This product injects into the intake system and will put the cleaner on the back of the intake valves!
Might want to watch this video:


Not endorsing it's use and wonder how it interacts with the CATs. It also must be injected "after the MAF."

The video shows removing the air cleaner to get the tube past. The supplied thin tube attached to the product may just make it past the MAF on a C7. It is located in the intake air tube about 6 to 7 inches past the base of the air cleaner (which would have to be removed.) Then you run the engine at 3500 rpm while you empty the can contents. Not sure how long that lasts.

 

To avoid worrying about the build up I just dump my oil that's caught in my catch can directly into my air intake.

 

Correct. This product appears to be for conventional fuel injected engines.
On DI engines you would need to fog the solvent through the PCV system to get to the back of the valves. That is the method some dealers use, short of mechanical cleaning.

 

^^^
If you watched the video it is injected into the intake after the MAF and before the throttle body and would go right to the back of the valves. Yep, you could inject into the PCV opening in the intake manifold and it would go to the same place. For a professional system that may be preferred but this is for a "home user."

It says it is for both DI and Port injection but the video states it is designed for DI where the lack of gasoline passing over the intake valves creates a bigger problem.

Again, I am not endorsing the product, just relaying what it shows in the video.

 

I've read all the posts about this myth of coking.... I had my 2017 Corvette Z51 with approx. 26000 miles on it that just spent 7 weeks (during the UAW strike) in the dealership getting the number 1 piston replaced due to a fiction piece of carbon buildup that came off the valve and destroyed it.The tech that worked on my car has been with chevy for right at 30 years. Once the carbon ate the piston it showed up as the #1 cylinder misfiring. He also performed a cleaning of the all the valves to prevent this from reoccurring. I had him show me where to connect the cleaner to and he said it should be done about every 20k miles. So, needless to say I will be doing this every 10k miles unless I am told other wise that it is detrimental to the engine to perform this cleaning too often to the engine. Thus in my opinion is this is a problem and if it is so easy to fix with a simple cleaning why not just perform it...seems like it takes only a few minutes.

 

Can someone correct me if I am wrong please? To get a significant amount of coking wouldn’t you be topping off oil all the time? I mean oil would have to be leaving the engine to coke the valves right?

 

Very interesting! As you note many have said there is no problem with the LT1 DI. That despite other high performance DI's have had issues, i.e. BMW and Ferrari. Some of us added catch cans to condense and collect some of the oil vaper and toss it out before it causes "coking" on he backs of the intake valves. I was collecting about 1 oz/1000 miles like many. I purposely only installed a one inlet one outlet "Can" that just went from the crackcase to the intake manifold by replacing the OEM PCV hose. There were only a few reposts of excess "coking" with some folks having 100,000 miles. Tadge just said what was there is "mostly" cosmetic.

I removed "the Can" when I sold my 2014 to put in on my 2017 Grand Sport. GM spent a lot of effort to "fix" what some say was a non-problem! They had lines going to the valve covers and elsewhere (see pic.) Before I installed that "Can" I did some cheeks of pressure as now it only had one line going into the intake air pipe NOT the one that brought in clean filter air. But after the tests decided I was doing no harm so installed the "Can." I got about half the captured oil I had on my 2014 Z51. Then saw a post that said "a small amount of oil" coming from the crackcase does help lub the intake valve steams. Decided because I was capturing much less AND I'll sell the Grand Sport when my C8 arrives I'd remove it!

Assume your 2017 Z51 Dry Sump has the same "improved PCV system" as my Grand Sport. In any case, not concerned because I'll be selling the Grand Sport and driving a C8 before any problems might occur! Assume they have reduced the C8 LT2 excess oil going into the intake from the crackcase even more- we'll see!

Below is a pic showing the vacuum/pressure gauge used to see if the now one line now going to the air intake tube from delivers "burped" air. It does. The other identifies the many new lines added to the 2017 Grand Sport versus my 2014 Z51 dry sump. Still not sure how filtered fresh air get's into the crackcase to replace that being sucked out by the oil/air scavenge pump. That line that was on the 02014 Z51 does not exist. Had to put in a threaded plug when I installed the 2014 "Can" on my Grand Sport. For those that said there was no problem with the 2014/2015 dry sump PVC system relative to "coking" GM sure went though a lot of engineering effort to improve the "no problem!" Perhaps like Tadge said what occurs is "mostly" cosmetic but would not be so sure there is no power reduction over time.

 

Nope. This is a pic from before DI when gasoline companies were showing what happened even with gasoline washing the backs of the intake valves IF it did not have enough "cleaners." Doesn't take much oil to form a "caked" deposit. There was an article where even some GM engineers mentioned a piece of carbon could wedge between the intake valve and seat and cause it to burn. However few reports of issues with the LT1.

