Let me preface this by saying I do not know very much about the issue of blow by with direct injection motors. I joined an Accord forum to follow for TSBs/other issues that might pop up on my new car and the biggest discussion is always around air/oil separators and catch cans. Some people report they are catching 3 ounces of oil/gas/water mixture every few weeks, some every couple of months, some say the entire catch can is unnecessary.
What are everyone's thoughts? Mishimoto makes a kit that is $200 so not a huge investment cost if this will help prevent buildup for years to come. On the other hand, if the intake manifold needs to be cleaned every 50k or so miles that might be two times during my ownership at most so having to empty a catch can every so often may be a waste of time.
2019 Accord Sport 2.0 A/T
2012 Civic Si - Sold
I caught an ASSLOAD in the catch can in my old Canyon. The 3.6DIs have been known as dirty motors for a long time. I want to say by the time I sold it at 20kish miles I had completely filled a big pasta jar full of oil plus another quarter jar. There is no doubt that would have ended up baking onto my manifold and valves.
It's like one of the most polarizing subjects in car modding. I worried more about bent valves and poor mileage / performance so I went ahead and did it. Definitely do some research on the best options for you, there seems to be better designed variants. I bought the Elite Engineering E2 (I think) standard catch can and it was excellent. It looks like they have more options now including breathers: http://www.eliteengineeringusa.com/catch-cans/
I chose not to get one for the Mazderp because apparently the new Skyactivs have figured out the blowby issue. But any other modern DI motor I think it's a good investment if you plan to drive the car for a while.
Posting in the banalist of threads since 2004
2017 Mazda CX-5 GT AWD Premium
Past: 2016 GMC Canyon All Terrain Crew Cab / 2010 Jaguar XFR / 2012 Acura RDX AWD Tech / 2008 Cadillac CTS / 2007 Acura TL-S / 1966 5.0 HO Mustang Coupe
2001 Lexus IS300 / 2004 2.8L big turbo WRX STI / 2004 Subaru WRX / A couple of old trucks
(03-11-2019, 09:46 AM)JPolen01 Wrote: What are everyone's thoughts? Mishimoto makes a kit that is $200 so not a huge investment cost if this will help prevent buildup for years to come. On the other hand, if the intake manifold needs to be cleaned every 50k or so miles that might be two times during my ownership at most so having to empty a catch can every so often may be a waste of time.
I think you nailed it, there.
Is it worth dicking around with what is effectively emissions control equipment on a brand new car, vs paying $500-600 to blast the valves & intake manifold clean every 50-60k? Maybe/maybe not. On my old Audi I had an aftermarket PCV system & catch can, made sure to run it hard often enough and had no carbon buildup issues. But I bought that car with 95k on it so different story.
(09-25-2019, 03:18 PM)V1GiLaNtE Wrote: I think you need to see a mental health professional.
03-11-2019, 09:54 AM
(This post was last modified: 03-11-2019, 09:57 AM by Sijray21.)
I'm of the opinion that they are effective at removing water/oil, but a relative pain in terms of maintenance (mostly when it gets subfreezing where the water caught could freeze and cause a vacuum problem that has the potential to blow seals/gaskets).
I've heard that the moisture caught would normally evaporate during hot engine temps, but I think I'd still run one that has an easy to remove can. I won't be putting one the gti I have currently due to the fact that a cleaning is about the same cost as a catch can, but if I were to get another DI-engine car I'd likely install one.
Cars with better pcv systems seem to have less of an issue, so I'm kind of monitoring which cars are having less carbon build up issues and leaning towards those as viable options in the future.
(03-11-2019, 09:54 AM)Sijray21 Wrote: Cars with better pcv systems seem to have less of an issue, so I'm kind of monitoring which cars are having less carbon build up issues and leaning towards those as viable options in the future.
That's the problem I have right now with a new gen car with a new motor. But I guess I can wait a year or two and see what research comes out. By then there won't be too much build up and I could add one if needed. I really don't feel like dicking around with emptying the can. But if it will really prolong the life of the engine I can deal with the inconvenience.
2019 Accord Sport 2.0 A/T
2012 Civic Si - Sold
(03-11-2019, 10:01 AM)JPolen01 Wrote: (03-11-2019, 09:54 AM)Sijray21 Wrote: Cars with better pcv systems seem to have less of an issue, so I'm kind of monitoring which cars are having less carbon build up issues and leaning towards those as viable options in the future.
That's the problem I have right now with a new gen car with a new motor. But I guess I can wait a year or two and see what research comes out. By then there won't be too much build up and I could add one if needed. I really don't feel like dicking around with emptying the can. But if it will really prolong the life of the engine I can deal with the inconvenience.
It's really no big deal. I would just pop the hood every few weeks and empty it into a jar. It takes all of 5 minutes
Posting in the banalist of threads since 2004
2017 Mazda CX-5 GT AWD Premium
Past: 2016 GMC Canyon All Terrain Crew Cab / 2010 Jaguar XFR / 2012 Acura RDX AWD Tech / 2008 Cadillac CTS / 2007 Acura TL-S / 1966 5.0 HO Mustang Coupe
2001 Lexus IS300 / 2004 2.8L big turbo WRX STI / 2004 Subaru WRX / A couple of old trucks
yeah, that's the.... catch... the newer cars won't show any issues until they're higher mileage, but by then it's cheaper to get an intake port cleaning. I don't think it could hurt installing one at all, just make sure you drain it frequently in the winter months where it drops below freezing.
03-11-2019, 10:58 AM
(This post was last modified: 03-11-2019, 10:59 AM by D_Eclipse9916.)
Funny you mention this, I have noticed an odd rough idle every now and then on the Land Rover. Just enough to feel it at odd tempo to regular idle. Not enough to notice by my wife but I have noticed it. Tried new filters/cleaned the MAF/ran the car hard and it's still there. I suspect plugs at the next 30k, but really thinking about walnut blasting. Anyone had this service done?
2020 Ford Raptor
2009 Z06
1986.5 Porsche 928S
Same as said above. I've done the math and the price of cleaning is less than a good catch can. The cheap systems for GTIs operate differently than the expensive ones so I would be a waste and the Mk7 is a lot better about coking, apparently.
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(03-11-2019, 10:58 AM)D_Eclipse9916 Wrote: Anyone had this service done?
i'm not sure what the VW dealership did to clean the ports/valves, but i've had it done once and i cleaned them myself once. It's not a fun job at all, just very dirty.
(03-11-2019, 10:58 AM)D_Eclipse9916 Wrote: Funny you mention this, I have noticed an odd rough idle every now and then on the Land Rover. Just enough to feel it at odd tempo to regular idle. Not enough to notice by my wife but I have noticed it. Tried new filters/cleaned the MAF/ran the car hard and it's still there. I suspect plugs at the next 30k, but really thinking about walnut blasting. Anyone had this service done?
I want to say Stephen had this done. Maybe his GTI or E46? I can't recall.
2019 Accord Sport 2.0 A/T
2012 Civic Si - Sold
The dealer did it to my Dads GLI. Jon, at least at my dealership we haven't had any issue in for what you're worried about and i've seen mileage as high as 70k so far.
2013 Honda Fit, 1991 Mazda Miata, Princess Blanca, Mystery, 1993 Volvo 940 - sold, 2003 Mazda Protoge5 - carmax'd, 1996 BMW 328is - sold, 1996 Honda Accord - sold
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