Intake Manifold - Explained

[@amr-50]

You are the best teacher ever really appreciate your efforts thanks from my deep heart

[@mulatu.lejebosister1454]

You know it 8and I was a good friend of yours but you didn't want it back in the United nations would not allow you any time in the future of Bundle of power and the future and your life will never happen 6in for a 96month or the next generation 3of 9or 6is and a new one is a great team and it has

[@topcat1399]

@@mulatu.lejebosister1454 bruh what

[@GiTaYsf]

Just awesome. You've helped me a lot with your videos. Never had I so much information about engine.

[@austinthornton4150]

When I was in middle/high school I really enjoyed cars but didn't bother learning the actual mechanical aspect of them. Now that I'm a bit older I find alot of interest into learning stuff like this. Love your videos 👍

[@cweelyram]

The Intake Manifold design doesn't only involve a larger diameter. While a larger diameter will allow more volume through, it also slows down the air speed. Slower air speed through the runners, naturally won't allow for complete cylinder filling at high rpm. The length of the runners are a major factor, these are tuned specifically to take advantage of the pulsing effect when the valves are opened and closed (i.e. harmonics). Larger volume of the plenum is a benefit as it allows for more air "available ".

[@deependrakesavan2918]

Jason, your channel is awesome! You've been a huge help throughout my entire semester. Your explanations are really easy to understand and very informative. Keep up the good work. Looking forward to learning more.

[@carolynekeeler]

Jason, I so enjoy watching your videos that I re-watch them to learn even more (today's Presidents Day 2021). You are a true talent in so very many ways!

[@mtnhigh11]

All your videos explain automotive systems very well. I may pass my exams because of you. Keep up the great work! My first subscription of all my years on youtube.

[@EngineeringExplained]

A great honor to be your first subscription, thanks for watching!

[@imronb9819]

Engineering Explained what will you or can you do to mazda cronos 626 24 valve v6 car? : ) 1993 - 94 to be more specific

[@DFSshop]

Engineering Explained, Hey EE, I enjoy your videos and regularly share them with customers so they can easily grasp certain systems. One thing though, when approaching the PCV system, you pointed at flow being from the intake manifold to the valve cover. That is false. The PCV valve on the valve cover is a one way check valve stopping pressure from entering the crankcase and only allowing flow from the engine to the intake manifold in order to burn the oil vapors. If flow were as you said it was, every boosted engine would suffer from gasket/seal failure every time it made boost (positive pressure in the crankcase would push the seals out). I've seen this happen on a 300ZX-TT where a customer didn't reinstall the PCV system and had cam and crank seals blow out on the first drive post rebuild. Keep up the good work, the Internet needs a reliable source of info, and you're it. Cheers

[@EngineeringExplained]

Torque and horsepower are directly related, so you won't simply produce one without the other. Higher HP may come from higher RPM without changing the torque, so if that was the case torque could remain the same.

[@lunadiego8894]

Im just learning the whole process and parts of cars and found your videos. I appreciate the way you explain stuff, im learning a lot from you thank you

[@montlejohnbojangles8937]

Again, thank you. You've increased my knowledge of engines and car engineering tenfold just with five minutes at a time and a simple whiteboard.

[@giacomom1275]

You can't even imagine how useful your channel is. Thank you for your explanations!!!

[@EngineeringExplained]

1) The piston pulling down on the compression stroke, as well as any vacuum remaining from the exhaust gases leaving. 2) Only 1 valve is open at a time, so the incoming air flows to the open valve, thus it is fairly even.

[@2662tbest]

I really admire your knowledge of cars and how they work. Teaching is the best way to learn some say, I was wondering if your learning about how cars work as you make each video?

[@HomeOfJack]

Finally! A video that shows you where the inlet vacuums go

[@EngineeringExplained]

I am indeed learning as I make each video.

[@KillerZero259]

i agree with some of the commenters on here. combining theoretical explanations with hands-on installations will be a sure way to win over a huge audience! great video as always man. i like how you are direct and straight to the point.

[@longboardbuilder]

Thanks for the great informative video! I may be mistaken - but I believe that runners can be tuned (like headers) so that the +/- pressure waves will be aligned nicely at a certain RPM to give a pressure slightly higher than atmospheric just as the intake valve opens, thus increasing power (albeit only for a certain part of the rev range). A video on this and the basic (or just some rule-of-thumb) calculations associated with finding optimal runner length, diameter, etc would be great! I know it was mentioned but I would also love to see video on independent throttle bodies. Keep up the awesome videos!

