Hello, I just found your videos a few days ago and now I'm subscibed! Just a fellow mechanic that does things on the side now and love to watch and learn. I graduated from Northwestern Auto/Diesel in Lima, Ohio back in 95. That school has come a long way since I was there. They were adding the high performance section when I was about half way through. I had to learn OBD2 on the job and back then, at the school, we were taught the workings of all the sensors but not so much actual scan tool use. Can you remember electronic mixture control solenoids on carbs lol. These kids nowadays have it pretty easy if you ask me. The scan tool practically tells you what is wrong. you just have to know how to interpret it. And if you can use a scope your in there. Well I better get on to work, I'll watch the rest of the video later. Thank you for the in depth explanation of what your doing.

Great video Matt! I made this post in your other video but I meant to place it on this video. Flat rate master did a pretty cool video about head gasket testing and he mentioned an interesting method of pressurizing the cooling system and looking in the cylinder with one of those endoscopes for the appearance of wetness on top of the pistons......thought that was a pretty neat idea. Although I guess it doesn't help you when half of the plugs are under the intake manifold.

Very good video. Had wondered after watching the previous video if something was creating a check valve effect in the cylinder where the gases or fluid sealed the leak under compression. I like the ideal of using the leak down test using the bottom cycle of compression instead of the top. Love to watch your videos, have learned so much, wish I had more time to read all the comments there seems to be a wealth of info/wisdom on this channel. Keep up to great videos and great comment guys. Stay Safe & Good Luck

@SchrodingersBox

Жыл бұрын

Yes another viewer had the same idea calling it a "flap effect"- such that the gasket failure is in a way that coolant draw in with vacuum but pressure partially seals the "flap" causing the effect you describe.

I FEEL SO HONORED MATT, THANK YOU !

Hey Matt. I retired out of the industry last August due to some health issues. The compression gauge isn't lying, the cylinder has the capability to seal under the relatively low pressure of the compression stroke. It's the combustion pressure that will push past the gasket and cause overheating. It used to be a common issue with the Cadillac Northstar engines. Sometimes you would have to drive them for an hour in order to even get them to turn the block tester fluid yellow. I've also had the same issue with Duramax LB7 and LLY engines. My theory on why you can create bubbles in the radiator using a leak down test, is simply that the test is sustaining the pressure much longer than a cranking speed compression test does. Last year for Bandamire. See ya at Casa Bonita.

You hit this one outta the park ! Very helpful ! Thanks ! How about in cylinder ignition wave form analysis to get information on the spark line & firing line quality . Interference to the flame front due to contaminated air fuel mixture / ionization . Thoughts ?

Great video. I'm looking forward to seeing the video on the Jeep.

@SchrodingersBox

Жыл бұрын

I can't wait man!! We gonna take it higher!!

Looking forward to the video.

Awesome! I cant wait to see the transducer test in cooling system

@SchrodingersBox

Жыл бұрын

I am getting the car this week!!! Yes I am super excited about this. It will be a very important video as we not only 100% solve the mystery on why this phenomenon occurs, but also how to diagnose around it!!

@mikesabin8568

Жыл бұрын

@@SchrodingersBox great channel matt

Thank you! I love you scientific approach!

@SchrodingersBox

Жыл бұрын

Me too lol!!! It’s the only way to do it!

Sorry I skimmed a bit of the video but I think something you didn't mention but will help is to use an overlay on your scope when you do the ignition plus pressure sensor. Some scopes have them built in and there is also a separate little program overlay that you can use with any PC based scope. Pretty much the overlay just shades in all the different strokes for the different cylinders automatically.

I love cylinder leak down the best but it’s a big job when plugs are under intake. Makes it more time consuming but more accurate. 👊🏻 my first leak down gauge was a moroso in the late 70s it just broke year ago and I got a Lang . Hopefully it will last as long . Another great video. Also agree I love reading comments soooo many smart folks on this channel

@SchrodingersBox

Жыл бұрын

Totally agree!!! Yeah don't worry- I think we are going to be able to show a way we can quickly diagnose this condition without having to access the cylinders and perhaps even without using a scope. Next video will show this!!

