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Look what I found in the catch can

Old 09-16-2018, 09:24 PM
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Maxie2U
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Default Look what I found in the catch can

Itís been 6500 miles since I last emptied it. So glad this gunk didnít go into the clean side of the intake.







Let the hate begin...
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Old 09-16-2018, 09:28 PM
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PatternDayTrader
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Looks like oil.
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Old 09-16-2018, 09:40 PM
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Originally Posted by PatternDayTrader View Post
Looks like oil.
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Old 09-16-2018, 10:06 PM
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Here we go again.
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Old 09-16-2018, 10:33 PM
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IMHO, the toilet paper roll goes with the paper over, not under.
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Old 09-16-2018, 10:44 PM
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Quite a bit of oil in 6500 miles. Looks like the catch can is doing its job.
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Old 09-17-2018, 09:42 AM
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Originally Posted by spinkick View Post
IMHO, the toilet paper roll goes with the paper over, not under.
Over for sure!
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Old 09-17-2018, 09:46 AM
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Originally Posted by Maxie2U View Post
Itís been 6500 miles since I last emptied it. So glad this gunk didnít go into the clean side of the intake. Let the hate begin...
You're expecting hate? Naa, the catchcan is doing its job. The question is: did your MPG improve (as previously claimed by Catchcans/Tracy Lewis)?
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Old 09-17-2018, 09:54 AM
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No comment, other than amount of oil pales in comparison to the combustion by-products produced by the 325 gallons of gasoline (assuming 20 avg. mpg) you burned during the same period.

Last edited by Foosh; 09-17-2018 at 09:54 AM.
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Old 09-17-2018, 01:16 PM
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Originally Posted by ImpliedConsent View Post
You're expecting hate? Naa, the catchcan is doing its job. The question is: did your MPG improve (as previously claimed by Catchcans/Tracy Lewis)?
My C7 has always had a CC installed so I can’t say what the mileage was without a one.

I have been on four very long road trips (5000+ miles each) and all of them the CC was installed. Average MPG on those trips was between 29.7 - 30.5.

Last edited by Maxie2U; 09-17-2018 at 01:32 PM.
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Old 09-17-2018, 02:20 PM
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Originally Posted by Maxie2U View Post


My C7 has always had a CC installed so I canít say what the mileage was without a one.

I have been on four very long road trips (5000+ miles each) and all of them the CC was installed. Average MPG on those trips was between 29.7 - 30.5.
The catch can does not affect mileage.
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Old 09-17-2018, 02:23 PM
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I always have to laugh at the ignorance that clever marketing campaigns breed. But it also makes me feel sorry for those that are preyed upon due to their ignorance. Its a vicious cycle all in the name of making money. The ones that make me laugh the most are the Zero Ohm plug wires and the DEI catalytic converter heat shields. Although this catch can nonsense on stock motors is a close third.
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Old 09-17-2018, 02:45 PM
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Is this a design defect for the Direct Injection Engine? That is, not having a catch can device as factory production stock? GM says you might get some discoloration on the valves but does not impact performance. I am debating putting one on my C7. I wonder if it impacts smog testing?
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Old 09-17-2018, 02:52 PM
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Originally Posted by speedlink View Post
The catch can does not affect mileage.
Did not say it does and I tend to agree that itís does not.
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Old 09-17-2018, 05:17 PM
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Originally Posted by ptalar View Post
Is this a design defect for the Direct Injection Engine? That is, not having a catch can device as factory production stock? GM says you might get some discoloration on the valves but does not impact performance. I am debating putting one on my C7. I wonder if it impacts smog testing?
Good luck getting good answers to this question here. It's like a religion to some who say you need one to prevent coking on the intake valves, even though nobody has ever posted a photo of such from a C7 engine. Catch cans and CAI systems have cult-like followers who are never interested in facts or objective evidence.

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Old 09-17-2018, 06:11 PM
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Valve coking comes from the extremely small amount of oil that gets past the valve guides. Everyone knows, the valves move up and down, and there is a vacuum in the intake port, therefore its impossible for valve guides and associated seals to seal perfectly. The only way it could is if the valve was seized in the guide.
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Old 09-17-2018, 07:31 PM
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Originally Posted by Steve_R View Post
Good luck getting good answers to this question here. It's like a religion to some who say you need one to prevent coking on the intake valves, even though nobody has ever posted a photo of such from a C7 engine. Catch cans and CAI systems have cult-like followers who are never interested in facts or objective evidence.
Hard to believe after all this time, no one has pulled the heads and taken a look (maybe for some other reason but still....)
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Old 09-17-2018, 07:35 PM
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Originally Posted by KenHorse View Post
Hard to believe after all this time, no one has pulled the heads and taken a look (maybe for some other reason but still....)
Wouldn't have to pull the heads, just the intake, to use a scope to inspect the upstream side of the intake valves. There have been photos posted here by catch can advocates where that was done, showing coking, but when asked they admit the photo wasn't from a C7. Go figure.

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Old 09-17-2018, 08:51 PM
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Originally Posted by Steve_R View Post
Good luck getting good answers to this question here. It's like a religion to some who say you need one to prevent coking on the intake valves, even though nobody has ever posted a photo of such from a C7 engine. Catch cans and CAI systems have cult-like followers who are never interested in facts or objective evidence.
And yet you never provide any facts yourself just your opinion nor are you interested (and often ignore) objective evidence.

Last edited by Maxie2U; 09-17-2018 at 08:56 PM.
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Old 09-17-2018, 09:05 PM
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Originally Posted by Maxie2U View Post


And yet you never provide any facts yourself just your opinion nor are you interested (and often ignore) objective evidence.
Huh? Provide facts of what, exactly? I have yet to see objective evidence of coking on C7 intake valves, and objective evidence that a catch can would have prevented it. If you have that objective evidence, feel free to post it.



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