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Do you really want to know what happens
to the crankcase pressure when you install an oil catch can, if you ever
wondered will my seals blow and there will be oil everywhere
coming around stay tuned and I’ll give you an answer to that with my setup on a
1.6 HDI engine same as so this is a Peugeot Partner same as a Citroen Berlingo, 1.6 TDCI
Volvo Ford and so on so here is my setup so this is the
intake I’ve replaced the original intake with silicone hoses going to turbo so I
have a Ford Focus part from the crankcase breather going to the oil
catch can and it’s coming back so it’s a closed circuit so I’ve already
done that with a manometer so check out my video if you want to see that but
this time I decided to do it properly with a sensor that can measure precisely
what the crankcase pressure is inside the engine under load not just under idle
but under low comparing with the original and with this new design
with the oil catch can so um the short answer to this so if you don’t really
want to watch anymore there is not really any significant difference
between the crankcase pressure with the oil catch can versus the original
without the oil catch can so you might want to stop now but I will show you proof
why with several graphs and data why there is not really an increased
crankcase pressure with the kind of similar to Mann-Hummel Provent 200 oil catch can or this is kind of a carbon copy so this is really what i’m using so I
have a replacement oil filler cap that I’ve screwed i have another video how
i’ve done that if you want a search so that’s how its inside its just screwed
on the plastic I’ve drilled it put a normal hose and
I’ll have another video but I’ve bought a brand new Bosch differential DPF sensor
so this really hooks up to the DPF pre-DPF and this is after the DPF
it really measures how much blockage is there in the DPF, well my
car doesn’t really have a DPF so but I purchase it online it’s pretty cheap
it’s an analog sensor so it’s up to one bar from zero to one bar it can measure
negative pressures as well up to a certain point so I’ve really hooked up
this differential pressure sensor to the cap to the oil filler cap
and I have so this is the positive 5 volts, it’s an analog sensor
positive 5 volts ground and and the signal so this is really fairly long
cable that will go inside the car, so it will hook up to an Arduino
where I can measure how much exactly is the pressure so here is how I’ve hooked
up the sensor so this is the oil filler cap with a hose barb hose
90-degree brass thing so you get the hose and the sensor is hooked up
here so it’s kind of away from the engine it’s not too warm and not much
air we’ll go around that side this is open to measure kind of the atmospheric
pressure the cable goes around so it goes around and goes kind of underneath
here and goes inside the cabin so here it is how it goes in the cabin I
haven’t really so basically just slots around this in this gap underneath
here and then goes inside the cabin so the Arduino will be positioned there so here
is the sensor hooked up to Arduino so the positive is on 5 volts
the ground is on ground and A0 for signal and before going for a test drive
to see how this works out here is how it’s on the screen so this is
zero so currently it’s reading about zero millibars so this is it so I’ll
have a separate video and I have a description of the sensor and the code
is in the description of the video so if one really want to do that go into
the description of the video everything will be there what do I really expect to happen
under load with the crankcase pressure so let me remove that cover so
this is the rocker cover and this is the the PCV valve or CCV valve or a
crankcase valve positive pressure regulator wherever there’s all sorts of
names but it’s just it opens and it goes into the catch can and then goes back
and goes into the turbo here’s the oil filler cap so I really have a
spare one of these rocker covers just for illustrative purposes right so
the rocker cover there are several channels so this is the oil filler cap here that
I’ve used for the replacement that I’ve drilled and I hooked up the hose so I
can measure the crankcase pressure so the several gullies inside kind of
separates the oil and then really the pressure comes out of comes really out
of this hole not the pressure but the the oil vapors and so on come out of this
hole so inside there is there is a rubber membrane that kind of goes up and
down that’s about it and there is a small spring inside and the only
connection between this where the gases come out and here is only this hole
there is nothing else inside so there is a small hole the white bit there that
when the gases kind of hit this rubber they condense and drop in this in the crankcase so they drop down in the engine
so also only gases are supposed to come in sometimes it is a lot of oil
vapor as well the purpose of this membrane really when when the turbo
start picking up so it sucks well it sucks air from here from the airbox from
the filter but it will also suck air from here that just how it happens
so what this happens is were really picks up spools up you don’t really want this
sucking too much air otherwise you get all the oil sucked out of the engine so
what this does there is a kind of a dimple there presses against the spring
and kind of closes but it doesn’t really close completely so it doesn’t
really push completely so there is still some some drawing of air so in that case