@sheerwillsurvival2064

Жыл бұрын

@@SchrodingersBox excellent

A few months ago @fordtechmakuloco did some videos on coolant loss in Ford Ecoboost 4cyl engines where the compression was OK, but the symptoms were loss of coolant and a misfire. He discovered the leak into the combustion chamber by pressurizing the cooling system and using a borescope and could see the coolant dripping between the head and block. Just another method that can be used to help diagnose these types of problems. --edit, nevermind, you just mentioned this method. Guess I should watch the entire video before commenting :)

Matt, any liquid entering the cylinder will not have the time or mobility to exit the cylinder during a compression test and, as shared, the liquid (coolant) itself is incompressible. It would be interesting to see how large of a leak is needed to be detected by a compression test. Regardless, the compression test is worthless for detecting a small coolant leak into the combustion chamber. Period. Simply better options available (as illustrated in the video).

Very interesting discussion! I'm definitely not the sharpest tool in this shed, but I would think the combination of fluid and air in the cooling system would act as an "accumulator" and dampen any pressure readings you may attempt. If the cooling system could be filled with fluid to the point where there is zero air, the pressure sensor should indeed work. But purging ALL the air might not be possible. Conversely, if all the fluid was drained, I believe the sheer volume inside the cooling system (and possibly all the restricting small passages and such) would render this "air only" method ineffective. The small amount of air being pushed back into the cooling system during dynamic cranking would be minimal compared to the volume of air already inside. You would also have to consider the hoses (radiator, heater, etc) that would absorb some of the pressure changes. I used to think that the "check valve" effect of the failure was a possibility, but no so much anymore. Now you have convinced me that the "time" factor is the difference. I'll be looking forward to follow-up video(s).

@SchrodingersBox

Жыл бұрын

I think you are pretty sharp!!

Indeed i think its a case of duration of pressure x peak pressure i.e. area under the curve. The leakdown test might be lower pressure at 90psi but has far higher time at that pressure, im guessing under cranking it would be >=90 psi for only a few ms at a time for a small % of the time. There certainly was some compression loss as the cooling system was pressurised from cranking alone, but obviously not in a way that significantly affects compression test results or the compression alone. Of course when you take combustion into consideration peak pressures are far higher and pressure is higher for a far longer part of the cycle then. Or indeed it could be a crack far from the combustion chamber in the cylinder, but i would imagine that having that occur from an overheat is far less likely than a compromise in the head/block mating surface.

Putting my thoughts down before I finish the video. My hypothesis is that a compression test/relative compression test is only testing peak static compression. The compromise to the cooling system is going to be very small whether a crack or a bad gasket. That would leak out the compression very slowly compared to the exhaust valve opening and relieving the pressure. The leak down test is a constant pressure, compared to the relatively quick timeframe that the cylinder is under pressure in the compression stroke very quickly falling off as it enters the power stroke. Of course the peak compression under combustion is much higher as well. Also, glad you're going over inverted signal for the voltage drop, that was not looking right to me during the last video and now it makes perfect sense.

@Silverfang15

Жыл бұрын

Aha, the syringe model would lend towards this hypothesis, but retesting after taking the coolant out of the cooling system would be worth testing for sure.

@SchrodingersBox

Жыл бұрын

Great comment, totally agree. We are going to test for it!!

It can pull in coolant easier through the leak because as the piston is going down, it pulls vacuum-- which can give a slight "boiling" effect and pull in more coolant vapor through the leak; which also acts as a kind of one way capillary effect. Then on your up stroke with the coolant now in the cylinder, it is increasing pressure, which is making it increasingly harder for the coolant to vaporize, which helps to block it from going back out of the leak hole so easily since there is a much higher surface tension when it remains a liquid; and ultimately it then gets blown out of the tailpipe as white smoke. This implies that the leak is small enough to act as a one way check valve just due to the changing state/phase of the water from a liquid to a vapor.

Great content as always!

@SchrodingersBox

Жыл бұрын

Thank you!!

