JLT oil separator

MastaAce03 · Mar 14, 2017

Switched out the spark plugs this evening and let's take a look at what we found. Engine was stock and has had the JLT oil separator on the car for most of the cars life according to seller. Needless to say, I just ordered a bobs ultimate oil separator. The oil on the threads of the spark plugs scared me enough to do a compression test. All is well on the compression

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BlksvtCobra01 · Mar 14, 2017

After reading and seeing myself. I'm thinking about ditching my JLT setup. It barely collects anything.

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merkyworks · Mar 14, 2017

What version of JLT was on car?
Both sides or just passenger?
How many miles on car?

BOOCOCKY · Mar 14, 2017

Also, was your catch can collecting oil and this still happened? My passenger side catch fills up rather quickly and gets emptied monthly.

ram150 · Mar 14, 2017

I was in the process of ordering kne, I guess I should go with Bob's ultimate separator? I always heard the JLT 3.0 was a great product.

MastaAce03 · Mar 14, 2017

Passenger side separator only. Car has 11k miles on it. The JLT was definitely collecting a good amount of oil, that's what was getting past it.

I got that ultimate kit, should be the ticket. I don't know what version JLT is on the car since I'm not the one who purchased it.

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Zedeater · Mar 14, 2017

If it was the latest revision, a "3.0" it would say it on the cap & look similar to below. If it doesn't have that 3.0 than it is an earlier version which most owners state wasn't very effective.

fmylife · Mar 14, 2017

My JLT (not 3.0) has been catching plenty of oil...I'm at almost 28k miles now and it's been on since 7k miles. This has me reconsidering it now and changing to Bobs or the new 3.0!

MastaAce03 · Mar 14, 2017

Do it. I'm still pissed to see how much oil was getting through.

Also why I posted pictures. I don't want others with the same "oil separator" thinking they're ok with what they have. Bad things can happen when that much oil gets through.

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MackDombles · Mar 14, 2017

If you decide to pull off the jet, I have a non boosted application that might benefit.

WHT03SVTCOLO · Mar 14, 2017

MastaAce03 said:
Do it. I'm still pissed to see how much oil was getting through.

Also why I posted pictures. I don't want others with the same "oil separator" thinking they're ok with what they have. Bad things can happen when that much oil gets through.

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Wow wonder if JLT would retrofit older to the 3.0? I think it is just a new lid?

spitin venom · Mar 14, 2017

IIRC There are 3 types of JLT catch cans. The first one didn't collect much so they came out with a upgraded filter screen design. Now there is a 3.0 version. My JLT collects a surprising amount of oil for the miles I drive. When I upgraded superchargers my intercooler was super clean so it is definitely doing its job.

KRS · Mar 14, 2017

Just an opinion but I don't think the oil on the threads of the sparkplug is related to the oil separator. Is it possible that the plugs were previously replaced and had some form of never-seize put on them. Any oil getting into the combustion chamber should be burned off during the combustion process.

Fast Ford · Mar 14, 2017

KRS said:
Just an opinion but I don't think the oil on the threads of the sparkplug is related to the oil separator.

I'm with you KRS, I've never taken a set of wet plugs out of my 07. I have a JLT separator on the right side and it works great, it catches plenty of oil and has the improved screen filter.

RedVenom48 · Mar 15, 2017

That oil is probably from a spark plug tube thats sslllooowwlllyyy seeping oil from the head inside the tube. Also possible its anti-seize type agent.

The oil separators keep oil out of the supercharger, intercooler, lower intake, backs of the intake valves and intake runners. Also keeps excessive carbon from building up on the piston domes. If its getting to the combustion chamber, its definitely getting burned.

MastaAce03 · Mar 15, 2017

lexustech48 said:
That oil is probably from a spark plug tube thats sslllooowwlllyyy seeping oil from the head inside the tube. Also possible its anti-seize type agent.

The oil separators keep oil out of the supercharger, intercooler, lower intake, backs of the intake valves and intake runners. Also keeps excessive carbon from building up on the piston domes. If its getting to the combustion chamber, its definitely getting burned.

Could be anti seize, I don't know if the plugs have been changed unfortunately. Why would oil be slowly seeping from the head inside the tube?

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RedVenom48 · Mar 15, 2017

Plug tubes are typically pressed into the cylinder head. Over time a VERY small path of VERY small amounts of oil can get into the plug area from the expansion of the two dissimilar metals (aluminum head, steel plug tube).

It could also be a coating of carbon/fuel mixture sludge. The bevel on teh plug is what seals the combustion chamber not the threads. The combustion process wont necessarily burn things on the threads, but can retain residual fuel/carbon slurry. Over time, like when the engine is shut off, that fuel and carbon vapor cool and can find their way to the spark plug threads.

MastaAce03 · Mar 15, 2017

Makes sense. I appreciate the explanation. The plugs were being run with the factory tune which would explain the possible sludge. Was definitely running super rich from the look of the plugs, which isn't surprising.

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Robert M · Mar 16, 2017

spitin venom said:
IIRC There are 3 types of JLT catch cans. The first one didn't collect much so they came out with a upgraded filter screen design. Now there is a 3.0 version. My JLT collects a surprising amount of oil for the miles I drive. When I upgraded superchargers my intercooler was super clean so it is definitely doing its job.

^^^^That is also what I remember over the last 6 years or so, the 1st design JLT was the 2.0 size reservoir, but the original screen did not separate as well as it should, then there was a separator screen change/upgrade to the original 2.0 reservoir and then it was separating so much better that they (JLT) increased the size of the reservoir to 3.0 so that there was more time between emptying of the reservoir.

If I remember correctly, isn't the newer/finer separator screen available as a retro-fit to the older/original 2.0 JLT housing?

R

BlksvtCobra01 · Mar 16, 2017

If it's available for an upgrade the screen option I'd be interested.

JLT oil separator

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