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For those who purchased both JLT oil catch cans


bergenfelter

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After seeing that there was absolutely no oil in the the driver can after 2000 miles and a tablespoon of oil in the passenger can and some oil in the supercharger inlet - I decided to do a bit of re-engineering... I removed the driver catch can and hardware, added a 1" 3/8 nipple and joined the two cans together - shortened up the passenger outlet tube - now I have two cans in series - we will see how it works - will keep updates coming...

 

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I talked with Jay (JLT) at a car show about the oil catchers and he recommended only the passenger side. He even said that the drivers side in testing didn't accumalate any oil. Interested in your experiment please keep us informed.

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Very nice! I like it!

 

Do u need to put a bottom cap on each JLT's bottom in order to keep the extra can's weight from causing one or both cans to touch the valve cover underneath each can?

 

I saw bottom caps in a pic once of JLT CC's but don't know where to get them.

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Very nice! I like it!

 

Do u need to put a bottom cap on each JLT's bottom in order to keep the extra can's weight from causing one or both cans to touch the valve cover underneath each can?

 

I saw bottom caps in a pic once of JLT CC's but don't know where to get them.

 

 

No - you don't need the caps - the entire assembly is rigid enough it stays about 1/2" off of the valve cover surface.

 

 

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No - you don't need the caps - the entire assembly is rigid enough it stays about 1/2" off of the valve cover surface.

 

 

I would be afraid that the combined unsupported weight of the two cans would eventually cause the failure of one or more of the connectors or connection points, do to stress and vibration.

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  • 5 months later...

So the verdict is in - after about 1000 miles on the tandem JLT setup oil was pooling in the SC inlet. The oil in the catch cans also seemed equally distributed. That being said - I now swapped in the Bob's in CF with the black fittings. We will see how this one goes - and it sure looks nice - matches the JLT CF big intake.

 

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My driver side is also dry as a bone at 1000 miles. The passenger side outlet tube does have oil in it.

 

So, is the JLT not a good filter? Is it just not a 100% filter.

 

Could you fill the canister with another filter medium to help trap more oil, say like steel wool?

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  • 2 weeks later...

I would not put any steel wool in a catch can. First of all it is not designed for that purpose and it is much too thin and can get into your engine. That also goes for scrubbing pads, etc.

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Two cans in line and still getting octane robbing, detonation inducing oil pooling in the SC inlet.... It is almost like the oil is going to get sucked into the intake tract no matter what we do...

 

 

That's not true. I have found the JLT cans only catch roughly 50% of the oil going through. The Bob's is catching 95 - 99%. I tried with them both in series. First 3000 miles JLT was in front of Bob's. Both ended up with approx same amount of oil, (about 5 tblespn) Reversed them for another 3000 miles, the Bobs had roughly 9 tblespns. The JLT had 5 eye dropper drops in it. I feel the JLT has 2 design flaws. First the inlet/outlet are directly across from each other with no offset. Second, The JLT uses the stock small ID hoses. This doesn't allow the flow to slowdown enough to dissipate the oil in the canister.

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Hoping with these results in that Jay will have a comment, or even better a FIX, for those of us that are running the JLT cans. Absent that i will be switching soon. Not in a huge hurry as i had a cervical fusion last week so my car in garaged for 5 more weeks. How about someone linking to Bob's website for those us who are ready to switch? thanks

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Early 2007 members were testing a number of home made type configurations with glass bowls and various filtering media. I believe that someone showed that a configuration with a pre-filter followed by a typical catch can from a auto parts supplier was effective.

 

It seems that today no one uses a pre-filter.

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That's not true. I have found the JLT cans only catch roughly 50% of the oil going through. The Bob's is catching 95 - 99%. I tried with them both in series. First 3000 miles JLT was in front of Bob's. Both ended up with approx same amount of oil, (about 5 tblespn) Reversed them for another 3000 miles, the Bobs had roughly 9 tblespns. The JLT had 5 eye dropper drops in it. I feel the JLT has 2 design flaws. First the inlet/outlet are directly across from each other with no offset. Second, The JLT uses the stock small ID hoses. This doesn't allow the flow to slowdown enough to dissipate the oil in the canister.

 

 

 

How do you know how much oil vapor is being recirculated in order to come up with these claims of 50% or 99% capture rate? You know how much you are capturing from one design or another, but to give a percentage implies that you know the actual volume of oil being recirculated as vapor. THAT is just simply not true.

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How do you know how much oil vapor is being recirculated in order to come up with these claims of 50% or 99% capture rate? You know how much you are capturing from one design or another, but to give a percentage implies that you know the actual volume of oil being recirculated as vapor. THAT is just simply not true.

 

 

If they are in series with each other and both catch approx the same amount of oil, that would tell me the one in front is only catching 50%. Unless the 2nd was also passing oil. Since I reversed them, I found that the Bob's only passed a few drops after 3000 miles.

 

Bob's in front = 9 tblespns in bob's, a few drops in JLT = 99% catch rate for Bob's.

JLT in front = 5 tblespns in JLT, 5 tblespns in Bobs = 50 % catch rate for JLT.

 

No the percentages may not be 100% accurate, but the results speak for themselves. The JLT is letting a lot of oil get by. The bob's isn't. What is so hard to comprehend?

