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Do fabricated valve covers need to be vented?

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Old 03-25-2012, 07:41 PM   #1
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Default Do fabricated valve covers need to be vented?

Recently just put a set on my motor, and just wondering if they need to be vented at all? There are no provisions for one, just wondering what kinda things this may cause if I run them without any ventilation.
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Old 03-25-2012, 07:42 PM   #2
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Old 03-25-2012, 07:57 PM   #3
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how are you venting crankcase pressure?
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Old 03-25-2012, 09:57 PM   #4
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You need to vent crankcase pressure somehow. I have a vent on both sides of my engine. Take the valve covers off, bore a hole the size needed, insert grommet and vent filter, reinstall.
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Old 03-27-2012, 05:36 AM   #5
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Thx for the input guys I appreciate it.
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Old 03-27-2012, 04:29 PM   #6
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Install AN bungs on both valve covers and vent the engine into a catch can.
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Old 03-27-2012, 07:33 PM   #7
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I think im gonna run a single 12 an line to a catch can.
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Old 03-27-2012, 08:13 PM   #8
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great question.............and answers!

i think i bought the same valve covers............and i have been wondering the same thing.
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Old 03-27-2012, 09:05 PM   #9
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I bought those same covers and they kept leaking from blowing out the seal on the rails. The gasket would not stay in the groove for some reason so I sold them. Sure hope you have better luck
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Old 03-28-2012, 08:05 AM   #10
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.

What's the exact application??
You might consider a vac pump.

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Old 03-28-2012, 04:07 PM   #11
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If the car was going to see some street time then I would advise some sort of PCV system with a catch can.
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Old 03-28-2012, 08:28 PM   #12
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Quote:
Originally Posted by Firehawk441 View Post
Install AN bungs on both valve covers and vent the engine into a catch can.
x2 .
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Old 03-28-2012, 08:42 PM   #13
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would the -12 off one side to a catch can, not be enough? The car will see the street, but I have done some reading, and this seems to be the best option, If I need to vent both sides, I will but just wondering if it is necessary.
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Old 03-28-2012, 09:01 PM   #14
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You don't have to vent both sides, you can if you want to but the engine's pressure is pretty equeal. Only reason I have ever been given to vent both sides, was so the contaminents that are airborn, can leave from both sides of the engine since the heat and fumes rise, having a vent on both sides will help keep all of it out a little better. I can't say how much though.

I had a set of valve covers that had -10 bungs on them, so ran a -10 line, connected the 2 together with a T and then to a breather can like described above. If the bungs weren't already on the valve covers, I would have only put one on, fwiw.

Vac pump, if you keep the vacuum level at a reasonable setting, say 8 to 10 in, would be beneficial.
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Old 03-28-2012, 09:16 PM   #15
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Quote:
Originally Posted by krissoto View Post
would the -12 off one side to a catch can, not be enough? The car will see the street, but I have done some reading, and this seems to be the best option, If I need to vent both sides, I will but just wondering if it is necessary.
That is NOT a cut and dry answer. It depends on how much crankcase pressure there is in a given application. An N/A engine with moderate cubes and moderate compression won't create the pressure that big cube, high compression, or power adder engines will. Start with one and go from there. DO NOT however "T" off your hoses into a catch can. Both hoses should have there own entry when using a single catch can.
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