When I first bought this car I originally bought a catch can. Every car I’ve ever owned has always needed one. Especially for heavy use. When I went to the PTR intake I didn’t have the hoses and fittings I needed right off the bat so I lazily went with it. Pride is hurt a little today. I always do full inspections after every track weekend and I was getting a very little pool of oil in the coupling leading to the throttle body. I’d clean it and move on. It didn’t seem to worrisome.

The last few weeks I’ve been going through this car like a fine tooth comb getting it ready to go to the shop for my heads and cam. Maybe more. Cleaning the whole engine bay, suspension, and so on. It’s usually clean anyways but I want it spotless for my shop. Just who I am. Being mostly track car I’m diving in more and deleting simplifying several items along with deleting the EVAP system (hold your opinions to yourself on that ). So needing to remove the PTR intake I get this slight hint of sloshing sound as I pull it off. Video below shows the rest. I was planning on putting a catch can back on this winter. So I fired myself today but had to rehire to get it done. 😀

This car along with all others show that no engine is that great from any manufacturer when it comes to several factors. And they’re not meant to be honestly. In the long run all cars are seen as just street cars from the manufacturer. Period. Even then some things are questionable. Take this for whatever you feel. My shop plus LME have both identified from multiple built motors from the LT2 dry sump system have some minor flaws within the new design. Especially the crank case pressure. More so under hard driving (tracking), especially under deceleration as I was told and all FI setups. LME had already made few changes to their products as briefly explained on their site. I’m just catching up. Everything has its learning curves and at least they’re being discovered and altered. Just putting up some of my experience. I'm sure there may be some slight other underlying issue and this was over a period of time but doesn't change the fact to much.

“But it’s designed perfectly from GM”. I’ve had so many laughs to that statement. But I knew better.

 

Wow, i did notice oil in my intake manifold when swapping it out for the modified one. So, I installed a can.

 

Well that makes me rethink not installing a catch can. How many miles/hours do you estimate are associated with getting that much oil?

 

The catch can was one of the first things I installed on my car. They are beneficial on direct-injected engines. They prevent oil and other contaminants from causing buildup inside your engine's intake manifold. Depending on how aggressive you drive (RPM's) will dictate the frequency on checking and emptying the catch can.

 

I've been thinking about this too. Does anyone sell a kit to install it on a C8?

 

Paragon Performance has them for both HTC and Coupe

https://www.paragonperf.com/paragon-...vertible-.html

 

Thanks. Ordering today.

 

110,000% need a catch can. (From experience).

LME is on the right track with their vented short blocks.

 

Im going to say about 4 track weekends about 18 hours and roughly 300 street miles. You can easily get away without one for normal use but why not. Pretty inexpensive and peace of mind. Like to remind you, LME engine builder a reputable well know company has said they found a few things that could have done better with these motors and have made a few changes on their builds. There is more than desired crank case pressure in these cars. I just blew a rear main seal from this. Keep in mind my car is driven harder. Just sharing possibilities.

 

Mishimoto C8 catch can on sale for a tad over $200. Decent price for what looks like a quality product.

https://www.mishimoto.com/chevrolet-...IaArm_EALw_wcB

 

Wish they would do what Ford does with the Gen3 and newer Coyote motor... They use a dual injector setup... One set is DI, and then a second set up in the intake tract, that washes over the valves and keeps them clean... I think Toyota does it too...

 

C7 ZR1 too, but it was to supply the fueling needs. LT1/2 engines don't need it and aren't experiencing any coking issues. I had my C7 intake manifold off numerous times and even after 7 years/60k miles the intake valves were fine.

Back on the subject of catch cans, I've tested a few and found the quality of Corsa's and Mishimoto's to be good (the edge goes to Mishi for their molded hoses), while I was less than impressed with Paragon's, unfortunately. The amount of true R&D that Mishimoto does is impressive as they've quietly become a leader in the catch-can and intake tract arena.

 

Back in my Z car days we used air water separator for an air compressor. Which worked great on those motors. 🤙🏻

 

I installed a catch can with less than 10 miles on the odometer. Its good insurance and the video op posted reaffirms that

 

This is after about 1k miles, I swear by a catch can. Rather be dumping out the oil vs it going thru my intake and coating my valves.

 

I agree, I also empty my catch-can usually after putting about 1,500 miles on the car. I have read other threads about people thinking its not needed or why didn't it come with it if needed. Clearly guys who install catch-cans are showing genuine proof of the oil that is produced through PCV system. I know some people may think it's not a big deal. It's their car, so it's their decision.

Below is a parcel copy and paste from a story about how much excessive carbon the LT2 developes. Story is from Joe Kucinski on this forum and was back on Sept 27, 2023.
It was titled "5 Amazing/Terrible things about GM's LT Family of V8 Engines"

Carbon Build Up

Another technology found in the LT engine family is direct injection. The downside to it is that it can lead to excessive carbon build up on the valves. This can lead to loss of power, a rough idle and other things that you would rather not have with your engine. General Motors is aware of the issue and in May of 2020 issued service bulletin 16-NA-383 to help technicians identify the problem.

 

thanks for sharing. I know a popular argument as you also mention is the engineers would have put one on if it needed it.

As we see on this forum and elsewhere, some people can't even change their oil once a year so how would they empty their catch can out more frequently and the disposal of that oil is a concern since a lot or people do not do their own oil changes or have the means to empty it. The cars will be out of warranty by the time any problems may arise from carbon build up so its not as big a concern by the manufacturer I believe.

Some of us feel better having them on and it's a cheap and easy mod if you feel the need to add it.

 

…man y’all are killing me! Bunch of Black Friday sales going on right now, but I’m on the fence… My DI V6 in my daily driver developed a misfire due to carbon build up, but not until 150K miles, and it’s not a dry sump system like the C8. In my research, some claim that the catch can is just catching the oil that the dry sump system would’ve caught anyway in the C8… I don’t mind spending the money if it will help, but I’m not prone to spend money on things that just aren’t a definite benefit… Like I said, still on the fence…

 

Buddy was installing a catch can on his new 6.2L GMC and it made me ask...."why do I not have one of these on my C8?"

I assume, from this thead, that they are still recommended and that Mishimoto's seems to be the best of the bunch?

 

I like Mishimoto because they supply pre-formed hoses and their bracket to hold the can in place is made to mount to existing threaded holes in the engine bay. It looks almost factory.