This is probably a little more theoretical than practical but if you put a steel band around a radiator hose like an oversized hose clamp for the hose size and then a pressure sensor between the band and the hose (you would want a relatively flat sensor) you may be able to pick up pressure pulses in the flexing of the hose with pressure changes although a strain gauge or piezoelectric sensor might work a little better. If something like that could work (which is largely dependent on how much flex in the hose you get for a change in pressure) you bypass issues with taking off a cap in the cooling system. Admittedly, this is a completely untested thought and there just might not be enough flex in the hose to be measurable. When I was looking to see what was out there along these lines I came across that they often use Laser Triangulation to measure distances of curved surfaces. Looking around I saw a laser distance measurer for about $60 that could measure to a 0.1mm resolution. It would be interesting if all as you had to do was point laser distance measuring device at a hose (ignoring the issue that you would need it to have a real time output you could send to an oscilloscope) and could see pulses. I suspect that wouldn't be possible because most probably vibration would over shadow the pulsing so you would lose the signal in the noise but it is an interesting concept.

@SchrodingersBox

Жыл бұрын

Genius idea!!! Really that's awesome-- like a digital blood pressure cuff hahaha.

@justdata3650

Жыл бұрын

@@SchrodingersBox LOL, exactly. Damn if you could hook a blood pressure cuff up to an oscilloscope and wrap the cuff around a hose that would be an incredibly easy setup... and fun. There's still the dependency on the sensitivity of the sensor and the flex in the hose but it would be fun just to experiment and see what you can get.

You said the vehicle was huffing white smoke (steam) from the exhaust, which means coolant is somehow getting into the combustion chamber. Just because the other garages made futile attempts, if they attempted at all, to determine the cause of the white smoke and didn't, or couldn't find anything, doesn't mean a problem didn't exist. If there is an obvious problem, which in this case there is, and you can't find it for whatever reason, the right thing to do is stand tall and say, there is a problem but I can't figure out what's causing it. The actions of the other two garages are indefensible, in my humble opinion, but I hold myself to a very high standard, as do you.

This may be a duplicate comment, but I was recently burned with a head gasket failure on a 2001 x-trail (pretty common, apparently), it started perfectly when cold and no bubbles were produced in the radiator neck, albeit it was a cursory check in the field for a friend, but when I examined the car again hot, it was spitting coolant out the exhaust and missing badly - only at idle and in gear. There are different failure modes for head gaskets, my experience had always been that it would start rough and misfire, etc. It's useless posturing, but I'd imagine it would have passed even a leakdown test in this rare example with how perfectly it ran cold. I guess the difference was an MLS vs the old style head gasket that's pretty easy to diagnose when it's failed, because it's as if it was only drawing coolant in under cylinder vacuum, not pressurising the cooling system and not pooling coolant in the cylinder after shutdown.

I ve been waiting for this video...😊

@SchrodingersBox

Жыл бұрын

glad to hear that!!! and it will get MUCH better when I can apply this on the same exact jeep!!!

5:35 That creeped me out too. As soon as I felt creeped out you said it. 😂😂

@SchrodingersBox

Жыл бұрын

Hahahahaha yeah it was literally making me dizzy lol!!!

Great videos very informative I would have to try blue devil nothing to lose

@SchrodingersBox

Жыл бұрын

I will!!! Thats exactlyu how I got them to bring the car back! I said I would try this as a last resort at no charge.

i had one if you left radiator cap loose ran good would have thought all is good. but if you left cap on and set over night the cylinder would have coolant in it and would skip for a few seconds on cold start up. and would over time loose coolant.. but if when you turned off vehicle waited a few min opened radiator cap released pressure would start and run perfectly the next morning. also the spark plug in that cylinder was always cleaner than the other plugs

Thank you for the comment. I will work to improve.

@SchrodingersBox

Жыл бұрын

Hahaha I hope you dont change a thing!

It is always nice to find ways to diagnose things without the teardown - I was raised with engines that all of the plugs were accessible but now after 20yrs of being in the automotive field, these newer engines require too much to get to them. all of this information is helpful. I have had one recently that has me baffled. on a sensor with a +5v, GRND, and a signal. the +5 is good, and the ground is good but when I disconnect the sensor I find I am getting voltage back on the signal wire from the PCM. I suspect a PCM fault since there is nothing else on this circuit. but I Have had a hard time finding a definitive answer to it. Diagnostics can be fun and rewarding but, also can be frustrating if you don't understand the proper behaviors of the specific system.