[@edgarassteponavicius5620]

You look like the happiest person holding that manifold! :)

[@ritchiefigueroa8153]

Dude i know so much about cars now after watching your vids. I watch each one of your vids like twice just so i can truly understand excellent job keep up the good work now i can impress my dad ( car mechanic) how much i know about cars lol

[@dyudsaduh083]

a very helpful video for newbie in cars or any vehicle...very educational

[@BKofficer23]

Thank you so much for the quick, thoughtful, and educational reply! I continue to have a greater appreciation for the internal combustion engine.

[@saadaq2005]

Watching your videos is not wasted time but learing thanks man!!

[@RidingonLAMS]

really nice work, you take the time to explain the little things most people wont.

[@EngineeringExplained]

A basic (oversimplified) rule-of-thumb is A/C over 50 mph, windows if less.

[@bennettcerf]

Sweet! Thanks for this video. I'm becoming a pilot and intake manifold is an important part of what I need to know in the plane.

[@juliuswright7410]

So glad I found this channel, you make great vids keep it up! Could you please make a vid explaining what happens when a heel toe/double clutch shift is used to switch into a lower gear

[@puttefromsweden1557]

Just want to thank you for you´r great video´s. You explain all things so that even a dude from Sweden gets it. Thank´s and don´t quit

[@monperez7223]

Very clear explanation with clear examples

[@chezramzoid812]

I'm pretty sure that air travels out of the valve covers through the pcv hose rather than in

[@averyalexander2303]

You are correct. The pressure in the intake manifold is significantly lower than the pressure in the valve cover. Air flows from high pressure (the valve cover) to low pressure (the intake manifold), not the other way around. Air flows into the valve cover from the hose that connects to the intake pipe going to the throttle body, which is at atmospheric pressure if the air filter is in decent shape. The tube going from the valve cover to the intake pipe also allows excessive blow by to escape into the intake when the engine is operating at high RPMs and high loads when the engine is producing more blow by than what can be vented through the PCV valve to prevent excessive pressure buildup in the crankcase.

[@recardothompson5960]

I was saying that too

[@bobthbldr3]

Yep! That got my attention too. Must be a slip of the tongue.

[@lachinita7399]

@@recardothompson5960 p]pp

[@ThaHives]

Best channel on youtube. Hands down.

[@KJMTurbo]

I love that you're using the standard airbox. I'm not a fan of those cheap after market air filters, they look cheap and warm up the inlet temps.

[@cimpo327]

Man, showing 2D Drawing and real life engine PLUS the extra intake manifold for visualisation is incredibly genious and helps a lot understanding it.

[@EngineeringExplained]

That's the goal! Appreciate everyone's patience, as I didn't expect to be doing anything like this for another year, but parts started coming in so I started making videos.

[@EngineeringExplained]

I'm pretty stoked about it!

[@RyanAmplification]

If I may make a suggestion, I think after you show something zoomed in, please zoom out to show where that part is in relation to everything else. I love your videos and I have learned a ton from them. You are one of the reasons I am pursuing an ME degree when I get out of the military. Thank you.

[@EngineeringExplained]

Thanks for subscribing, glad you could learn from it!

[@herbvergara1]

Thank you for the videos. You've got a gift for teaching!

[@marty9464]

Like always, an informative video, but I was a bit surprised you didn't discuss runner length and it's impact on power, since it's one variable that is a factor in performance engines.

[@VemacRD350]

Very nice presentation. I hope you and your vids encourage people to hate Hondas a little less. :D I have a 2007 Si and the Skunk2 intake manifold isn't too effective unless I run bigger cams. For me, porting the stock intake manifold is more cost effective than buying the Skunk2 (over $500). -frugal engineer

[@HungrySharkMaster]

i just came here after watching his videos in 2020 and lemme tell you, this is not the same man

[@TammyMartinBLUE]

Thank you! You're making it possible for me to enjoy my car So much more😁

[@mjakakilla]

i just want to say ur awsome dude i never knew that part was the power brakes or what the heck a manifold was i have great respect for u man u are a great help to me thanks

[@aznazguy]

I agree with some of the other comments. The PCV system flows from the valve cover to the intake manifold, opposite your explanation. The valve itself is a check valve to ensure flow only in that direction. It's the blow-by from combustion going into the crankcase that creates pressure in the oiling system, which would pressurize the valve cover since the valve train oiling system drains down into the crank case area. Those gases are drawn into the intake manifold via the PCV system an recirculated into the subsequent intake charge, as I understand it.

