fixed orifice in the valve cover. The paperwork says to throw the original PCV valve away and connect the hose to the nipple. It appears they are finding the correct size orifice for the engine vacuum and are no longer using a valve. Perhaps a small inline needle valve to adjust crankcase vacuum flow might be the ticket. Not too much to cause a major leak, just enough to evacuate the crankcase. | ||
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| + | A fixed orifice system may not work in all applications, especially forced induction. The pintle valve acts a check valve allowing pressure to move one direction. Likewise, the old pintle valve system acts like a spark arrestor, preventing any combustion gasses from entering the valve cover should a backfire occur. | ||
==High tech adjustable PCV== | ==High tech adjustable PCV== | ||
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