Catch can for pcv good/bad??
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Posting Guru
Joined: Nov 2004
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From: sunny fla sometimes windy
Catch can for pcv good/bad??
I have been thinking of putting a catch can on my 302 to catch any oil
that gets by the pcv valve. I have seen where they recommend moving
the pcv valve from the back of the intake so the crap that gets by is
spread between the cylinders instead of the rear two. I have some
aluminum bottles and was wondering what to do with them and thought
they would work good for this. Not only would it help my motor but also
the environment also I guess. What do you all think?
that gets by the pcv valve. I have seen where they recommend moving
the pcv valve from the back of the intake so the crap that gets by is
spread between the cylinders instead of the rear two. I have some
aluminum bottles and was wondering what to do with them and thought
they would work good for this. Not only would it help my motor but also
the environment also I guess. What do you all think?
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Posting Guru
Joined: Nov 2004
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From: sunny fla sometimes windy
My act always has some build up on it and the intake in general, I remember seeing
somewhere they blocked off the pcv valve on the back of the intake and drilled a
new hole and ran it to the center to distribute the blowby since the crap is hard on
the rear cylinders. The bottles i have are like 10" tall by 8" and have a threaded
neck and are anodized blue.
The 86 302 is fuel injected. I'm not getting any smoke from the motor at all but a
fine mist does come from the oil fill and the pcv if I take it off while running.
I get a nice vac reading on the motor and the comp. test I did when I bought the
truck many moons ago was fine. I put it on the vac on a regular basis and go by
that mostly to gauge my motor wear.
somewhere they blocked off the pcv valve on the back of the intake and drilled a
new hole and ran it to the center to distribute the blowby since the crap is hard on
the rear cylinders. The bottles i have are like 10" tall by 8" and have a threaded
neck and are anodized blue.
The 86 302 is fuel injected. I'm not getting any smoke from the motor at all but a
fine mist does come from the oil fill and the pcv if I take it off while running.
I get a nice vac reading on the motor and the comp. test I did when I bought the
truck many moons ago was fine. I put it on the vac on a regular basis and go by
that mostly to gauge my motor wear.
Senior User
Joined: Dec 2007
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I put one on my GTO. The position of the PCV hose in the LS2 causes it to draw excess oil into the engine. GM is aware of the problem, but they didn't recommend a fix, they just advised that I check the oil level more often.
Catch cans are easy enough to make, I found the plans for mine at the LS1/2 GTO forum. In a pinch, a large plastic fuel filter (transparent type) would work, and you would be able to tell how much oil was accumulating just by looking at it.
Catch cans are easy enough to make, I found the plans for mine at the LS1/2 GTO forum. In a pinch, a large plastic fuel filter (transparent type) would work, and you would be able to tell how much oil was accumulating just by looking at it.
Fleet Owner
Joined: Sep 2005
Posts: 28,609
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From: Lake Tahoe, Nevada
Here is a pretty good design. If you have any fabrication skills, it would be super cheap too.
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Fleet Owner
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From: Lake Tahoe, Nevada
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MSEE
Joined: Apr 2004
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From: Austin, TX
On my '77 LTD, I had to take the hose off that goes from the valve cover to the air cleaner because it kept fowling breather filters and throwing oil. I ran a heater hose down to the ground and dump it straight out. The car runs great, it just has pretty bad blow-by. It's not the first old Ford to do that and won't be the last. Join the club.
Post Fiend
Joined: Jan 1997
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From: Enjoying the real world.
I just finished making a system using an air/water separator from Home Depot on my truck. Its a good modification for any vehicle which vents the valve covers back into the intake system, even better on blower systems. After one day of testing there was already a thin film of oil collecting in it, which is oil which won't go into the intake to coat the intercooler, foul the plugs, build-up on the valves and other surfaces.
An air/oil separator will usually do a better job than a plain catch-can and costs about the same (about $20-$30), plus you can see the oil level and drain it very easily. If you go with a catch can put a large steel "sponge" (I don't know the proper term for it) in the can. It will help separate the oil much better without making a major impact on air flow.
One thing I remember about Texas (I commented about it to my wife when we were there) was the emissions stench on the freeways compared to here in Atlanta.
An air/oil separator will usually do a better job than a plain catch-can and costs about the same (about $20-$30), plus you can see the oil level and drain it very easily. If you go with a catch can put a large steel "sponge" (I don't know the proper term for it) in the can. It will help separate the oil much better without making a major impact on air flow.
One thing I remember about Texas (I commented about it to my wife when we were there) was the emissions stench on the freeways compared to here in Atlanta.
Fleet Owner
Joined: Sep 2005
Posts: 28,609
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From: Lake Tahoe, Nevada
Yes, and if you can't find those old steel "scrubby things" you can fold and roll some coarse screen in your cannister. It also serves to block a flame front caused by a backfire from traveling into the crankcase.
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Posting Guru
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From: sunny fla sometimes windy
YEah those steel scrub things I should be able to stuff enough through the neck (3/4")
I have some brass fittings and plan on using them to pipe the pcv in and out through
the bottom of the can since it is nice and flat and put the opening on the bottom so I can unscrew the top and let it drain out every now and then!! I already have the crap
laying around to do it and just figured since the bottle is anodized ford blue it would look good under the hood.
I have some brass fittings and plan on using them to pipe the pcv in and out through
the bottom of the can since it is nice and flat and put the opening on the bottom so I can unscrew the top and let it drain out every now and then!! I already have the crap
laying around to do it and just figured since the bottle is anodized ford blue it would look good under the hood.
Senior User
Joined: Dec 2003
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From: Saskatoon, Saskatchewan
Sorry to be dense, but what's the original application, that is to say, what aisle do I wander down at HD if looking for an air/water sep?
Thanks!
Lead Driver
Joined: Nov 2000
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From: Albuquerque
I used a small oil trap for an air compressor in line with the PCV hose. Also added a restriction to the supply air line to reduce the voluum of air for better idle. It however traps about a half teaspoon of oil when you first use it and then doesn't trap any more. Maybe it's clogging up. It's a common mod on super charged engines.