catch can on 2007 5.7 hemi

cuhemida · Apr 15, 2014

i have a 2007 hemi in my truck i want to put a catch can on it but haven't found out how yet has anyone done this to there gen 3 hemi get back to me

charonblk07 · Apr 15, 2014

You need to seal off the oem pcv valve with rtf then drill out the passenger side valve cover and install an external pcv valve, the one from a 4.8L vortech will work. Once that's done, install catch can and hoses.

Harley Harrold · Apr 15, 2014

Instead of the trouble of modifying for a catch can on my 07 Hemi, I installed a separate washable cotton gauze air filter in the breather hose connected to the oil filler. The filter is next to the oil dipstick in this photo.

CorDog009 · Apr 15, 2014

You can always do the "Home Depot" catch can if you wanna save some $. Grab an air compressor air/oil separator, a little bit of rubber hose, and a couple of barbed hose ends. $10-15 or so.
This is how we did them on LS1 cars:

hafoster_07 · Apr 28, 2014

So I keep seeing mention of these catch cans...what is the purpose of installing one of these

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usaf2006 · Apr 28, 2014

hafoster_07 said:
So I keep seeing mention of these catch cans...what is the purpose of installing one of these

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Same boat... what are they hah

MyOhFive · Apr 28, 2014

Harley Harrold said:
Instead of the trouble of modifying for a catch can on my 07 Hemi, I installed a separate washable cotton gauze air filter in the breather hose connected to the oil filler. The filter is next to the oil dipstick in this photo.

What did you use to plug the **** on your intake tube?

CorDog009 · Apr 28, 2014

hafoster_07 said:
So I keep seeing mention of these catch cans...what is the purpose of installing one of these

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They catch oil mist that gets out of the crankcase/valvetrain VIA the pcv valve, before it gets a chance to be sucked into the TB and intake, and burned in the cylinders.

charonblk07 · Apr 28, 2014

Harley Harrold said:
Instead of the trouble of modifying for a catch can on my 07 Hemi, I installed a separate washable cotton gauze air filter in the breather hose connected to the oil filler. The filter is next to the oil dipstick in this photo.

You haven't made any difference to the system what so ever with that except removing a hose running across the engine. All you have done is attached a filter to the fresh air make up line, the internal PCV valve is still pulling vapor from the crankcase into your intake manifold.

hafoster_07 said:
So I keep seeing mention of these catch cans...what is the purpose of installing one of those

usaf2006 said:
Same boat... what are they hah

To remove the vapor from the crankcase from the air stream that's routed back to the intake manifold. It keeps your intake manifold clean, reduces carbon build up in the combustion chambers, and less cleaning required on the throttle body.

http://www.ramforum.com/f44/catch_can_results-12085/
http://www.ramforum.com/f44/good_read_explaining_catch_can-39697/

MyOhFive said:
What did you use to plug the **** on your intake tube?

rubber vacuum cap on the hose barb or replace the hose barb with the appropriate NPT plug.

indy05daytona · May 29, 2014

When you do the external PCV mod does the vacuum line just hook to the intake?

Thanks,
Jeremy.

Harley Harrold · May 29, 2014

charonnlk07,

What I did was retain my emission control devices, to pass any state inspections, and I no longer have oily vapor pulled into my CAI duct, just clean cool air, which means I no longer need to remove, clean, and reinstall my throttle body!

HLram · May 30, 2014

I do believe that the pcv part is still putting oily vapor into your intake though. That is a different hose. That one goes to intake airbox. The other one goes to throttle body from pcv.

charonblk07 · May 30, 2014

^^ Correct, as I said, that is the fresh air make up line; the PCV is located at the back of the intake manifold and it's internal to the intake manifold, so it is still pulling oily vapour into the back of the intake manifold and into the engine; it will still coat the back of your throttle body.

