00:00:00.000 hello everyone and welcome in this video 00:00:02.24000:00:02.250 we're gonna be talking about why oil 00:00:03.74000:00:03.750 catch cans are a great idea especially 00:00:06.28900:00:06.299 for direct injection engines now this 00:00:09.44000:00:09.450 video is brought to you by RetailMeNot I 00:00:11.78000:00:11.790 will talk about that more at the end of 00:00:13.28000:00:13.290 the video but know that there is a 00:00:14.69000:00:14.700 relevant link in the video description 00:00:16.07000:00:16.080 and in this video we're gonna be 00:00:17.87000:00:17.880 focusing on four main topics so the 00:00:20.54000:00:20.550 first one being a quick overview of how 00:00:22.42900:00:22.439 these systems work how oil catch cans 00:00:24.59000:00:24.600 work the second one will be looking at 00:00:26.48000:00:26.490 some scientific research to see what 00:00:28.07000:00:28.080 data-driven answers we can get behind 00:00:29.81000:00:29.820 whether or not these devices are 00:00:31.82000:00:31.830 effective the third thing we'll be 00:00:33.79900:00:33.809 looking at a real-world example so 00:00:35.87000:00:35.880 looking at an oil catch cans use on a 00:00:38.17000:00:38.180 Volkswagen and then finally we'll end 00:00:40.54900:00:40.559 with looking at different priced options 00:00:42.65000:00:42.660 so I have a twenty five dollar oil catch 00:00:44.36000:00:44.370 gain right here $100 oil catch can right 00:00:47.06000:00:47.070 here and then this one is two hundred 00:00:48.86000:00:48.870 thirty dollars so we're going to look at 00:00:50.24000:00:50.250 different priced options and see if it's 00:00:52.06900:00:52.079 actually logical to spend more money or 00:00:53.84000:00:53.850 whether or not you know you can get away 00:00:55.25000:00:55.260 with something that costs a bit less so 00:00:57.31900:00:57.329 looking at my s2000 engine here it makes 00:00:59.63000:00:59.640 it really easy to understand how these 00:01:01.58000:01:01.590 oil catch cans work and so here we have 00:01:04.39900:01:04.409 the valve cover on top of my engine and 00:01:06.14000:01:06.150 you can see this hose leading from the 00:01:08.06000:01:08.070 valve cover over to the intake manifold 00:01:10.34000:01:10.350 now this is the positive crankcase 00:01:11.99000:01:12.000 ventilation system and so what it does 00:01:14.14900:01:14.159 when you have combustion strokes you're 00:01:16.58000:01:16.590 gonna have that high pressure on top of 00:01:17.84000:01:17.850 the piston and some of that high 00:01:19.19000:01:19.200 pressure called blow-by can come past 00:01:21.64900:01:21.659 that piston and it'll pressurize your 00:01:23.60000:01:23.610 crankcase the area underneath the piston 00:01:25.96900:01:25.979 and so you need that pressure to be able 00:01:28.03900:01:28.049 to escape and that's why they have these 00:01:29.78000:01:29.790 positive crankcase ventilation systems 00:01:31.70000:01:31.710 so it allows that high pressure to 00:01:33.71000:01:33.720 travel from your crankcase over to your 00:01:35.78000:01:35.790 intake manifold now in doing so any oil 00:01:38.81000:01:38.820 mist that's turning around within your 00:01:41.17900:01:41.189 engine as well as contaminants that have 00:01:43.28000:01:43.290 passed by your Pistons from blow-by can 00:01:45.92000:01:45.930 then enter back into your intake 00:01:47.89900:01:47.909 manifold through this positive crankcase 00:01:50.03000:01:50.040 ventilation system and that means those 00:01:52.06900:01:52.079 contaminants can then hit your intake 00:01:54.02000:01:54.030 valves the oil can hit those intake 00:01:55.91000:01:55.920 valves and you can start having deposits 00:01:57.83000:01:57.840 build up on your intake valves so the 00:01:59.87000:01:59.880 idea behind an oil catch can