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Old 07-19-2015, 08:53 AM   #1
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Crankcase breather musings

So I'm outside looking at my engine doing what many of us do, thinking what next? I've been wanting to pick up a JLT Oil Separator for a while. It occurred to me that on an old Datsun 240Z I used to have, had its crankcase breather being a small filter shaped like the one on a CAI but maybe two inches tall. Going this route begs three questions I'm thinking.

1) Will the filter get saturated with oil so quickly that it will defeat its purpose?

2) Plugging off the space where the PCV attaches to the intake: will that mess with the car's computer as the MAF sensor won't be calibrated for the reduction of air, although slight?

3) My mind is thinking crankcase internal air pressure. I don't know if this matters or not just something that makes one eye squint in thought.

If this was something worth doing, I'd think there would be a bunch of aftermarket companies making these crankcase filters for v6 mustangs which they are not. This is certainly not something new. My old Datsun with the breather was a 71'. For our cars; bad idea or someone always has to be first?

Thoughts anyone?
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Old 07-19-2015, 09:16 AM   #2
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I know when some people put the GT Sound tube on our 3.7s, they put a breather filter on the driver's side crankcase. Haven't heard any issues with that. But since the passenger side is the bad one, may be best to get more opinions. I bought the JLT Catch Can myself.
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Old 07-19-2015, 09:58 AM   #3
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Quote:
Originally Posted by Hampton CIT View Post
So I'm outside looking at my engine doing what many of us do, thinking what next? I've been wanting to pick up a JLT Oil Separator for a while. It occurred to me that on an old Datsun 240Z I used to have, had its crankcase breather being a small filter shaped like the one on a CAI but maybe two inches tall. Going this route begs three questions I'm thinking.

1) Will the filter get saturated with oil so quickly that it will defeat its purpose?

2) Plugging off the space where the PCV attaches to the intake: will that mess with the car's computer as the MAF sensor won't be calibrated for the reduction of air, although slight?

3) My mind is thinking crankcase internal air pressure. I don't know if this matters or not just something that makes one eye squint in thought.

If this was something worth doing, I'd think there would be a bunch of aftermarket companies making these crankcase filters for v6 mustangs which they are not. This is certainly not something new. My old Datsun with the breather was a 71'. For our cars; bad idea or someone always has to be first?

Thoughts anyone?

1. It depends on your driving habits, auto vs standard / how much you engine brake, and how much power you're making to determine how much blow by you have.

2. Not sure what you mean by "reduction of air." Air enters the crankcase from the drivers side valve cover from the intake - this is Post MAF - and goes through the crankcase, out the passenger side valve cover and into the intake manifold. If you put just a breather on the drivers side PCV, or the oil fill cap, and leave the passenger side connected to the IM, you will be pulling in unmetered air and create a vacuum leak. The system either needs a breather on both sides, or to be left in the stock configuration.

3. Yes, venting the crankcase will reduce CC pressure. It will also mean that your engine seals, piston rings, etc are no longer subject to vacuum, so there's something to consider there as well. There are differing schools of thought, so you can make your own decision on that, as there have got to be 100x catch can threads covering that by now.
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Old 07-19-2015, 10:15 AM   #4
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I have the JLT Oil can on my Passenger side and the CFM Breather on my drivers side and no problems at all. My JLT still picks up oil blowby and the breather cap is "NOT" saturated with oil.
I have had this setup for 17,000 miles and my car does not used oil between 7,500 mile changes so I guess everything is alright.




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Old 07-19-2015, 10:45 AM   #5
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I have the JLT Oil can on my Passenger side and the CFM Breather on my drivers side and no problems at all. My JLT still picks up oil blowby and the breather cap is "NOT" saturated with oil.
I have had this setup for 17,000 miles and my car does not used oil between 7,500 mile changes so I guess everything is alright.




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If that oil cap breather has a check valve, then yes, everything will be alright as far as vacuum leaks are concerned during DD. I suppose i should have clarified in my original post.
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