Just installed the JLT and it looks fine. The hoses are stout enough that it is not going to flop around. I waffled between Bob's, Moroso but ended up JLT. It will do the job.

 

Yeah, I looked hard at the JLT because of the price mostly, and it got pretty decent reviews, but the aforementioned leak issues/rumors gave me cold feet and I spent a little more for the Moroso...almost wondering if the lack of a bracket and the leak issues are possibly related?

Also picked up an extra OEM PCV pipe to strip the connectors off of, so I'll be ready to go when the big day gets here, and get to retain the original pipe that comes on the car in the event of an emergency.

 

I think the bigger issue with the JLT is that it doesn't seem to catch much oil compared to the other two and lets more oil through to the intake. They supposedly did something to the newer ones to fix this but I can't remember what. Their capacity is also very small compared to the other two which means you may have to empty it more often if the newer version works better than the older ones.


Wayne

 

I had not read that about the JLT not catching as well. I hope they did fix it but I will keep an eye on it. Thanks for the info.

 

Let us know how that JLT works!
Run it for 250 to 300 mi. Then check how much oil is in the can and then take off the line at the intake and see if it has any oil in that line!
I have had my Moroso on for 1000 miles so far and no oil in the intake!

 

No problem. I did a little research and it seems that the improvements JLT did to their catch cans are only for select applications and it seems like the GT500 applications are the ones that were improved. It doesn't seem like the regular 5.0 GT applications for the passenger side was improved.


It looks like from pictures of the JLT, that the inlet hole is smaller than the outlet hole and that the original cans have a filter in the outlet hole. The improvement was taking out the outlet hole filter and putting in their new inlet hole filter.


Do you know if your can has a small filter or the large one?


Wayne

 

I'm a skeptic on this one. A few drops of oil in the intake every few hundred miles does what? I don't understand the need for these. PVC venting into an intake has been done for years (like since the 70's).

Does anyone have a link to an article that shows the detriment of oil getting into the intake? Or can point me to another link on this forum with some facts? I did a search, but can't find any real data (just people concerned there is oil in their engine).

Edit: Oh, and sorry this is a bit off topic (not talking about which one to select). I just want to find some data (maybe I should have started a new thread... but I already hit send before I thought of that).

 

That's a great question, and I've never actually found a hard study done specifically on this. I've mostly gone by anecdotal evidence from tuning shops dealing with turbocharged Subaru's, and how adding a catch can/separator allowed a particular engine to run a little more timing and get a little more out of it.

Crawford Performance takes it to another level and actually designed theirs with a coolant jacket that comes off the turbo to heat the can to improve oil separation....but they're also known for making rediculous power out of very tiny engines. For that, you need big boost, and there's a ton of crankcase pressure to deal with, some oil is going to push through.

I was initially surprised to see as much attention to oil separators in non-boosted Mustangs as there was. But having come from a world where they're pretty commonplace, and the relatively reasonable price for a measure of protection, I'm onboard.

 

I work at a major dealer ship ( brand X japan) and oil in the intake does several bad things!
It coats sensors in the intake, which changes there readings, it builds up and causes obstructions, and oil mixed with fuel drops the fuels octane level!

And these cars have a lot of oil coming out the pass. side Pcv, I'm getting about 1 tsp. of oil every 150 mi. That doesn't sound like much but it is! And when that goes on for thousands of miles it causes the above issues mentioned.

In my opinion this should be everybody's first mode!
Especially if you rev your engine up frequently!

 

Would you ideally want to put a catch can on both sides of the engine then?

 

Can't remember where I read it, but it said roughly 80% of the oil making its way to the intake comes from the passenger side. So for cost reasons you're mostly resolving it by doing that side. But if you're boosted, you'd want to do both.

 

Still kind of weird reasoning on the forum.... "Oil is horrible and it robs power. Even a little oil is bad and is going to ruin your engine and the sensors"... then, Oh, but it's OK on the drivers side. A little oil doesn't hurt...People are saying conflicting things with no data to back up either view in any thread I've found on the forum. I'm still a skeptic when it comes to spending money on this. Seems like placebo to make people feel better?

 

One tube is larger making it the natural 'exhaust side' of crankcase pressure (path of least resistance), the other tube is much narrower - very little oil passage but still providing needed air flow. The larger/smaller tube scenario provides an airflow through the larger tube (that Ford does not put a one way valve [PCV] in like most cars that would facilitate drain back) where atomized oil/fuel blow by can be captured by the oil separator.

Ever rebuild an engine?
Go ahead... bake that crap on... to intake, ports, (4.6L3V and 15+ 5.0 butterflies of CMCV), valves & valve stems - all of which are outside the combustion chamber where it cannot be burned off. It also negatively affects A/F ratio (post MAF) and some say can lead to detonation issues (which hypereutectic pistons do NOT like!).



4.6L3V at just 15k miles:

 

Keep in mind your 68 has an open breather tube right? Late 70's/80's plugged that into the air cleaner. My 83 F150 not only has a PCV tube (with an actual one way valve), plus the valve cover breather tube is plugged into the air cleaner with its own filter - that has to be changed regularly.

My 4.6L3V (same for the 5.0) has neither a PCValve or a filter where the cam cover breather tube is connected to the intake tube.

An Oil Sep (properly designed for crankcase air flow) resolved these design/pollution control issues so your engine does not bake atomized oil/fuel blow by on the intake and valves, yet still captures & recycles (burns) the crankcase air (minus oil/fuel) for pollution control.
Just like your 68 didn't bake these crankcase gases on your intake and valves (although released them to the atmosphere).

Oil Sep = Win Win! (with only the minor inconvenience of draining the sep)

 

Cdynaco, great explanations, for why you should have a air/oil separator!

 

Yep, standing ovation for that write-up.

 

Sorry to get back so late on this. I have the small filter one, so I will just watch it and see how good a job it does.

I would not want any oil in my fuel/air mixture. I don't want my intake varnished. The insurance of purchasing/using a oil separator is nothing for what you have invested in your car and wanting it to run the best possible.

 

Sounds like you have the new version then. I will be interested to see how much oil it captures.


Wayne

 

This is after 5500 miles with the new JLT...it's about 4 ounces worth.

 

If you have a jlt, check the hose going back into the intake manifold, the 3 cars I personally saw with the jlt's still had oil in that line!
But they were the old jlt separators!
Mine and the other car that I looked at with the moroso had none!
I'm wondering if the new jlt separators are better than the first ones!