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Old 01-20-2010, 07:53 PM
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Where can I connect the PCV valve..??

I got this problem on a SBC,

Holley 1850, only has one large vaccum fitting that I'm planning to use for the brake booster. There are 3 small fittings left, one will be for the vaccum advance and the other 2 will get plugged

Edelbrock RPM manifold, only has one fitting in the rear of the carb, I have the trans modulator connected there, if I put a tee on it I'll fool the modulator signal.

Now the thing is, there's only one large port but I don't think using a Tee on the brake booster hose will be smart. How about if I use one of the small full vaccum ports of the carb to connect the PCV there? a hose diameter adapter will be needed but that would be no problem, is it absolutelly necesary that the PCV be connected to a large vaccum port?

thanks.

Augusto

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Old 01-20-2010, 10:16 PM
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just put a breather in the valve cover insted of a pvc....
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Old 01-20-2010, 10:28 PM
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Quote:
Originally Posted by n_keiser_rat
just put a breather in the valve cover insted of a pvc....
Then you would need a road draft tube,you should have the pcv in one cover and a breather in the other.
Heres How GM did it on their TBI setups

Shane
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Old 01-20-2010, 11:54 PM
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Pcv Hookup

I've got the same intake and carb on my 350. the PCV valve is tee'd into the brake booster hose and I'm not having any problem what so ever. PCV is on the drivers side cover and the breather/oil fill cap is on the passenger side.
Guess that makes me not so smart!
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Old 01-21-2010, 12:31 AM
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man i have just ran the breathers only before and never had any trouble...no tube or pcv valves... just make sure to replace the breathers when they get dirty or they will get your valve covers dirty
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Old 01-21-2010, 06:08 AM
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Before I put the PCV system back in operation (pre holley) I had chrome breather caps on both covers. I though it looked cool with two caps but, even with the baffles in the covers it forced oil into the breathers only to eventually drip oil onto my chrome covers and build up a white contaminated
goo in the valve covers (Lot's of humidity here in the summer). It wasn't excessive but it made the covers messy. I had to flush out the breather caps about every couple of weeks. I had a choice either get two taller breather tubes, or hook the PCV valve back up. When I put the 1850-2 600 holley on I didn't have much choice as to what vacuum port to use just like you. Another choice was go buy a different vacuum port to screw into the hole on the intake behind the carb with a large port and a small one for the tranny modulator and PCV valve, or drill and tap a new hole in the side of my 1" spacer under the carb. I went for the T fitting as it was cheaper. I don't rev the engine higher than 5,000 rpm on occasion but It works good for me.
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Old 01-21-2010, 06:30 AM
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From the factory, they used a "T" on the manifold for the booster and the trans line....The one at the base of the carb is for the PCV
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Old 01-21-2010, 06:52 AM
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That's the problem. With a quadrajet there's a fitting that screws into the back of the carb for the booster and one on the front for PCV. His Holley only has one large fitting on the base pointing to the passenger side valve cover.
I'm pretty sure I've seen spacers that come with a large fitting that go under the carb. Might want to look for one of those too.
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Old 01-21-2010, 07:35 AM
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if you have room heightwise a Summit one inch spacer has a fitting for PCV.
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Old 01-21-2010, 08:17 AM
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Not seeing the pcv there but PN# 4945 Mr. Gasket carb spacer is what I was talking about. It's ported for 3/8 fitting. $23.95 from summit,
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Old 01-21-2010, 09:01 AM
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The one I posted has a threaded hole, you can plug it or use it.
I used it for awhile until I went to a 2" spacer.
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Old 01-21-2010, 09:58 AM
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I was a little concerned about the fact they didn't mention ported in the discription or show it in the larger image.
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Old 01-21-2010, 10:05 AM
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the modulator valve can go to a small fitting on the carb that has manifold vacuum. It's a good idea to ensure the line rises above the port before heading down to the transmission or the modulator valve will accumulate liquid gasoline and rot the diaphram out eventally. If you use metal tube a 1 1/2' loop up will work.

Use the large fitting on the back of the carb for the PCV, that will distribute the crap you are feeding the engine from the crankcase more evenly. Large fitting on intake use for the brake booster, also make sure the hose or tube goes higher than the intake port, most booster vaccum fittings are higher than the intake however I have seen some that were not and have seen gasoline in brake boosters also.

You don't need a flooding carb. to get the liquid gasoline as the vapor turning back into liquid will accumulate. the factory did those vacuum tube line upward bends for a reason!


http://www.holley.com/0-1850S.asp
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Old 01-21-2010, 11:19 AM
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pcv goes on the large 3/8 carb fitting because:
the fuel metering curve is factory calibrated to include the huge cfm added from the pcv valve to the A/F mix...

the other posts explain the rest...
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Old 01-21-2010, 01:53 PM
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Quote:
Originally Posted by red65mustang
pcv goes on the large 3/8 carb fitting because:
the fuel metering curve is factory calibrated to include the huge cfm added from the pcv valve to the A/F mix...

the other posts explain the rest...

I think you are correct, have tougth a lot about this and I beleive that a tee on the back of the carb is the best place for the brake booster because the trans modulator does not add air to the system thus the vaccum signal is not reduced, both elements can share the same vaccum port, I just need a tee with a reducer for the modulator and a larger nipple for the brake booster.

Pcv will go the holley's intended port, must be there for a reason, just like you red 'stang said.

thanks a lot to everybody for their opinions.

Augusto.
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