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If they are in series with each other and both catch approx the same amount of oil, that would tell me the one in front is only catching 50%. Unless the 2nd was also passing oil. Since I reversed them, I found that the Bob's only passed a few drops after 3000 miles.

 

Bob's in front = 9 tblespns in bob's, a few drops in JLT = 99% catch rate for Bob's.

JLT in front = 5 tblespns in JLT, 5 tblespns in Bobs = 50 % catch rate for JLT.

 

No the percentages may not be 100% accurate, but the results speak for themselves. The JLT is letting a lot of oil get by. The bob's isn't. What is so hard to comprehend?

 

Your logic is fascinating on some level, but it is entirely incorrect. Your logic disregards basic scientific theory.

 

You are speaking in percentages about how efficient the different catch cans are at re-capturing the oil. You logic and testing can correctly proclaim that one vendors design captures some percentage more oil than the other, but without knowing the total amount of oil moving through the system you can not proclaim that one or the other is capturing some percentage of the total oil. You would have to know the total oil available for capture in order to calculate an overall recapture "efficiency" percentage.

 

To put it another way, Bob's can captured 9 tblespns out of what total available oil that was being recirculated? 9 tblespns recaptured out of 10 available tblespns is significantly more efficient than 9 tblespns recaptured out of say a quart of oil.

 

Do these devices distill oil from oil vapor? Yes. Do they distill enough of the overall volume moving through the system to be effective in some way? Unknown.

 

If 9 tblespns over 3,000 miles only represents say 10% of the oil that is being recirculated, then you are still burning 90% of the oil vapor that is present.

 

The goal of these devices is to stop burning oil vapor. Without know how effective or efficient they are, it is impossible to empirically justify the mod. They could be removing 1% of the oil vapor or 99%. The point is that we do not know.

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Interesting....subscribing.

 

 

Yeah, ditto.

 

After seeing the recent 'test' by Bob's, I'm inclined to buy a JLT or Bob's. I like the JLT over the Bob's but mainly because visually is is more pleasing to the eye.

 

But on the other hand, I really like the Bob's over the JLT because it appears to be more functional (even by Jay Tuckers admission).

 

I'm *normally* not a form over function kind of guy but IN MY (educated) OPINION, a PCV catch can isn't so much a "need to have" item as it is a "nice to have" item.

 

I say that because NO ONE has shown ANYONE ANY proof that a oil coated intercooler is detrimental to the performance of a Supercharged engine. It's all purely anecdotal so far.

 

 

Phill

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I agree we don't know exactly how much oil vapor is being circulated, but I believe I am not wrong in saying that Bob's catches twice as much as JLT, at the very minimum it catches substantially more than JLT. If you in your great wisdom could prove differently, or suggest another method to test I am fully open to it. I have nothing against JLT, they are a great company, with great customer service. I even prefer the "factory look" of their separators much more, but the bottom line is I prefer Function over Form, thats why I did this test. Jay Tucker (owner of JLT) has admitted his separators don't catch as much as Bob's, and has started to design improvements to his product since the initial findings of similar test in recent months. I will be watching his design changes carefully and will retest when he corrects any difficencies in his product.

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No great wisdom here, just trying to apply sound science. I absolutely agree (and stated as much above) that your testing proves that Bob's can captures more oil than JT's. However, you did previously state that Bob's can has a "99% catch rate" and that the "JLT is letting a lot of oil get by. The bob's isn't." My point was that this has not been proven in any way by anyone.

 

I have been very clear on this forum and others that I have yet to see any sound science that this mod accomplishes its purpose, which I believe is to stop or greatly diminish the recirculation of vaporized oil into the intake tract. Does it reduce the amount of oil that is recirculated, absolutely.... by at least 9 tablespoons over 3000 miles evidently. To this I say, so what. If I am still recirculating enough oil to coat the intercooler etc..., what have I accomplished? Nothing. Without knowing the true percentage of overall reduction in oil recirculation, we have no way of evaluating this "mod".

 

Someone needs to show us two intercoolers after say 25,000 miles. One that used a catch can and one that didn't. I'll bet anyone here a beer (I'll even spring for a Stella) that they look exactly the same with basically the same level of fouling.

 

As I have also stated before, I don't believe that this mod is guaranteed to be warranty friendly. Messing around with a "mod" on the PCV system on a $31k engine with little or no data that it actually does anything truly useful, seems like folly to me.

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Yeah, ditto.

 

After seeing the recent 'test' by Bob's, I'm inclined to buy a JLT or Bob's. I like the JLT over the Bob's but mainly because visually is is more pleasing to the eye.

 

But on the other hand, I really like the Bob's over the JLT because it appears to be more functional (even by Jay Tuckers admission).

 

I'm *normally* not a form over function kind of guy but IN MY (educated) OPINION, a PCV catch can isn't so much a "need to have" item as it is a "nice to have" item.

 

I say that because NO ONE has shown ANYONE ANY proof that a oil coated intercooler is detrimental to the performance of a Supercharged engine. It's all purely anecdotal so far.

 

 

Phill

 

 

Phill - I went with the Bob's in CF finish with the black plumbing - actually looks pretty good - esp with the JLT CF big intake. I was a bit skeptical too on appearance of the Bob's - IMHO after installation looks pretty good. See my pic earlier in this thread.

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