when the turbo really picks up there will be slight negative pressure inside
so the more wide open throttle there is that the more negative pressure there
will be up to a certain degree this will when this presses down it will
really limit that so under idle so what happens under idle,
so under idle there is not really that much air going inside not that much air
flowing so this really doesn’t close so it stays quite open so the pressure
inside the crankcase kind of builds up and it kind of comes out under idle so
there will be slightly more positive pressure under idle then when the turbo
picks up so the other set up is let’s say once you have changed to
third whatever third and you really pushing pushing the car up, the turbo will be spooling so there will be a bit of a negative pressure
inside so will pull out a bit of the of the gases, a bit of the pressure outside
but then you start cruising that’s a third or a fourth on the motorway
it doesn’t really matter where so you’re cruising so there isn’t really
that much need for power so the waste gate of the turbo will
slightly close so there isn’t that much air coming inside here so there isn’t
really much pulling out from here so this will actually slightly open this
membrane will be slightly open and it will be nearly the same as idle so it will just
puff pressure out the other thing is so if you’re coasting in gear downhill then
in that case it’s basically sucking air so it will be really basically the
engine the cylinders really want air because you’re coasting so in order to
not to do any say pumping losses where you it’s just working against it
so the EGR valve will be open as well so there will be some air but this will
also draw some air so it will create negative pressure so this will
also slightly close and there will be but there will still be negative pressure
inside so the pressure will drop once once you coast I think I’ve covered
pretty much everything but I’ll have to see in the test drive
that that’s what I’m expecting to see so this is the rocket cover here this
position so this is already really what I’m expecting to see and now go for a
test drive so I’ll go for
a test drive with the oil catch can and actually have a look at these
different situation see how what the sensor is picking up, so I did a test run
with with the Arduino and the sensor in the in the oil filler cap and this is a
video that I did with my laptop in inside of the car but so I couldn’t
really look at at the laptop and watch the road as well so this is just a video
so I have a voiceover on that so on the x-axis is really just the time so this
will go along on the y-axis is the actual pressure in
the crankcase in millibars so three here it’s millibars here is zero so currently
I haven’t yet started the video but this is this is the zero just before starting
the engine and anything that is negative means that there is a kind of a slight
vacuum in the crankcase so how did I do all this together so for each of these
tests with the oil catch can and then with the original intake air intake I did two
runs kind of to warm up the engine, exactly
the same route, so I was doing roughly about twelve minutes around my house so this
involved a few roundabouts a few junctions and a bit of a road going to
about 50 mph then in order to warm up the
engine then on the third run I was really recording but I recorded all
three runs each three individual runs but basically I’ll be looking at the third
run because the engine is in operating temperature and I can kind of compare
the two they were they were more similar because I cannot really influence the
traffic if I cannot really get all the cars away and then do exactly the same run
so I mean it’s fairly approximate but but it’s pretty good so to start it so I will
start the engine now, this is going along kind of in zero and this is the
engine and the idle let me stop this so here’s really the engine starting and
there is a positive pressure because there is not enough a air drawing creating
vacuum in the crankcase so it’s kind of I mean this will go along and it’s roughly about 1.4 mbars in idle I think I
had another, I have another video not I think I have another video where I did
this with a kind of a U-bent hose with water inside and did some calculations I
wasn’t really too sure if that’s any correct I mean I calculated there 1.37
millibars of pressure and yeah I wasn’t too sure if that’s accurate I thought that it’s
fairly accurate but but who knows some error measurement but this is roughly
about 1.4 mbars so this is actually my previous manometer is quite
accurate and I’ll probably stop the audio in a second because it’s it’s a
bit distracting so here is just giving it a bit of gas I’m still not really
going just a bit of a gas there is a the pressure really decreases so the turbo
slightly picks up there is more air and this is close really to 0 to kind of
atmospheric pressure and then releasing it then I’m given a bit of gas for quite
longer so it’s slightly 0-0.5mbars about probably less than that and
then of course idle it’s about what this is about 1.5-1.4 I think it’s roughly about 1.4 I have to say
something else that I mean the sensor is really sensitive so you see these
squiggly squiggly lines I mean I performed a lot of smoothing on the
signal so it’s not really raw raw signal otherwise the raw signal was if
you see my mouse here it was going up and down up and down up and down really
a lot so I did a bit of smoothing because for the with the water manometer
the water has some inertia right so you can’t really pick these