@DillysADV

Жыл бұрын

PS I currently live in California and don't know why either!

@SchrodingersBox

Жыл бұрын

Yes it sounds like there is a bias voltage on that signal wire. I see this from time to time. It’s used by the PCM to determine if signal wire has an integrity issue.

@DillysADV

Жыл бұрын

@@SchrodingersBox thanks, that makes sense, I could not find info on it anywhere. Just a lot of people replacing parts.. thanks for your vids diving into diag techniques.

Watts law where Power(watts) = Voltage times current. If voltage increases, current decreases. They are inverse. In Ohms law Voltage = Current times resistance(ohms). Voltage and current will follow one another. They would be proportional. Another way to say it is resistance(ohms) = voltage divided by current.

The piston rings already present a known leak, albeit minuscule, and thus forms a baseline for any maximal attainable pressure. If the size of a crack in the cylinder or head gasket is of the same order or smaller it's likely to not register easily in compression testing (or it just gets lost in the overall noise, and dampening introduced by the rubber hose down to the gauge). The time spent in compression stroke is short and the volume of air compressed is fairly large, so a small crack can't possibly have time to leak enough air through during a single stroke for the overall maximum pressure to get a visibly lower reading on an analog gauge that would stand out enough relative to other cylinders. Compromises that are larger than the natural leakage of a cylinder, such as chunks missing from a piston, missing sections of piston rings, and stuck valves, etc. are another story and compression testing can of course rule those out qiuckly.

@SchrodingersBox

Жыл бұрын

Good point about the rings being the limiting factor.

I'm curious if you drained all the coolant and ran the engine (for a short term, obviously..) and see if the misfire goes away. Under those circumstances, there'd be no coolant for the cylinder to draw in. Granted it may draw in air and run lean, but I'm curious if it'd be enough air to create a lean misfire. Either way I think a pressure transducer on the coolant tank is surely a key test to run along side the relative compression test. Really sad to see the relative compression has become more of a "loose" tool than a definitive absolute direction-giving tool. Lastly, a borescope in the cylinder while the cooling system is under pressure has a huuuuuge advantage: you can see physically where the damage is coming from to make the teardown and inspection easier and zoomed in on where the problem is. Or, it can uncover a crack in the cylinder or something that may make the immediate decision to scrap the vehicle without any teardown costs. Eric O has an awesome video on the coolant system pressure transducer test.. kzread.info/dash/bejne/l21no4-IZru8Xco.html

Yanks Matt. Very educational.

The "NEW" nomenclature that you are looking for is 'egress'. There is egress of coolant into the cylinder. The egress could be through a crack, head gasket, stuck valve, blowby, etc. or all the above-- who knows. The point is that there is a break in the seal somewhere. Egress is the word you're looking for.

@SchrodingersBox

Жыл бұрын

I like it!!

@calholli

Жыл бұрын

@@SchrodingersBox I think "Ingress" is actually the correct word. Egress is to exit, ingress is to enter.

Isn't there going to be a time delay between the pressure wave coming from the cylinder before it reaches the transducer? So you could use it to verify you have a leak (in theory), but I'm not sure how you're going to compensate for the time delay to determine which cylinder it is in accordance to the trigger on the scope. The velocity of the pulse could also be hard to detect because it has to move through a considerable amount of liquid and lost its momentum. And if the leak is small, it wouldn't have enough time to create a pressure wave that is clearly visible above background noise from the pump. Another option would be to do it the other way around, where you pressurize the cooling system, remove the spark plugs and crank the engine. Whichever cylinder is leaking will spew liquid out of the spark plug hole. Granted, you'd have to remove all 8 in this case. As for the leak in the cylinder wall. That would make water leak into the oil pan. Meaning you'd be able to see sludge eventually?

Is there a way to freeze with liquid nitrogen and then test fluid retention under pressure to see if any fluid is escaping back into the cooling system or out a crack?

shouldn't it work the other way around that the leak shows up when cold but seals when hot and the heads expand?

I suppose coolant in the cylinder could improve compression by sealing the rings, the way you put a few drops of oil in the cylinder to help diagnose bad rings & throw you off the scent,

the pressure transducer might ALSO pick up the vacuum of the fluid being drawn in.