is that you 00:02:02.27000:02:02.280 reroute this hose so you take one end of 00:02:04.60900:02:04.619 the hose and you send it to the inlet of 00:02:06.41000:02:06.420 this oil catch-can and then within the 00:02:08.90000:02:08.910 oil catch hand you're going to have a 00:02:10.99900:02:11.009 filter as well as this baffle here in 00:02:13.49000:02:13.500 school 00:02:13.85000:02:13.860 going to separate out that oil from the 00:02:17.30000:02:17.310 air and so you'll have the oil trapped 00:02:19.31000:02:19.320 at the bottom of this catch-can and 00:02:20.81000:02:20.820 you'll allow that air to travel then 00:02:23.03000:02:23.040 you'll have a hose routed out back to 00:02:25.34000:02:25.350 the intake manifold so you don't allow 00:02:27.05000:02:27.060 those contaminants from reaching your 00:02:28.91000:02:28.920 intake valves and thus you help prevent 00:02:30.89000:02:30.900 deposits from forming on the intake 00:02:32.75000:02:32.760 valves now with port fuel injection like 00:02:35.12000:02:35.130 on my ass mm this isn't that big of a 00:02:37.22000:02:37.230 deal because the port injectors actually 00:02:39.47000:02:39.480 spray fuel which goes over these intake 00:02:41.66000:02:41.670 valves and helps to keep them clean with 00:02:43.76000:02:43.770 direct injection engines you don't have 00:02:45.71000:02:45.720 that fuel cleaning the valves and thus 00:02:47.42000:02:47.430 they're more likely to have deposits 00:02:49.04000:02:49.050 form moving on what does science tell us 00:02:51.53000:02:51.540 about positive crankcase ventilation 00:02:53.06000:02:53.070 systems and how they affect intake valve 00:02:55.69900:02:55.709 deposits with direct injection engines 00:02:58.10000:02:58.110 so I found a very cool study published 00:03:00.26000:03:00.270 in Society of Automotive Engineers and 00:03:02.60000:03:02.610 they were looking at a 2008 Pontiac 00:03:05.39000:03:05.400 Solstice with eight hundred thousand 00:03:08.47900:03:08.489 kilometers on the clock so very 00:03:10.40000:03:10.410 impressive that a solstice made it that 00:03:12.11000:03:12.120 far the reason they chose to use one 00:03:13.55000:03:13.560 with such high mileage is that it 00:03:15.14000:03:15.150 accelerates the deposit forming process 00:03:17.42000:03:17.430 and so as a result they're able to run 00:03:19.61000:03:19.620 these tests more quickly and see what 00:03:22.52000:03:22.530 would happen what scenarios caused 00:03:24.44000:03:24.450 deposits what scenarios do not so the 00:03:26.72000:03:26.730 Pontiac Solstice used for this 00:03:28.03900:03:28.049 experiment has a 2-liter turbocharged 00:03:30.17000:03:30.180 gasoline direct injection engine it 00:03:32.69000:03:32.700 produces about 255 horsepower and it's 00:03:35.27000:03:35.280 doing so with about 20 pounds of boost 00:03:37.67000:03:37.680 so the experiment the study performed 00:03:39.97900:03:39.989 was to take the Solstice engine and to 00:03:41.84000:03:41.850 put it on a repetitive Drive cycle that 00:03:43.91000:03:43.920 would last for 16,000 kilometers now at 00:03:46.72900:03:46.739 the end of those 16,000 kilometers they 00:03:48.86000:03:48.870 would replace the spark plug the fuel 00:03:51.02000:03:51.030 injectors and the intake valves for the 00:03:53.18000:03:53.190 next test and they would weigh the 00:03:55.69900:03:55.709 weight of the intake valve before and 00:03:57.89000:03:57.900 after those 16 thousand kilometers to 00:04:00.19900:04:00.209 see how much valve deposits were formed 00:04:02.57000:04:02.580 how much weight gain was formed on that 00:04:04.72900:04:04.739 intake valve during those 16,000 00:04:07.22000:04:07.230 kilometers now what they found was 00:04:09.02000:04:09.030 pretty fascinating and the set up is 00:04:10.55000:04:10.560 