PCV system
From Crankshaft Coalition Wiki
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==PCV valves for modified engines== | ==PCV valves for modified engines== | ||
| − | Big cams with low idle vacuum throw can throw off a stock PCV valve, creating a lean idle. Normally at idle the PCV is in the low flow position. But if the PCV valve is open at idle (because of low idle manifold vacuum caused by a big cam), the idle gets lean and unstable and may suck too much oil along with too much air. This is akin to a big vacuum leak at idle because the PCV is open at idle instead of in the idle (low flow) position. | + | Big cams with low idle vacuum throw can throw off a stock PCV valve, creating a lean idle. Normally at idle the PCV is in the low flow position. But if the PCV valve is open at idle (because of low idle manifold vacuum caused by a big cam), the idle gets lean and unstable and may suck too much oil along with too much air. This is akin to a big vacuum leak at idle because the PCV is open at idle instead of in the idle (low flow) position. |
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| + | ===PCV on a turbocharged engine=== | ||
| + | *Hotrodders forum post [http://www.hotrodders.com/forum/correct-way-plumb-pcv-system-turbo-car-247049.html The correct way to plumb a PCV system on a turbo car] | ||
==PCV valve specs== | ==PCV valve specs== | ||
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For those who can spend ~ $130.00 for an adjustable PCV valve, this might fit the bill: | For those who can spend ~ $130.00 for an adjustable PCV valve, this might fit the bill: | ||
[http://mewagner.com/ M/E Wagner] | [http://mewagner.com/ M/E Wagner] | ||
| − | + | [[File:M-E Wagner Cutaway-3-views.jpg|250 px]] | |
| + | [[File:M-E Wagner pcv1.jpg|250 px]] | ||
==Alternatives== | ==Alternatives== | ||
* Road draft tube: should be avoided | * Road draft tube: should be avoided | ||
* Venting to the exhaust: instead of feeding the crank fumes to the carb, and hard line can be run to the exhaust. The escaping gas creates a low pressure enough to draw the fumes out of the engine. This is a slight improvement on the road draft tube, but complete burning of the byproducts will not occur. Deposits on your exhaust system is likely and if you go this route be sure to plumb the line downstream of any catalytic converts and O2 sensors. The EPA will not like this and is more than likely illegal for street use and will not pass local inspections. Check your applicable laws before proceeding. | * Venting to the exhaust: instead of feeding the crank fumes to the carb, and hard line can be run to the exhaust. The escaping gas creates a low pressure enough to draw the fumes out of the engine. This is a slight improvement on the road draft tube, but complete burning of the byproducts will not occur. Deposits on your exhaust system is likely and if you go this route be sure to plumb the line downstream of any catalytic converts and O2 sensors. The EPA will not like this and is more than likely illegal for street use and will not pass local inspections. Check your applicable laws before proceeding. | ||
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[[Category:Engine]] | [[Category:Engine]] | ||
[[Category:Undeveloped articles]] | [[Category:Undeveloped articles]] | ||
[[Category:Undeveloped Engine articles]] | [[Category:Undeveloped Engine articles]] | ||
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