A good thermal imaging camera may give you direction on the next temperature diagnosis.

@SchrodingersBox

Жыл бұрын

It is sooooooo funny you mention this because I was literally just contacted by a company to do a review on a thermal imagine camera product hahahaha. I normally turn them down but I agree with you- I think I need one.

This is an interesting one. There was clearly a compromise in the cooling system and the cause is not necessarily a blown head gasket. The misfire counter identified the problem cylinder which was confirmed by the leakdown test. A borescope would help confirm that there was coolant ingress and the source of the leak would clearly show up if the cooling system wss pressurized.

@carnivorebear6582

Жыл бұрын

The borescope is just as problematic as a leak down test though, unless you've got a misfire code from the PCM to narrow down which cylinder you're still taking every plug out 1 by 1

@Parknest

Жыл бұрын

Yes, it is the same situation as with the leakdown test but the borescope would be useful once the problem cylinder had been identified and would hopefully show the exact location of where coolant was entering the cylinder. Then there's the rabbit hole of finding a cracked water jacket in either the head or the cylinder bore. One way or another the engine is most likely condemned. Form what I can gather, most shops wouldn't even bother pulling the head(s) and just fit a replacement engine.

@SchrodingersBox

Жыл бұрын

Yep carnivore is right and in fact I meant to mention that as a gap in the video. The borescope is a great idea but you have to know which cylinder to borescope. It is useful for seeing where the leak is in the cylinder but we need a method to identify that cylinder without testing every one individually.

@Parknest

Жыл бұрын

Yes, I agree that there needs to be a an easy way of identifying a problem cylinder. This is where the scantool comes in. They're virtually essential for modern cars these days.

When you were doing the compression test did you disable fuel by pulling a relay or fuse or were you able to shut fuel off with the scan tool? I got my Xtool D7 a few weeks ago. love it.

@SchrodingersBox

Жыл бұрын

Oh great question- I actually did it using fuel cut off mode by just holding gas pedal down all the way while cranking.

It had me going off to look up the difference between "complicated" and "complex" - I decided it was probably the latter.

Matt, how about 'leaky cylinder' for the nomenclature for any compromised cylinder...would technically cover everything, bad valves, rings, cylinder walls, cylinder head, head gasket, piston?

@SchrodingersBox

Жыл бұрын

Love it! Works for me!!!

Ever day a school day, I just presumed that the gas tester was looking for Carbon monoxide and not Co2, thanks Matt.

@SchrodingersBox

Жыл бұрын

Yes its CO2. You can actually turn the fluid yellow with your breath.

put secondary ignition on scope you will see a difference on the bad cylinder. The computer in the car can see the misfire and you should be able to see it too.

The compression test didn't lie, it just didn't provide you with the information you needed to come to a conclusion. In that case you just continue to use the scientific method until you do obtain the information you need to come to a conclusion which is demonstrably correct, and you do flawlessly, every single time. That's what scientists do.

@SchrodingersBox

Жыл бұрын

Yes agreed. It didn’t lie. It gave the actual compression.

Regarding the transducer and collating to the cylinder compression: Do you think there would be a timed delay? I am on the side of there would be enough delay that they won't line up equally.

@SchrodingersBox

Жыл бұрын

There will absolutely be a times delay. You will see it soon in fact- video is almost out!!

@ifell3

Жыл бұрын

@@SchrodingersBox awesome

also a air particle is smaller than a water particle that is proved in home building Felt used to waterproof roofs will let air particles thru but not water particles

Hi Matt, thanks for the great video! I removed my comment because you answered it so well. I have a question for you for the future. If you were looking for a compression test, I would be interested in knowing if a radiator compression test while you're doing individual cylinder compression tests would be a useful way of determining in which cylinder is the exact problem! Because, if you eliminate the problems to the individual cylinder and you have your radiator compression tester on, you should see the PSI increase for the radiator compression test, indicating a blown head gasket. Would love to hear your response :) P.S., would be AWESOME if there was a way to make a compression tester a radiator tester

@nukesploder

Жыл бұрын

Hi Matt, thanks again! Another secondary thought, though I apologize if what I'm saying, both in my last comment and here sounds dumb lol. If you took out the, Oil cap, you know where you have to remove the oil cap to pour in oil through the valve cover, and then you did a compression test. Would you be able to, if you put you ear to the cap, be able to HEAR the leak coming out of the cylinder, even when there's no compression lost? I wonder about that too both with the oil cap and the radiator cap. Thanks a million!

