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  1. #1
    Philosophizer ssg10587's Avatar
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    Oil Catch Cans worth it?

    Thoughts? They useful or snake oil? Ghetto rigged one for my LS2 for $40. Been researching them and can't tell if they are useless junk or if they are effective at limiting carbon deposits for DI engines.

    LS engines apparently have more of an issue so figured I'd give it a try.
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  2. #2
    Registered User Jyates383's Avatar
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    Originally Posted by ssg10587 View Post
    Thoughts? They useful or snake oil? Ghetto rigged one for my LS2 for $40. Been researching them and can't tell if they are useless junk or if they are effective at limiting carbon deposits for DI engines.

    LS engines apparently have more of an issue so figured I'd give it a try.
    They are pretty common in the LS world, especially with motors that have some miles on them. With that being said, my old 99 LS1 doesn't lose any oil at all between changes so I've never really considered one. They are definitely useful on boosted cars as well. At the very least its not going to hurt anything. Put some miles on your car and check the can and see what ya get.
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    Misc Zymurgist J1n's Avatar
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    Depends on the car. take a look inside the can after a while and see if it did anything.
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  4. #4
    Philosophizer ssg10587's Avatar
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    Originally Posted by Jyates383 View Post
    They are pretty common in the LS world, especially with motors that have some miles on them. With that being said, my old 99 LS1 doesn't lose any oil at all between changes so I've never really considered one. They are definitely useful on boosted cars as well. At the very least its not going to hurt anything. Put some miles on your car and check the can and see what ya get.
    Yeah this is what I've mainly seen as well. For NA cars they arn't too important.

    Originally Posted by J1n View Post
    Depends on the car. take a look inside the can after a while and see if it did anything.
    yeah will try. I do push my vette somewhat often. For $40 it isn't too much of a gamble.
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  5. #5
    Tuna, No Crust Jax05's Avatar
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    I'd say they're very useful, especially on boosted cars. They reduce the amount of crap that would end up in the intake manifold. Just don't forget to check/empty often.

    I have a 3oz catch can in my mustang and it will get about half full after a day at the track.
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    Originally Posted by ssg10587 View Post
    Yeah this is what I've mainly seen as well. For NA cars they arn't too important.



    yeah will try. I do push my vette somewhat often. For $40 it isn't too much of a gamble.
    They are important on any vehicle that vents the crank case to the intake. The newer LT1 supposedly have a catch can type system that it is supposed to be a huge improvement but I haven't kept up with them since I got rid of my '13 SS 1LE. I installed a catch can on mine within a couple hundred miles of getting it and would regularly captured 3-4 tablespoons of oil between 5k mile oil changes. Even that amount would eventually gunk up the intake...even if it was 50k-60k miles later.

    I also had one on my '08 GT500 it made even more of a positive difference. I put one on it right when I got it and thankfully the previous owner only put just under 7k miles on it so it was still relatively fresh. I eventually put on a VMP elbow with new tbody but I had to blend the elbow to the SC housing so I got a good look at the inside and it wasn't nearly as covered in oil as I've seen in other GT500s that never had a catch can.
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  7. #7
    Philosophizer ssg10587's Avatar
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    Originally Posted by Jax05 View Post
    I'd say they're very useful, especially on boosted cars. They reduce the amount of crap that would end up in the intake manifold. Just don't forget to check/empty often.

    I have a 3oz catch can in my mustang and it will get about half full after a day at the track.
    Originally Posted by fmylife4real View Post
    They are important on any vehicle that vents the crank case to the intake. The newer LT1 supposedly have a catch can type system that it is supposed to be a huge improvement but I haven't kept up with them since I got rid of my '13 SS 1LE. I installed a catch can on mine within a couple hundred miles of getting it and would regularly captured 3-4 tablespoons of oil between 5k mile oil changes. Even that amount would eventually gunk up the intake...even if it was 50k-60k miles later.

    I also had one on my '08 GT500 it made even more of a positive difference. I put one on it right when I got it and thankfully the previous owner only put just under 7k miles on it so it was still relatively fresh. I eventually put on a VMP elbow with new tbody but I had to blend the elbow to the SC housing so I got a good look at the inside and it wasn't nearly as covered in oil as I've seen in other GT500s that never had a catch can.
    Thanks! Nice to know your experience with LSes and coyotes. Sounds like it will be worth it.
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  8. #8
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    I would only install one on a boosted engine. I have one on my 03 Cobra and it helps.
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  10. #10
    Registered User shmobin's Avatar
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    They are a essential if you're sitting behind a HEMI.
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    100% beneficial, especially with today's DI engines.

    Unfortunately, most if not all cars with DI, like my C7Z, if you install a catch can, which is beneficial, voids your warranty.

    So that's why i haven't did it. Otherwise i would have the first week of ownership.