 

No, it wouldn't take significant quantities of oil to the point that you are topping off the oil all of the time. Almost all engines have small quantities of oil mist/vapor that are recirculated into the intake system. Many have installed catch cans and very few have reported any actual issues from valve coking on the Corvette. It's your call if you want a catch can, but I wouldn't stress too much over it.

 

I bought my Z51 with 11000 miles. I currently have 13500. I installed a catch can shortly after purchase. It amazes me how much I get out of it with it just hooked up to the PCV valve side. I'd say it has stopped 2-3 fluid ounces of oil in 2500 miles. I'm definitely glad that is not going into the engine and coking the valves. Also I have noticed the chrome tailpipes stay cleaner. It works. I noticed the intake was contaminated with oil when I removed the throttle body and ahead of the throttle body was dry so it must be all from the PCV tube on drivers side.

 

I had a Catch Can on my 2015 Z51, but I traded it in with about 4500 miles -took the catch can off and sold it.
I traded the 2015 on a 2019 Z06 and didn't put on a catch can, it sounded like there were some changes made from the factory and it looks quite a bit more involved to install a catch can.
One thing that I found interesting is that when I was getting oil for the Z06, Mobil 1 literature highlights that they worked with GM to develop a blend especially for the LT1/ LT4. One highlighted attribute of the ESP Formula 0W-40, is that this oil is, " specifically designed to help reduce oil aeration during aggressive driving -this should help too -right?.

 

Carbon wrecked a piston huh.
Id like to know how the tech arrived at that conclusion.
Im calling bullshat ...

 

This is a "doesn't apply to the way most Vette owners drive" concern.

Fact 1; For 2800-3000??? C7 owners, the last, best, motor invented especially for the Corvette C7, the LT5 engine for the ZR1, has BOTH Direct injection AND PORT INJECTION. ZR1 owners will never have carbon buildup on their valves, the port injection swirls nice, detergent carbon-dissolving chemicals in top tier gasoline around the backs of valves keeping them eternally shiny.

Funny GM doing this on the last motor they developed for the C7 vette after making defending 'it don't need it!" statements since 2013.

And, in a way GM's statement rings true. The 60,000 vette miles driven necessary for there even being the possibility of caked carbon buildup on the valves to the point of reduced engine performance from the valves not seating correctly from carbon buildup is almost unicorn small. i mean, most vettes are put to bed with a hotwater bottle, and an electric blanket when the temperature drops below 59 degrees F. how many: 'well i put my baby to bed until spring" threads are on the forum right now? And heaven forbid it is driven in the rain!

Again, a 60k mile and above vette sighting is a unicorn.

And if somebody does go where no vette has gone before, GM got a fix for that one too:

FACT 2. "GM announced it is reducing the length of Chevrolet and GMC powertrain warranties to five years or 60,000 miles beginning in the 2016 model year — a 40,000-mile drop."

So GM don't gotta fix what "can't happen" in a vette, but "might" starting at 60,000 miles. Whew! they squeaked by without a peep from anybody on that warranty fix avoidance.

And last fact. oil aeration and those nasty carbon buildup vapors is (oops! was) a real concern to GM, at least back in ought 13, until GM stopped making the vapor collection kit (never available for the Vette), and then told GM mouthpieces to stop talking about oil vapor crud buildup, at least until they put a vapor cleaner (port injection) back in the LT5 in 2019:

FACT 3: I think the Z06 racetrack failure plaintiff lawyers should pickup on these factoids, only the ZR1 vette runs free of carbon vapor-crud buildup on the track! At least in addition to a coupon good for $1000 towards purchase of a new C8 for lawsuit settlement terms, Z06 owners might also get a catch can kit from GM. They know how to build one.

 

Guess I'm living on borrowed time - my '15 has almost 93,000 and within the next 10 days will be closer to 95,000...... tires, need new tires....

 

Regarding the LT5 “Usually the engine will operate solely on direct injection, while the port injectors supplement the direct-injection system under heavier fuel loads -- like when the engine is at wide-open throttle.“ Source Dual injection wasn’t implemented solely to reduce carbon buildup for the LT5. 5yr/60k drivetrain warranties are pretty much industry standard, I doubt Chevrolet implemented this just to avoid issues with carbon deposits... I’m not agreeing or disagreeing with you, carbon buildup certainly happens to some degree at some point in most engines... I’m just not so sure there is some huge conspiracy theory around it with the LT1.

 

Although I’m going to discuss one of my previous cars that was a Ford product, a Focus ST, it too was a DI motor. When I pulled the intake manifold off at 4500 miles to install a catch can, I could see the damage, if you want to call it that, was already done. The valves were coked and looked like they had a few 100,000 miles on them. After seeing them, I could not understand how they were even still operating with any amount of efficiency.

 

Was that a DOHC engine ?

 

Yes.