@SchrodingersBox

Жыл бұрын

You won’t hear it through compression test but you will definitely hear it through leakdown test IF the leakdown is past the rings.

I wonder if a dirty cylinder can seal a small head gasket leak when testing the compression, but yet somehow allow the coolant to leak into the cylinder. Just a thought !!

@SchrodingersBox

Жыл бұрын

Yes I have thought of that too- I described it as “flap effect” where it seals on compression but the leak is present on suction. I do believe there may be some possibility to that.

yes but you can't turn the engine with the camera in the cylinder, so how would you see the coolant leaking in. I see a silver-looking color in some of my cyls. but the engine stopped. dodge ram v8

@SchrodingersBox

Жыл бұрын

you can pressurize the coolant first.

Maybe you Would see it on a kompression test wen you open the coolent lid

How can you differentiate the normal variations in cylinder compression with an actual compromised combustion chamber? It seems it would have to be a large difference to even suspect it and if that were the case you might be able to hear it when cranking. I don’t know. My head hurts. 😁

@SchrodingersBox

Жыл бұрын

Next video will make your head hurt even more hahaha- but it will explain it.

A pulse sensor on radiator neck will show it too no need to drain coolant

Hi. I'm sorry if this is a foolish question due to the answer probably being mentioned in the video. I just wanted to verify is a leak down test the best test to find an internal coolant leak? Would it prove exactly where said leak is or would it just narrow down possible areas but not one exact area? I appreciate any help. I like how descriptive you are and show all the possible scenarios.

@SchrodingersBox

Жыл бұрын

Leakdown is the best one. It not only confirms the leak but also tells you where it is by listening to where the air exits (or seeing the coolant move). It also works no matter where the leak is- so for example the awesome radiator pressure test was great but it won’t detect a valve leak. I absolutely prefer the leakdown over all else. The only downside is it’s laborious and it only tests one cylinder at a time.

@ayayron10

Жыл бұрын

@Schrodingers Box thanks for the quick response. I am nervous my engine has a small coolant leak, and it has passed a pressure test with no signs of external leaks. The shop I usually go to topped off coolant and said keep eye on it for 2 weeks until I come back for my oil change and they will do more test to see if there is a internal leak. I have been checking every day, and it seems to be at the same level, but when I really begin to see a drop in the level, it's after 4 weeks or so of driving. I'm just hoping it isn't actually a major repair, and driving it this past week or so isn't causing more damage.

@ayayron10

Жыл бұрын

Should also mention no overheating, no white smoke, no milky oil, and no stalling. So far, the only issue is the lowered coolant level in the reservoir. I appreciate your videos, though, because they are making me look at things more, with a little more understanding than I have prior.

@SchrodingersBox

Жыл бұрын

I would absolutely do the leakdown test for sure. It’s also possible you just have an internal coolant leak with the intake which is pretty minor. I have seen than many times too.

@ayayron10

Жыл бұрын

@Schrodingers Box thanks you for the advice. I will pray that is the case. Do I want to have the dealer service center do said work or should I try to find a local mechanic that does engine work for a job like that (assuming that is the issue).

So I had the following measurements on my I4 engine: 255, 255, 255, 260 PSI. The spec for the engine is 203 PSI. I figured my gauge was wrong, so I borrowed my neighbors gauge, a brand new still in box Snap-on gauge and got exactly the same result. How does this happen? I can see being off a bit, but 50 PSI?

@SchrodingersBox

Жыл бұрын

Sounds like carbon buildup in engine or it could be timing is off a tooth.

@ProfessorOzone

Жыл бұрын

@@SchrodingersBox Thank you for the reply. I've borescoped the combustion chambers and checked the one tooth off scenario, because it lines up with other issues the engine is having. But I don't understand how the timing being off could INCREASE compression.