    Since i can't, only thing i can do is just use the car until warranty is up, maybe slightly sooner, then trade the car for something newer lol. Hopefully the new C8Z if that's available at that time.
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    Manlet with Credentials Jasonw1178's Avatar
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    DI motors get carbon deposits because they don't have the fuel to keep the valves clean. I don't see a catch can helping. It might keep the engine from burning as much oil which could help preserve your catalytic converters and A/F sensors. A lot of oil could back into the throttle body and short it. Typically oil going back up through the PCV system is due to piston ring blow-by.
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    Philosophizer ssg10587's Avatar
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    Originally Posted by ScottsdaleDream View Post
    For the price, you really can't go wrong.
    Originally Posted by IAMBEE View Post
    I would only install one on a boosted engine. I have one on my 03 Cobra and it helps.
    Originally Posted by shmobin View Post
    They are a essential if you're sitting behind a HEMI.
    Thanks good to know and figured as much. Just seems like a lot of back and forth over them.

    Originally Posted by 1QWIK7 View Post
    100% beneficial, especially with today's DI engines.

    Unfortunately, most if not all cars with DI, like my C7Z, if you install a catch can, which is beneficial, voids your warranty.

    So that's why i haven't did it. Otherwise i would have the first week of ownership.

    Since i can't, only thing i can do is just use the car until warranty is up, maybe slightly sooner, then trade the car for something newer lol. Hopefully the new C8Z if that's available at that time.
    Yeah know they screw w your emissions testing i think.

    Originally Posted by Jasonw1178 View Post
    DI motors get carbon deposits because they don't have the fuel to keep the valves clean. I don't see a catch can helping. It might keep the engine from burning as much oil which could help preserve your catalytic converters and A/F sensors. A lot of oil could back into the throttle body and short it. Typically oil going back up through the PCV system is due to piston ring blow-by.
    That I'm aware of a catch can is for catching engine oil vapors burned off through use normally at higher rpms rather than those vapors possibly going into the intake and depositing on the intake valves and sitting in the intake. It is placed in line from the PCV to the cooler I think or to the intake manifold in NA cars.

    Is that correct? No car whiz but what I've gathered from my research.
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  14. #14
    RN and vette crew 1QWIK7's Avatar
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    Originally Posted by Jasonw1178 View Post
    DI motors get carbon deposits because they don't have the fuel to keep the valves clean. I don't see a catch can helping. It might keep the engine from burning as much oil which could help preserve your catalytic converters and A/F sensors. A lot of oil could back into the throttle body and short it. Typically oil going back up through the PCV system is due to piston ring blow-by.
    The whole point in having a catch can is to prevent a flow of vaporized oil from passing over the intake valve stems where it can possibly leave behind a coke deposit over time as well as contribute to carbon build up on pistons when combustion occurs. Valve stem coking can over time mechanically interfere with normal valve operation and carbon deposits on pistons can lead to hot spots, preignition, and timing pulled, hence less power.

    Because there's no more fuel being splashed on top of the intake valve to clean it, a catch can is almost a must in DI engines. Or just having a walnut blast every 20-30k to clean everything up.

    Some engines we have opened up we have seen bad coking as early as 10k miles. This is on most modern DI engines, not so much with my car in general.
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    They're a requirement on direct injected engines. Most engines have them from the factory now but they don't always do that good of a job. Direct injected engines don't have fuel spraying onto the intake valve to clean them so the crap from the pvc system (crank case ventilation system) starts to accumulate and build carbon deposits.

    On my Cadillac I had to remove the intake manifold and clean the valves off they got so dirty.

    I didn't have a air compressor to run a walnut blaster so I had to manually spin the crank closing the valve and using a chemical addictive with a brush to break it up. It's extremely time consuming and something you never want to do.

    The above posters saying they screw with the emissions have no idea what they're talking about. If you're not running a breather on the catch can nothing is being ventilated outside of the car.
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    They are a good purchase for sure, probably more beneficial for some engines more than others. They certainly don't hurt.
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    They are beneficial if they actually have media inside to condense the oil vapor. Alot of the cheap ones are just a can with nothing inside them. They will catch some but not really enough to help.
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    Originally Posted by nickyoobatz View Post
    They are a good purchase for sure, probably more beneficial for some engines more than others. They certainly don't hurt.
    They are beneficial. Unfortunately it voids a warranty almost immediately if installed on most cars.
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    I've had one on my LS7. I change the oil around 5-7.5k miles and it's usually got a nice deposit inside of it.
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    Originally Posted by 1QWIK7 View Post
    They are beneficial. Unfortunately it voids a warranty almost immediately if installed on most cars.

    Just take it off before going to the dealership? It's two hoses that connect to existing fittings. There's no way they'd be able to tell you had one.
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  21. #21
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    Originally Posted by 1QWIK7 View Post
    They are beneficial. Unfortunately it voids a warranty almost immediately if installed on most cars.
    I could be wrong, but I thought if something happens to the car that requires warranty work, the dealer would have to prove a catch can (or any part for that matter) was the failing point.
    I've never heard of any issues with catch cans and warranty otherwise.
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