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pcv or evacuation system for a weber set up
Hey guys. Installing 44 IDF webers on my FIA 289. Purchased the system from Top End. But there is no where to hook up my pcv. Any suggestions. Most common comment I've seen is to run tubes to headers from breathers of each valve cover. Then Top End said to run to catch can. With pcv and open breather on other valve cover? Anyway any help will be greatly appreciated. Thanks, Paul
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Paul, I've got 44IDFs on my 289FIA and I'll be interested to see what suggestions you get.
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Unless you plan to run a vacuum hose from each intake manifold runner to a common vacuum chamber for all of the cylinders I would not run a PCV valve. Instead run two vented breathers, one on each valve cover. If you are determined to run a PCV for inspection purposes you can drill and tap one intake runner and then plug it after the inspection has been signed off. I would not run the engine permanently with only one cylinder hooked up to the PCV valve as that cylinder will not operate the same as the other seven cylinders. I have seen people attach the PVC to a carburetor air horn by putting a bung on the air horn for the PCV hose to attach to, this would not alter the cylinders performance over the other seven cylinders.
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I am running a draft tube on mine. It is simple, clean setup, that actually works once in motion.
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OK guys here is what I've come up with. I spent some time at Pep Boy's talking with Scott. We discussed different options and came up with this. He ordered a catch can with two outlets and a breather on top. I ordered two breather caps with pcv and breather tube from Speedway Motors. I plan to mount the catch can on the firewall and then run lines from the breather caps to the catch can. May take a while to get all of these parts. In the meantime I've pretty much finished with the install of the Webers. Anxious to fire off the 289!
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I've asked this question in the past. I had the Roush 427IR with the fuel-injected faux-Weber setup and the PCV ports were topped with a K&N breather. Fortunately Colorado didn't require me to connect up an emissions-compliant PCV system.
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48 IDF's on a 347 since 2008
In colorado , kit vehicles are emission exempt. I have 2 breathers and no PCV. |
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I too have no PCV, just breathers as JOHN said. |
I have two breathers, per side. I run plastic pot scrubbers in each of the breather tubes, to help the oil vapors condense before dribbling out of the breather caps. Was working pretty well, but I'm thinking that my 35K miles of running just screens on the Webers has given me some ring failure and I have bypass pressure blowing oil out of practically all the gasket surfaces. Not really wanting to do a re-ring job, this year, I'm looking for another fix. Will exhaust scavenging work to pull pressure out of the crankcase or would it actually add more pressure?
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And, a couple more questions.
Wolf, where does your draft tube attach? Breather tube cap? Paul, are you planning for just the crankcase pressure to blow oil vapor into your catch can? Too bad there's not an "Alumaseal" type product that would work on the crankcase. ha Imagine how quickly all the smaller oil passage holes would get clogged up. |
Karl,
Road draft tube on passenger side valve cover, breather on driver side valve cover. https://preview.ibb.co/cZEjL7/IMG_0307.jpg https://preview.ibb.co/hEQr07/IMG_0309.jpg |
I don't want to change this thread, but I have one question.
I assume,.....these are not needed for EFI systems ? |
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Randy, bet that set up took a little head scratching.
However, I was messing this morning and thought that just for the hey of it all, I'd pull one of the two hex drive plugs that are in the middle of my manifold. I'd never really given them any thought and HARK! there was plenty of vacuum sucking. Just made my dilemma oh so much easier to deal with. |
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Thank you. |
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Like this.....
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An old drag racers trick is to apply a slight vacuum to the crankcase by installing EGR valves, one way check valves, into the collector area of the header on each side and attach a hose between them and a fitting on each valve cover or a crankcase breather. The Exhaust pulses create a suction which in turn cause a slight vacuum within the crankcase, drag racers looked at it as free horsepower as the pistons were having to pressurize the crankcase when heading to BDC.
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