You are correct that you aren't pulling any oily vapour into your CAI duct, but that hose should never be pulling oily vapour into the CAI duct if your PCV is working correctly as it's just the fresh air make up line and should always be pulling clean air INTO the crank case. I installed a filter directly onto the hose barb before I did the 6.1L manifold swap, but it didn't stop oil from pooling in the intake manifold from the PCV, which is the point of modifying for a catch can.

Harley Harrold · May 30, 2014

MyOhFive said:
What did you use to plug the **** on your intake tube?

I went to Advanced auto and purchased a vacuum port cap kit that has different size rubber caps. There were two size 5/8" and that is the size that fit my K&N CAI duct perfectly.

HLram · May 31, 2014

I wonder if they (anyone) make a "dry" filter that small for this application? How would a small KnN type oiled filter work there? I also have another question.... last time I cleaned my S and B filter, that hose had an oily residue in it and the male connection on the intake did too. I cleaned my throttle body again because it had a little oil on the back side of it even though I have a BT catch can and I keep it emptied regularly. Does this mean that I need a new pcv valve? My truck has 65,000 miles on it with TONS of idling.

Harley Harrold · May 31, 2014

HLram said:
I do believe that the pcv part is still putting oily vapor into your intake though. That is a different hose. That one goes to intake airbox. The other one goes to throttle body from pcv.

No, my PCV system is internally plumbed, inside the intake manifold, and as long as my engine is sucking air into the manifold, oily reside isn't going to reverse direction to coat my throttle body. I also replace my PCV valve every 30K, I just did it less than 200 miles ago, at 60K. I must retain my emission controls, even though I do fudge on what I can if it helps performance.

charonblk07 · May 31, 2014

I would check out your PCV. If it's working properly then it will always be using the intake manifold's vacuum to pull from the crank case, however in high vacuum scenarios (idle) the PCV is mostly closed as there should be little blow-by so it's not pulling much through which means it's most likely pulling minor vacuum through your make up line to the filter area. This will pull oil vapour into the intake tube, and you would benefit from a filter on the FAMU in this scenario.

Any filter will work on the FAMU as long as its inlet will clamp onto the hose barb. I had a K&N on my '07 and I now have a Green Filter on my '09, both are oiled filters and they get cleaned every 2nd main filter cleaning. A dry cotton filter isn't a must, but if you plan to just throw them away then it's not a bad plan.

charonblk07 · May 31, 2014

Harley Harrold said:
No, my PCV system is internally plumbed, inside the intake manifold, and as long as my engine is sucking air into the manifold, oily reside isn't going to reverse direction to coat my throttle body. I also replace my PCV valve every 30K, I just did it less than 200 miles ago, at 60K. I must retain my emission controls, even though I do fudge on what I can if it helps performance.

When a PCV stops working properly the oil vapour pools in the bottom of the intake manifold and after a while you have visible oil build up. Now, you replace your PCV a hell of a lot more often than 99% of people, so yours is always working correctly so you shouldn't see this problem. Now, something I should note is the biggest culprit for the build up on the throttle body in the 3rd gens is from the EGR, not the PCV.

Harley Harrold · May 31, 2014

charonblk07 said:
When a PCV stops working properly the oil vapour pools in the bottom of the intake manifold and after a while you have visible oil build up. Now, you replace your PCV a hell of a lot more often than 99% of people, so yours is always working correctly so you shouldn't see this problem. Now, something I should note is the biggest culprit for the build up on the throttle body in the 3rd gens is from the EGR, not the PCV.

I am considering an EGR delete kit, but I need to research doing this, before jumping into deleting the EGR valve and plumbing.

charonblk07 · May 31, 2014

An EGR delete is physically simple to do, there's a plate that blocks off the EGR valve and a plug that goes into the port at the rear of the manifold. The big problem is once the EGR is deleted it will throw a code and now it can only be turned off by a CMR and a custom tune unless you have a DS predator with 9r11 or earlier software, a newer programmer won't be able to delete the EGR on its own. It would however be in violation of the emissions laws in places that do have them.

catch can on 2007 5.7 hemi

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