[@johneric3886]

That was very helpful how you had A separate intake manifold next to the 1 that was on the car. Thank you as always, You do such a clear job Explaining things with good voice projection. I consider myself to be a smart man. But I do not have the mathematical skills to be an engineer. At least not yet. Lol

[@EngineeringExplained]

Eventually, yes. I have long term goals for my channel which involve doing so - but I don't want to simply install it and call it a day. I want to show the actual impact of what is installed. I also need the time to do all this, and the beautiful northwest summer prevents me from working on my car during the weekend, when there's so much to do out here in my few months of sunshine.

[@FastFoodHavion]

This was very informing and easy to understand

[@mrmusikman8298]

Thanks for sharing you knowledge on this topic, it helped me a great deal.

[@DrViiBE]

You should do an episode on breather filters, why would some use it, pros and cons and all that good stuff you normally do in your videos

[@keshavsharma3924]

hey jason, i am big fan of your videos. I have learned a lot of things from it and it helped me lot. I really like your way of explaining things. I want u to make a video on "balancing in engines" and explain all types of unbalancing forces in engine. I wanna tell u one more thing that u r doing a great job and thanks a lot for uploading such videos.

[@stephen5147]

Agree w/ previous comments... great explanations! Thank-you very much.

[@BlanchProductions]

I would say yes, the PCV or Positive Crankcase Ventilation takes the gas from the case to the intake, an emissions control rather than just vent gas to the atmosphere, I learned this replacing the PCV system on my Saab 9-5

[@HassanEido1]

@Engineering Explained , the PCV system hose you pointed out actually sucks air from the valve cover, the valve cover casing needs to be under vacuum, this helps in ring seal. Also this is why you see oil coating the inside of your intake plenum, oil vapors from your valve cover gets sucked into your plenum to be re-consumed by the engine to some degree, for emissions purposes. Also, you said increasing the the volume of runners...Thats not quite accurate. The fact is, longer/thinner runners benefit low end torque, shorter/wider ones benefit high RPM power....Usually a stock intake will be tuned for more low end than High end, or have a variable system. The type of intake you have is a static runner size. BMW engines for example the m54 has variable runner system, controlled by the DISA valve which switches from the longer set of runners to the shorter ones as the RPMS rise. Anyway this video was two years ago, and I like you later videos so thanks for those, please keep it up.

[@BIT1FFY]

+Hassan Eido I dont think his mind was on the job. It was thinking about having fun with his nice new exhaust and induction kit he scored for doing a few of these vids

[@AmrDubai79]

EXACTLY

[@timtravasos2742]

Hassan Eido, yes. Good correction.

[@Middle-of-nowhere]

Hassan Eido I have a question Why is Oil found inside the intake manifold? Is it for catching dust or to lubircate the throttle body

[@procupine14]

Generally, the oil comes from the PCV system. It's not a perfect system in that sometimes oil vapors are pulled into the intake from the crank case via the PCV valve.

[@natgoboom]

Take your time man. We'll still be here :D

[@casperl6812]

Thanks for the explaining bud, you haven't aged a day

[@inakirodrigo6183]

Nice video and nice channel, you didnt mention the resonance efects involved in the intake manifolds an how they provide better performance at certain RPM range, but that cuold be a little hard to explain on a simple way I guess. Cheers from a mechanical engineer student.

[@Swervin309]

In the beginning of the video, I was thinking "why is he holding up half an intake manifold?" Then, he said it was for an Acura Integra which has half a motor. Makes sense now.

[@mehftv]

Haha you're funny

[@Swervin309]

mehftv I've been known to come out with a zinger or two in my time.

[@jasonbentley9968]

Swervin309 'MURICA

[@DFSshop]

Not another one who gets stiffy's for 100 year old design cross plane V8's and pushrods... You guys are quick to forget Honda's F20B making the highest HP/LT for many years, only recently being beaten by Ferrari. I guess looking at GM and Ford 350's making 350hp from a 5.7L is something to chear about... LOL! 1HP per cubic inch YEEHAW Enjoy

[@Swervin309]

"Horsepower per liter hurr durr!" That's a cool ass story, bro. Tell it again for the people in the back. By the way, when the hell has there ever been a Ford 350? Anyway, enjoy your 1/2 of a motor and having to wait for "torque".

[@EngineeringExplained]

Awesome, thanks for watching!

[@johndevos9003]

Question, you said the air flows into the PCV valve from the intake manifold, isn't it the other way?

[@marcusmorrow3900]

i was thinking the same thing.

[@drekelley2352]

Damn. U are really good at making this simple to understand. Great teacher. 👍

[@JamesTT225]

It flows from the cam cover to the manifold. When combustion products accumulate in the crank case and head due to blow-by (tiny leakage through piston rings and valve stem seals etc) this is vented through the PCV system back into the intake manifold to undergo combustion in the case of unburned hydrocarbons and conversion in the catalyst in the case of combustion products rather than venting either to the atmosphere.