pressure fluctuations so when it’s really very quick this pressure
fluctuations that happen in the engine you get only a small it doesn’t
really move that much the water where here it really moves quite a bit so
there’s a lot of bit of smoothing go and so if you put your hand above the oil
filler cap while the engine is running you see how it
pulsates that the pressure really pulsates, it is not that smooth, so in
order to make it smooth I’ve made a few so let me stop that so don’t really pay
attention to this I was driving so I have in my ear what I am doing
changing clutches where I am so I would know what I’ve been doing I
mean this would be easier if I put more information what kind of gear what kind
of rpm and so on with the Arduino but this is I’m really only testing the
pressure so I can I can explain what is being seen so really here I’m waiting at
a roundabout and it’s really basically idle waiting to join so then it will be
first first gear and then and and then going off so this is really let me see
so this is really first gear so when you well I don’t punch it but you go in
first gear there is a really drop in pressure in in the crankcase then
pressing clutch so it slightly rises and so then this is second gear
and then second gear it goes it goes negative so the turbo picks up sucks a
bit of quite a bit of air that the membrane closes down but it cannot really
closes, cannot really close that much enough so then so this is first clutch second then clutch
so pressurizing again then clutch and then third so here I’m traveling third
giving a bit of a bit of a gas and then it’s actually going around roundabout and I’m
actually travelling I’m not really doing much I’m not really applying too much
pressure so it’s kind of below the idle but it’s still quite a bit of pressure
so I think here it’s clutch and going to fourth and then again this is not really
so this is not really it’s kind of travelling but not really applying too
much just basically going along not really
applying too much again so it’s actually the turbo doesn’t spool that much it
only operates whatever 10-20 or 20,000 rpm so it’s not really
drawing that much air so it because there is not that much power needed it just it
just goes along so here on this one I was approaching an exit route so I
really put my foot off the gas and just let the car to let it slow down with
in gear and that’s where you really build up quite a lot of negative
pressure it goes about I’m not too sure probably 1.5mbars
so then a bit of gas I think this is fourth or third so
this is going around roundabout going just steadily not really that much gas so
that’s why it’s just above just about the zero then a bit of gas in third then
clutch fourth and this is really fourth it’s picking up quite a
negative in the crankcase because it’s he turbo kicks in you want power so
then this is the clutch so when you press the clutch really they’re not that
much the turbo spools down and actually the pressure kind of rises so then
clutch and then this is 5th going 5th and then I think I’m approaching an exit junction
or going into a junction and then it’s basically slowing down the car
using fifth gear and basically this is a negative pressure in the current case
because you it’s not there is air going in so which is which is sucking and but
but then the wastegate really stops kind of for the turbo to to run that much
because you don’t need that much turbo so there is this air going on so it’s
kind of sucking the crankcase oh it’s a negative pressure in the crankcase
well then there is clutch so this rises up so this is really waiting
before a roundabout so it’s kind of idle so it’s kind of about 1.5 or
so so this is really first going pretty steadily in the negative so this is
clutch going and this is the clutch which the pressure slightly rises then
this is second clutch so this clutch going third and then this
is third which I’m going just around the roundabout and it’s about idle so it’s
actually nearly the same as that of this is going third around the roundabout not
really putting too much gas just going along keeping I don’t know it was
fairly big roundabout so it’s roughly about 30mph or 50kph so this is really going around the roundabout so this is gas
into third so it goes quite negative so then clutch fourth it really goes quite
negative actually because I was trying to pick up speed in order to join
an A road so this is the clutch and then fifth so this is really a bit of
negative pressure from from the fifth it goes again quite well that’s I mean
releasing so it’s not really continuing so it’s not it’s not I’m punching it
absolutely so there was probably another car or something so this is really
joining an A road so I’m applying the gas a little bit and then this is really
starting a cruise control here so I’m travelling about 50 mph here
and I am in cruise control and this is roughly about if I stop so I have to
wait it but it’s it’s just slightly under idle so when it’s travelling
just cruising this was 50 mph fifth gear I don’t know how many rpms 2000-2200 rpm so something like thatI do not know, 2000 rpms let’s say I
don’t quite remember so really it’s quite actually
doesn’t really suck that much air and doesn’t really generate that much air the
EGR is open so it puts a bit of air inside so it doesn’t really suck that
much that doesn’t really suck that much air through the air filter so you
get so you really get some some pressure well

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