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  • 1 Post By DennyW

Thread: Some questions about pcv vacuum hook ups on my FE390 with a race cam
          
   
   

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  1. #1
    stotzbotz is offline CHR Member Visit my Photo Gallery
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    Some questions about pcv vacuum hook ups on my FE390 with a race cam

     



    Hello again. Recently I had brought up a situation where there was too much oil build up in my valve cover on my driver's side of my FE390. It does have solid lifters, heavy duty springs and a race cam in it however I did not install it myself so I don't have the specs. The guy who originally built it mentioned something about a 5 point cam or a .5 something. Sorry but he was really strange and had the car practically stole from him so he was quite bitter when talking about it. . My question about this set up is that the Edelbrock Performer carb and intake when put together partially block the front vacuum passage where I have the pcv valve hose connected. There is a split down the middle of the intake port so it is goes right over the vacuum port on the carb. There is some passage slots that go to both primary openings so there is still some vacuum created. I was wondering if I should connect the pcv hose to the vacuum port on the back right of the intake where I have my transmission and hook that line to the front of the carb. The old Weiand intake that was on this car had about half of the center separator part cut away from it but the cut looked factory. It was also on the back half of the carb. This car has a high volume oil pump in it and combined with the race cam and lower vacuum I was thinking anything that I can do to draw more fumes and pressure out of a newly rebuilt engine like this would be beneficial. Any thoughts would be greatly appreciated.

  2. #2
    DennyW is offline CHR Member Visit my Photo Gallery
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    Without knowing any specs. Lets take the easy route then. Do you have a vacuum gauge so you can see what the vacuum is when the engine is all the way warmed up. That is the only way you will know WHAT PCV VALVE you need. The PCV valve spring is calibrated for the vacuum amount that an engine creates. If you put the wrong one in, it will not function like it is supposed to. That is start number one.
    Once you know what the running vacuum is of the engine, you can then go to the parts store, and check the book specs, so you can make sure you get the correct one...
    NTFDAY likes this.

  3. #3
    NTFDAY's Avatar
    NTFDAY is offline CHR Member Visit my Photo Gallery
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    Thanks, Denny, I didn't know that just always bought one for whatever car it was for.
    Ken Thomas
    NoT FaDe AwaY and the music didn't die
    The simplest road is usually the last one sought
    Wild Willie & AA/FA's The greatest show in drag racing

  4. #4
    stotzbotz is offline CHR Member Visit my Photo Gallery
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    I'm getting 13 psi vacuum at the pcv hose while the engine is warmed up and idling at 1000 rpm. Is there a certain rated pcv valve I should ask for with this amount of vacuum?

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