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Forums->Hot Heads Tech Talk->Valvecover breather

oldboy
Valvecover breather


Hello,
I am in The process of changing the original valve covers out for some aftermarket units .
There is a PCV valve on the lifter valley pan .
Is it mandatory for the valve covers to have their own individual breathers ?
Can there be one just one on one side, or is one for each valve cover required ?
Thanks
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on: Tue 19 of Jun, 2018 [13:11 UTC] reads: 2358

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hemistude
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Re: Valvecover breather
on: Tue 19 of Jun, 2018 [19:21 UTC] score: 0.00
> I am going to put one breather on the passenger side valve cover, mounted a good distance from the pcv valve.

Oldboy,

You'll be good to go with that setup. as long as there's a place to fill it with oil and a way for air to get into the engine, you're good. Be sure to replace the PCV. they only cost a few bucks. Cheap insurance!

Dave

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Jack
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Re: Re: Valvecover breather
on: Wed 20 of Jun, 2018 [16:09 UTC] score: 0.00
I have that same valley cover with PCV, NO OTHER BREATHER.
Works fine.

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oldboy
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Re: Valvecover breather
on: Tue 19 of Jun, 2018 [18:50 UTC] score: 0.00
> Hello,
Okay there is a pcv on lifter valley cover, also the oil fill cover, screw in type, non vented.
I am going to put one breather on the passenger side valve cover, mounted a good distance from the pcv valve.
This will be the only venting on the motor.

author message
oldboy
user offline
Re: Valvecover breather
on: Tue 19 of Jun, 2018 [16:31 UTC] score: 0.00
> Hello,
> I am in The process of changing the original valve covers out for some aftermarket units .
> There is a PCV valve on the lifter valley pan .
> Is it mandatory for the valve covers to have their own individual breathers ?
> Can there be one just one on one side, or is one for each valve cover required ?
> Thanks

I currently gave an airtight crankcase oil fill plug. A Hothead unit that screws into the lifter valley pan.
The new reproduction valve covers do you not have a provision for breathers . I can drill and modify reuse one of the aftermarket breathers off the old valve covers .
So if I only use one valve cover with a breather and I have a PCV valve all is good?
Thanks.

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hemistude
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Re: Valvecover breather
on: Tue 19 of Jun, 2018 [15:44 UTC] score: 0.00

> Is it mandatory for the valve covers to have their own individual breathers ?

Do you still have the oil filler tube in place on your engine? If so, are you using a "breather-type" filler cap? If you still have a vented cap on your filler tube, you have everything you need and breathers on the valve/rocker covers aren't necessary for the system to work.

All it takes is a way to move fresh air into the crankcase to replace the fumes that are drawn out through the valley-mounted PCV.

If you wanted to take the route of eliminating the filler tube or capping it with an airtight cap , then by all means add a breather to either or both valve/rocker covers. Whatever you do, you still need a way to add oil though.

Some think cover mounted breathers look cool... others like a clean look. Either way is acceptable depending on what you do with the filler tube.

Good luck!

Dave



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George
user offline
Re: Valvecover breather
on: Tue 19 of Jun, 2018 [15:02 UTC] score: 0.00
No, you can use the OEM oil fill cap, it's vented for air flow. If you must cause damage to the covers, I'd think one on each side as far away from the PCV valve would be best.


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