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Oil catch cans are they needed?

64811 Views 83 Replies 39 Participants Last post by  sagonzal2000
Was wondering what everyones opinion was on oil catch cans? Do you need them and if so On passenger side of engine or drivers side of engine or both?
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To report back on my JLT (passenger side) oil catch can. I just checked it yesterday and after approx. 400 miles the can was about 20% filled. While I didn't expect that much oil with only 400 miles, very happy that's not being sucked back into the intake/valves/combustion chamber. The car doesn't appear to be burning any oil (I have about 900 miles on it to date) as the oil level is still showing right at full.
But the Ford unit looks finished and secures to valve cover.

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This is a great thread, I learned a lot.

I just ordered both the driver's & passenger's side Ford kits
I just ordered both Ford kits also. Like the factory look. Had the JLT ones on my 07 Mustang. The JLT ones work great and fit well. Just wanted to go factory this time.
Jim I noticed that you inverted the upper hose too (opposite what the installation instructions show). Any issues that you’ve noticed? I just installed my FP can yesterday and found that inverting the hose is a lot less work and no kink at the 90 degree bend. Thanks.
Hello. Sorry for being ignorant, but what the heck is this catch can thing? Just purchased GT350 2 weeks ago....and not sure what this is for, etc?.. need Catch Can for Dummies” lesson please.
The crankcase in any engine creates a positive pressure internally. Most seals, gaskets, and such aren’t designed for a pressurized system. That pressure needs to be vented. Back in our dads day, that’s pressure was vented out of the crankcase via a breather cap of some sorts straight to atmosphere. Along comes the late ‘70’s and the EPA and decides that’s not so good for the environment. So, that pressure is vented through a PCV valve (positive crankcase ventilation) back into the intake track somewhere, into the combustion chaimbsr, and out the exhaust pipe. Cleaner for the environment than venting straight out to atmosphere. Since it’s plummed into the intake, it also has the added benefit of creating a slight vacuum to draw that pressure out of the crankcase. This is a good thing for seals and rings.

The bad part is, along with the venting and the vacuum, that air being drawn from the crankcase contains quite a bit of oil mist suspended in the air. The oil ends up in the intake, coating everything in a layer of oil. Especially bad where and when it gets baked to the top of intake valves. The oil also wreaks total havoc on the octane rating of your fuel since it ends up in the combustion chamber.

These catch cans have a metal plate, screen, or some other clever design that unsuspends the oil from the air traveling through. Designs vary, but the basic function is the same. The component that removes the oil, collects it in this “catch can”. The oil content falls out of suspension from the traveling air and clean air continues on into the intake after passing through the can.

It probably doesn’t remove 100% of the oil, but probably darn near close. Enough to make them a valuable asset, and a mandatory first mod IMO.
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Nice explanation galaxy.
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To report back on my JLT (passenger side) oil catch can. I just checked it yesterday and after approx. 400 miles the can was about 20% filled. While I didn't expect that much oil with only 400 miles, very happy that's not being sucked back into the intake/valves/combustion chamber. The car doesn't appear to be burning any oil (I have about 900 miles on it to date) as the oil level is still showing right at full.
Roughly the same experience with my pass side JLT.
Ok. Cool. So is this needed if just a DD? No track use, etc? Also, do you need dr and pass side? Any warranty issues? Thx!
Mine's also a DD and I'm installing a pass side JLT only.
Ok. Cool. So is this needed if just a DD? No track use, etc? Also, do you need dr and pass side? Any warranty issues? Thx!
Yes; any and every car benefits from a catch can regardless of use. That oil is always there regardless of use, RPM, driving habits, etc. Always a benefit. Just right (passenger) side. Left side doesn't do diddly squat except under the most extreme track conditions. Most guys with a can on the left report that it's completely bone dry.
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Yes; any and every car benefits from a catch can regardless of use. That oil is always there regardless of use, RPM, driving habits, etc. Always a benefit. Just right (passenger) side. Left side doesn't do diddly squat except under the most extreme track conditions. Most guys with a can on the left report that it's completely bone dry.
Ditto, I'd install one on the passenger side - always a benefit and they are an inexpensive insurance policy!!

Besides, once you rev this amazing FPC to 8K RPM's you'll be addicted :)
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Seems that Ford Performance hasn’t made a passenger side catch can for 2018 models yet....
Seems that Ford Performance hasn’t made a passenger side catch can for 2018 models yet....
Yes they have. They’re all the same.
Question:

So I have the Ford catch cans installed both driver & passenger sides..
How do you remove them for inspection/drainage?
I don't want to remove more than I have to and I'd rather get some advice before tinkering..

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Auto Fanatic has a detailed video

[video=youtube_share;qpewQiNlGPU]https://youtu.be/qpewQiNlGPU[/video]
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Ok. Cool. They have ‘18 drivers side, no ‘18 passenger....but, can use the ‘17 nonetheless?
Ok. Cool. They have ‘18 drivers side, no ‘18 passenger....but, can use the ‘17 nonetheless?
Yes, it's the same

J
Yes, that’s what I (we) just told you...they’re all the same.
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