Would your 'sizzle' test have caught the bad head gasket? Do you still like that test?

@SchrodingersBox

Жыл бұрын

It did and somehow... sadly, I somehow missed it in the edits!!!!! It absolutely caught it and yes its still one of my favorite and most reliable tests!!!

@CA-pv5ie

Жыл бұрын

@@SchrodingersBox Awesome! Love that one! Thank you!

@SchrodingersBox

Жыл бұрын

Watch it in the next video tomorrow…. You won’t be disappointed.

Interesting that the KZread algorithm is suggesting Scotty's videos to you, man... Is that what you've been watching???

@SchrodingersBox

Жыл бұрын

Hell no!!!!!!!!!!!!! I think it’s because in the past I used to put comments from his videos up in some of my videos to show how dumb his viewers are lol.

Tutorial brilliant, thank you , Schrodingers Box 👍 CANNY Schrodingers Box From Nick Ayivor from London England UK 🇬🇧 ⏰️21:29pm

👍

You never said what the leak-down percentage was for the bad cylinder.

@SchrodingersBox

Жыл бұрын

Hahahahahaha!!!! No I did not lol!! I was so excited about the coolant popping out!!! I didn’t even look at it lol!!!! In the next video we will take a look.

Let's get this bread

How was the test on screwn done?

@SchrodingersBox

Жыл бұрын

you mean the relative compression test I assume ? it was done using amperage measurement from the starter during cranking and just projecting it to the screen using picoscope software.

@eddiecortez8320

Жыл бұрын

Opps screen

would it be carbon monoxide instead of carbon dioxide?

@scottwoodbury5777

Жыл бұрын

Not sure, but from my school days I remember that a 100% efficient gasoline engine will result in carbon dioxide and water. Of course, nothing is 100%, so you have all the other unwanted byproducts such as carbon monoxide, oxides of nitrogen and other undesirables.

@SchrodingersBox

Жыл бұрын

While there would be carbon monoxide too, there is also carbon dioxide which the fluid specifically reacts to. In fact you can turn it yellow using your own breath.

@scottlombardi8315

Жыл бұрын

@@SchrodingersBox Thanks for the clarification! Great answer!

@SchrodingersBox

Жыл бұрын

Hahaha wasn’t sure how nerdy to get but I can give an even greater answer since this is in my science wheelhouse. While the fluid is propriety, I can tell just by looking at it that it is bromophenol. We use this in the lab all time as a CO2 and pH test. When CO2 enters the liquid it makes it acidic and the blue turns to yellow giving an indication of this. In a lab you actually use a device called a spectrophotometer that measure how “yellow” the fluid is as it turns more yellow as the pH becomes more acidic. This allows experiments to see how pH changes over time while constantly measuring it.

@scottlombardi8315

Жыл бұрын

@@SchrodingersBox Thanks for the detailed explanation. This is how we all learn.

People always try to troll ! F them

UCL :Unintended Cylinder Leak

combustion loss in one or more cylinders

@SchrodingersBox

Жыл бұрын

Yes Howard but again- if there is compression loss, why does the compression test not show it?

@DependableAutoTruck

Жыл бұрын

@@SchrodingersBox i think like you said piston comes up fast water can't flow through the small passage as fast as air kinda blocks the small hole. Thats my best guess

@DependableAutoTruck

Жыл бұрын

@@SchrodingersBox also I bet if we had a really sensitive gauge on compression tester would show a lot

@SchrodingersBox

Жыл бұрын

I agree. There is probably a very slight difference that isn’t noticeable here.

@DependableAutoTruck

Жыл бұрын

@@SchrodingersBox it would be interesting to see 1 if you connected a regulated air supply and check gauges. and also how much air would bubble out of the radiator when you start the engine vs the amount that came out with the leak down.

Matt another easy test is to use a pressure pulse sensor on the radiator filler cap. Demonstrated very well in this short video. kzread.info/dash/bejne/rGF2zrJ7eZa4mdI.html

😋

Hi Matt One of you is enough!!! just kidding!!!!!

Your tool is so small.

@SchrodingersBox

Жыл бұрын

It’s how you use it!!

@thurlravenscroft2572

Жыл бұрын

@@SchrodingersBox 😂