actually a lot like - 2000 engine here 00:04:12.80000:04:12.810 where there are two valves per cylinder 00:04:14.44900:04:14.459 and then there are four intake runners 00:04:16.75900:04:16.769 and then that positive crankcase 00:04:18.22900:04:18.239 ventilation system comes here to the 00:04:20.03000:04:20.040 center of the intake manifold and what 00:04:21.97900:04:21.989 they found in this study with the 00:04:23.18000:04:23.190 solstice engine is that valves 2 4 5 and 00:04:27.50000:04:27.510 had the greatest amount of deposits 00:04:30.05000:04:30.060 formed and so why might that be well if 00:04:32.51000:04:32.520 you see this positive crankcase 00:04:34.01000:04:34.020 ventilation system here it's routed in 00:04:36.05000:04:36.060 and then depending on whichever cylinder 00:04:37.91000:04:37.920 is on the intake stroke that's where the 00:04:39.65000:04:39.660 air is going to be flowing and so the 00:04:41.96000:04:41.970 side that's closest to the positive 00:04:44.09000:04:44.100 crankcase ventilation system got the 00:04:46.25000:04:46.260 majority of the deposits and that's 00:04:48.23000:04:48.240 because those heavier elements those oil 00:04:50.09000:04:50.100 droplets of course go to the closer 00:04:52.25000:04:52.260 intake valve they don't travel further 00:04:54.35000:04:54.360 now those heavier elements don't travel 00:04:56.39000:04:56.400 as far and they go to the nearest that 00:04:58.34000:04:58.350 path of least resistance the quickest 00:04:59.96000:04:59.970 route and they just go straight to that 00:05:01.58000:05:01.590 first intake valve so on this side 00:05:03.47000:05:03.480 that's valves 2 & 4 and then on this 00:05:05.87000:05:05.880 side that's going to be those left 00:05:07.22000:05:07.230 valves valves 5 & 7 so for the first 00:05:10.58000:05:10.590 part of this experiment they found that 00:05:12.02000:05:12.030 yes they will have carbon deposits 00:05:13.88000:05:13.890 forming on the intake valves so for the 00:05:16.37000:05:16.380 second part of the experiment they're 00:05:17.87000:05:17.880 going to run the exact same cycle those 00:05:19.67000:05:19.680 16 thousand kilometers but now they're 00:05:22.22000:05:22.230 gonna reroute that positive crankcase 00:05:24.02000:05:24.030 ventilation system away from the intake 00:05:26.36000:05:26.370 manifold so the intake manifold is then 00:05:28.67000:05:28.680 going to be plugged and you're not going 00:05:30.11000:05:30.120 to have any of those contaminants 00:05:31.37000:05:31.380 traveling from the PCV system to the 00:05:34.01000:05:34.020 intake manifold and what did they find 00:05:36.32000:05:36.330 well crazy enough the intake deposits 00:05:39.20000:05:39.210 forming on valves 2 4 5 & 7 was 00:05:43.21000:05:43.220 dramatically less than when they did 00:05:46.01000:05:46.020 have the PCV system routing to the 00:05:48.35000:05:48.360 intake manifold so what does this prove 00:05:50.36000:05:50.370 well if you can reroute those fumes and 00:05:52.76000:05:52.770 effectively capture that oil like in an 00:05:54.98000:05:54.990 oil catch can then you can dramatically 00:05:57.11000:05:57.120 improve the amount of integral deposits 00:05:59.57000:05:59.580 that are going to form on your engine so 00:06:01.85000:06:01.860 what might we see happen in the real 00:06:03.71000:06:03.720 world 00:06:04.10000:06:04.110 well all of my cars are either port 00:06:05.90000:06:05.910 injected or they run on like electrons 00:06:08.00000:06:08.010 or something so I reached out to my good 00:06:09.98000:06:09.990 friend Charles Hummel mechanic who is a 00:06:12.05000:06:12.060 Volkswagen enthusiast he has spent quite 00:06:14.75000:06:14.760 a bit of time with quite a few direct 00:06:16.91000:06:16.920 injection Volkswagen engines and he said 