PCV setup for FI

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Oct 5, 2010 | 10:49 AM

Deslok

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Pro

Joined: May 2001

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From: Alpharetta GA

PCV setup for FI

What's the preferred setup for PCV on a FI engine?

I have the TTIx system, and, when I engine brake hard (like on a long downgrade road), I get oil into the system and smoke out the back.

Clears up pretty quick afterwards, but, don't like laying a James Bond smoke screen down a mountain.

Catch Can? Multiple check values? Did a search and can't really tell which way to go.

Thanks

Oct 5, 2010 | 12:08 PM

0Cajun @ Edgyvette

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From: Tampa FL

St. Jude Donor '07-'08-'09-'10-'11-'12'-'13-'14-'15

ORDER HERE: https://sites.google.com/site/barees...cing1/products

PCV tube stands for the Positive Crankcase Ventilation tube (PCV). It's used to vent any pressure built up in the head of the engine, but since we have emissions laws, that venting means that the gasses must be properly burned to prevent excess pollution. This is done by sending the gasses back into the engine through the intake. When this occurs not only will the engine have a pushing pressure, the intake will also have a sucking action working on the tube. This results in a force so great that gasses AND oil will be transferred from the engine and into the intake manifold. In other words, it results in burning oil.

What's bad about burning a little oil? As oil gets sucked in, the throttle body, intake manifold, cold start fuel injector, and T-VIS butterflies develop a thick oily residue which coats everything it touches. When the tiny particles of dust and dirt that make it past the air filter come in contact with that oil, they bond together making a thick sludge. In the most severe cases, this can lead to the complete failure of the T-VIS system when the butterflies get so gunked up they can no longer open and close properly. The bad part about getting the throttle body dirty in particular is that it has sensors within it that contribute to the info the ECU needs to properly run the engine. Those sensors can't operate properly if they're covered in an oily residue. I'm not certain how bad it is for the cold start fuel injector, but I'm fairly certain the injector wasn't designed to operate while covered in crap.

The solution is to clean the throttle body, injectors, and intake manifold periodically to insure that the oil residue is removed, or you can remove the oil BEFORE it enters into the throttle body/intake manifold. This can be done using a PCV catch can.

Oct 5, 2010 | 03:04 PM

D C

USMC (retired)

Joined: Aug 2004

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From: Wimauma FL

where would you place one on a supercharged car? For those that have the YSi and have one please step in with pictures and how to

Oct 5, 2010 | 03:10 PM

0Cajun @ Edgyvette

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Joined: Mar 2003

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From: Tampa FL

St. Jude Donor '07-'08-'09-'10-'11-'12'-'13-'14-'15

Quote:

Originally Posted by D C

where would you place one on a supercharged car? For those that have the YSi and have one please step in with pictures and how to

You can mount the can wherever you have space and can supply in and out lines to it. I have a special for $99 shipped on billet cans right now. I will provide you with the extra hose needed for wholesale cost.

I would keep the hoses as short as possible and would suggest mounting on the front shroud or on the firewall away from heat.

Cajun

Oct 5, 2010 | 04:16 PM

5 Liter Eater

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From: Houston TX

St. Jude Donor '11

Here is the routing for an LS1 w/ a centri unit. I have others if needed.

Oct 5, 2010 | 04:29 PM

Deslok

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From: Alpharetta GA

Would a twin tubro on LS6 differ from the LS1 setup?

Oct 5, 2010 | 06:32 PM

Warp Factor

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From: Metro Detroit Michigan

Smoking on extended decel? I'm not sure that's a crankcase ventilation problem.

Valve stem seals, maybe?\

Disconnect the PCV hose from the intake (plug the opening at the intake) and see if it still happens

Last edited by Warp Factor; Oct 5, 2010 at 06:38 PM.