Best PCV hose connection? Intake manifold or Carb?

Great68

Founding Member

May 16, 2002

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Victoria BC

Aug 19, 2004

#1

• Aug 19, 2004

• #1

I was just wondering what would be the better location for the PCV hose to plug into. Right now I have it going into the back of the intake manifold, but a friend told me it is better to put it to the carb because this way it more evenly distributes over all the cylinders.

It makes sense. What do you guys think?

 

D

D.Hearne

New Member

Sep 29, 2000

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south louisiana

Aug 19, 2004

#2

• Aug 19, 2004

• #2

Either way is good.

 

O

Ozsum2

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Jul 28, 2004

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Aug 19, 2004

#3

• Aug 19, 2004

• #3

What D said.

 

R

Ronstang

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Apr 4, 2004

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Houston Texas

Aug 19, 2004

#4

• Aug 19, 2004

• #4

For once I will disagree with D. Hearne. If you plumb the PCV into one runner in the intake like most threaded ports are in aftermarket units then you are fouling only one cylinder and it can affect the plug and overall cylinder temp of that single cylinder so it is always better to plumb the PCV into the carb or a spacer underneath it that will distribute the gases to all cylinders.

 

Route666

Active Member

Aug 16, 2003

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Brisbane, Australia

Aug 20, 2004

#5

• Aug 20, 2004

• #5

I agree with Ronstang.

Although, unless you take the source from the very middle of the intake charge of the carb, it will most likely still effect some cylinders more than others. Most likely this will be a lot more negligable than being hooked to the manifold, but it still exists.

 

D

D.Hearne

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Sep 29, 2000

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south louisiana

Aug 20, 2004

#6

• Aug 20, 2004

• #6

Ronstang said:

For once I will disagree with D. Hearne. If you plumb the PCV into one runner in the intake like most threaded ports are in aftermarket units then you are fouling only one cylinder and it can affect the plug and overall cylinder temp of that single cylinder so it is always better to plumb the PCV into the carb or a spacer underneath it that will distribute the gases to all cylinders.

Click to expand...

That's really only going to happen if you have a really bad blow-by problem or if you have no valve cover baffles to shield the PCV valve, if that's the case, then yes, it needs to go into the carb base. I've plumbed it both ways, and never seen a difference either way. Use which ever port is convenient.

 

Max Power

Active Member

Jul 31, 2003

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St Paul

Aug 20, 2004

#7

• Aug 20, 2004

• #7

Agree with Ronstang.

 

O

Ozsum2

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Jul 28, 2004

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Aug 20, 2004

#8

• Aug 20, 2004

• #8

Still agree with D. I really shouldn't matter. I run mine off a carb spacer.

 

BobV

20+ Year Stangneter

May 18, 2003

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Leavenworth, KS

Aug 20, 2004

#9

• Aug 20, 2004

• #9

I agree with your friend, better at a central point, like under the carb.

When the new engine went in my car, I ran the PCV to the intake runner on an old Shelby intake. Cylinder #8 sparkplug was always extremely lean, and #3 was somewhat lean. The rest of the plugs were perfect. Later changed to a carb spacer setup, and all cylinders are now even. The extra "air" being pulled thru the PCV will lean out one or more cylinders if hooked up to a runner

 

oz

Founding Member

Jun 29, 2000

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Plymouth, MI

Aug 20, 2004

#10

• Aug 20, 2004

• #10

When I started my newly rebuilt 302, I had a PCV plumbed from the valve cover to the threaded port going to runner #8... well the PCV sucked oil (no baffle) so I got a lot of white smoke from the left pipe until I disconnected this PCV...
...so I would recommend attaching it to a carb port if one exists. The manifold is always the second choice if needed.

 

WORTH

20+ Year Stangneter

Nov 18, 2002

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98

Cape Cod, Ma.

Aug 20, 2004

#11

• Aug 20, 2004

• #11

Great68 said:

I was just wondering what would be the better location for the PCV hose to plug into. Right now I have it going into the back of the intake manifold, but a friend told me it is better to put it to the carb because this way it more evenly distributes over all the cylinders.

It makes sense. What do you guys think?

Click to expand...

I agree