00:06:19.31000:06:19.320 some experiences using oil catch cans in 00:06:21.71000:06:21.720 direct injection Volkswagens so we're 00:06:23.57000:06:23.580 gonna send it over to Charles to learn 00:06:24.92000:06:24.930 more about that what's up everybody's 00:06:26.72000:06:26.730 Charles from humble mechanic calm today 00:06:28.25000:06:28.260 I'm gonna give you guys some of my 00:06:29.45000:06:29.460 experiences dealing with catch cans and 00:06:31.72000:06:31.730 VW direct injection engines like I got 00:06:34.31000:06:34.320 sitting right here for the most part all 00:06:37.04000:06:37.050 VW gas engines at least in the modern 00:06:39.47000:06:39.480 day are too 00:06:40.31000:06:40.320 Injection which means we're putting fuel 00:06:42.02000:06:42.030 right into the cylinder and while that's 00:06:44.21000:06:44.220 awesome and gives us a ton of 00:06:45.41000:06:45.420 flexibility with fuel timing it does 00:06:47.69000:06:47.700 have a pretty significant drawback and 00:06:49.43000:06:49.440 that is carbon deposits building up on 00:06:51.56000:06:51.570 the backs of the intake valves this 00:06:53.57000:06:53.580 carbon buildup on the back of the intake 00:06:54.95000:06:54.960 valves can cause things like cold start 00:06:56.90000:06:56.910 misfires pour fuel economy and even a 00:06:59.69000:06:59.700 reduction in power something that a lot 00:07:01.76000:07:01.770 of people have done is install a catch 00:07:03.11000:07:03.120 can to reduce the amount of carbon 00:07:04.64000:07:04.650 buildup on the intake valves this catch 00:07:06.74000:07:06.750 can is from Black Forest Industries 00:07:08.51000:07:08.520 retails anywhere from 350 to about 550 00:07:11.87000:07:11.880 bucks depending on how you want to trick 00:07:14.03000:07:14.040 it out and I installed this one on my 00:07:16.37000:07:16.380 2015 volkswagen tiguan i first drained 00:07:19.76000:07:19.770 this catch can at about 3,000 miles and 00:07:22.13000:07:22.140 as you can see there was a lot of junk 00:07:24.47000:07:24.480 that came out of the catch can it looks 00:07:26.45000:07:26.460 like a mixture of oil fuel and water so 00:07:29.21000:07:29.220 Wow I don't think a catch can is going 00:07:31.70000:07:31.710 to solve all of the direct injection 00:07:33.41000:07:33.420 carbon buildup problems I really think 00:07:35.87000:07:35.880 the less of this junk running through 00:07:37.28000:07:37.290 our engine the better off we're going to 00:07:38.87000:07:38.880 be and on vehicles that are modified 00:07:40.64000:07:40.650 this becomes even more important alright 00:07:43.25000:07:43.260 everybody thank you so much Jason I'm 00:07:44.99000:07:45.000 going to throw it on back to you thank 00:07:46.67000:07:46.680 you so much Charles so now let's talk 00:07:48.59000:07:48.600 about how much perhaps should one spend 00:07:50.84000:07:50.850 on an oil catch can so I've got three 00:07:52.97000:07:52.980 different ones here about 25 dollars a 00:07:54.65000:07:54.660 little over a hundred dollars and over 00:07:56.03000:07:56.040 two hundred dollars here so what 00:07:57.92000:07:57.930 features do these have and what price 00:07:59.96000:07:59.970 range makes sense for you so honestly as 00:08:02.48000:08:02.490 far as build quality I've been impressed 00:08:04.31000:08:04.320 with all three of these I don't think 00:08:05.60000:08:05.610 any of them really are that bad of a 00:08:07.64000:08:07.650 decision 00:08:08.48000:08:08.490 so with this cheaper one here this 00:08:10.34000:08:10.350 $25.00 one two the features that I do 00:08:12.29000:08:12.300 like I does actually come with a 00:08:14.09000:08:14.100 dipstick so you can check the level of 00:08:16.97000:08:16.980 contaminants and oil that you've caught 00:08:18.47000:08:18.480 within the catch can you don't actually 00:08:20.06000:08:20.070 have to unscrew it every time so you can 00:08:22.01000:08:22.020 check on that I think that's nice and it 00:08:23.84000:08:23.850 does have a very simple baffling system 00:08:25.88000:08:25.890 to help prevent that oil from going back 00:08:27.74000:08:27.750 up and then traveling over to your 00:08:29.60000:08:29.610 intake it is fairly small and there is 00:08:32.20900:08:32.219 not a drain port on it 00:08:33.86000:08:33.870 so this hundred dollar one here quite 00:08:36.11000:08:36.120 small very nice build quality to it it 00:08:38.06000:08:38.070 does have a bronze filter which is nice 00:08:40.27900:08:40.289 so this one doesn't actually have a 00:08:41.81000:08:41.820 filter on it it just has some baffling 00:08:43.64000:08:43.650 so this has baffling as well as a low 00:08:46.61000:08:46.620 micron bronze filter on it to help 00:08:48.56000:08:48.570 prevent that oil and those contaminants 00:08:50.21000:08:50.220 from going back into your intake the 00:08:52.07000:08:52.080 only thing about it is that it's pretty 00:08:53.27000:08:53.280 small 00:08:54.08000:08:54.090 but nice that it does have that drain 00:08:55.55000:08:55.560 port down at the bottom and then the big 00:08:58.07000:08:58.080 guy over here this is probably the 00:08:59.42000:08:59.430 nicest one I could find when I was 00:09:00.86000:09:00.870 looking around on it different ones 00:09:02.21000:09:02.220 online so it does have a nice bronze 00:09:04.64000:09:04.650 filter right here it does have the 00:09:06.71000:09:06.720 baffling system like the hundred dollar 00:09:08.90000:09:08.910 one also has the drain port there at the 00:09:11.12000:09:11.130 bottom and it's a good size to it so you 00:09:13.37000:09:13.380 know you're not gonna have to dump it 00:09:14.54000:09:14.550 out as frequently you're able to hold 00:09:16.73000:09:16.740 quite a bit more in this of course just 00:09:18.59000:09:18.600 looking at these size-wise 00:09:20.03000:09:20.040 so nice if you have the space within 00:09:22.13000:09:22.140 your engine compartment to stick this 00:09:23.75000:09:23.760 guy it'd be good you won't have to check 00:09:25.22000:09:25.230 it quite as frequently but honestly 00:09:27.53000:09:27.540 overall none of these really look like 00:09:28.94000:09:28.950 that bad of an option the big advantage 00:09:31.13000:09:31.140 to these more expensive ones being that 00:09:33.01900:09:33.029 bronze filter whereas this doesn't have 00:09:35.03000:09:35.040 a filter so you're really relying on 00:09:36.59000:09:36.600 that oil and air to cool and separate 00:09:38.87000:09:38.880 out as well as just the longer 00:09:40.55000:09:40.560 passageway that that oil has to travel 00:09:42.65000:09:42.660 and hopefully you catch it rather than 00:09:44.84000:09:44.850 relying on a filter to make sure it 00:09:46.46000:09:46.470 doesn't go into the engine so you do get 00:09:48.56000:09:48.570 a little bit more if you pay a bit more 00:09:49.97000:09:49.980 but honestly all of these seem like a 00:09:51.89000:09:51.900 butter system than doing nothing at all 00:09:54.11000:09:54.120 now again this video is part of a series 00:09:56.32900:09:56.339 where I have teamed up with RetailMeNot 00:09:58.40000:09:58.410 which has a free browser extension 00:10:00.50000:10:00.510 called RetailMeNot genie that's designed 00:10:03.07900:10:03.089 to compile all the coupon codes out 00:10:04.79000:10:04.800 there so that when you purchase a 00:10:06.20000:10:06.210 product online you get the best deal in 00:10:08.48000:10:08.490 this case we've created a unique 00:10:10.79000:10:10.800 promotion just for you viewers so if you 00:10:13.37000:10:13.380 click the link in the 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