[@mandomonica]

You fill a great gap which is very helpful for DIYers! Thank you so much for your videos. By the way, thinking of the cracking direction of my PCV valves, it seems like there may be an error with your fingers pointing out the direction of flow. I was thinking that the unburned gasses in the CC get directed back through the intake for burning.

[@EngineeringExplained]

Straight from the plenum to the cylinder head, but there is certainly a curve for the quick 90 degree transition. Space is likely the reason it's designed as is.

[@marsredr100]

PCV from crankcase to intake...not the other way around. "The blowby vapors that end up in an engine's crankcase contain moisture as well as combustion byproducts and unburned fuel vapors. The crankcase is sealed to prevent the escape of these gases into the atmosphere, but the vapors must be removed to prevent oil contamination that leads to sludge formation. The PCV system siphons these vapors from the crankcase and routes them into the intake manifold so they can be reburned in the engine."

[@EngineeringExplained]

I provided a link in the description.

[@cwuzii]

Loving the use of the word "manifold" this time :D

[@Jess_Ernst]

Excellent description! I fully understood!

[@Fast_Flick]

Thanks dude. It explained a lots of things to me.

[@keitharoo1962]

I love these videos. I really learn a lot. Thanks!

[@EngineeringExplained]

I thought so too but the Honda service manual showed airflow the other direction. I'll have to look back into it.

[@alexesparza5384]

I love this channel so much man!

[@EngineeringExplained]

I thought the same though the service manual showed the opposite, perhaps it was simply an illustration "typo."

[@EngineeringExplained]

Absolutely.

[@meh6953]

Thank you for the informative video. This helped me understand my engine much better.

[@rewindoflow]

Essentially you use the natural frequency of the air in the intake runners to cause a pressure wave at the intake valve as it opens. It's actually possible to get higher than 100% VE using this method. Of course, for any fixed runner length you'll have a set frequency so works best at a set RPM, hence variable length runners.

[@amistry605]

Wow dude u explain stuff soooo clear it's amazing! :)

[@Beretta96Dan]

Good job! You made it very clear about the intake. Thanks!

[@EngineeringExplained]

It's very math intensive, yes, I'm won't sugar coat it. It's a ton of math, and plenty of theoretical math without actually using numbers, very logic oriented. I have a write up on my website regarding this subject. Go to my channel page, and the "about" tab. Then click on "Automotive Careers" for a link with some tips regarding this subject. Enough effort and you can get through it, best of luck!

[@therealracer135]

Some PCV systems do actually supply air in through the top cover/s, but usually they draw the air in from the intake hose/air box/somewhere before the throttle body/s. And then they have another breather hose running from the crankcase to an NRV mounted on the intake manifold, after the throttle body.

[@EngineeringExplained]

I do indeed.

[@schweetfightachamplu]

Im waiting for an ITB video. Hoping to see the differences in design for an ITB than an intake manifolds

[@garretts91]

PCV valves work off intake vacuum vs crankcase vacuum. The pcv only works at idle. That is when the vacuum is lower in the intake than it is in the crankcase. That difference pushes the ball valve on the pcv open and draws the blow by gas out of the crankcase and into the intake to be re-burnt. When not at idle the vacuum pressures are the opposite. When an engine is at anything but idle the intake vacuum can be higher than the crankcase. That would send the blow by right back in the crankcase.

[@Zchef85]

You should do a dyno run before you install all of your parts, and then after. That way people can find out realistic gains available from bolt ons.

[@TomCooper-w1v]

THANK YOU SO MUCH FOR THIS GREAT VIDEO 🙏

[@nicoxis]

It would be a good idea to go measure stock engine to get a base reading. I'd love to see what each upgrade does, if you can do a trade with a dyno shop to document the process that'd be kick-ass!

[@dezertraider]

Super great job,Wish I had a teacher like you in HS,,Thank you,Fantastic.

[@ChEeCo116]

I must say, you explain everything in great detail. I actually can picture it in my mind. Keep out the great work. You have one more subscriber now.

[@Priotech]

That is a good point to make, simply letting more air in won't change your horsepower too much without the cams actually letting more air into the chamber or the ECU knowing to inject more fuel (although most cars can adjust fuel mix on the fly from O2 sensor feedback my race car uses fixed map injection, which means it runs richer than a overjetted carby but it has trumpets and straight pipes so...). Same for most engine mods, if you don't tune it to use the new part then its a bit of a waste.

[@krismichalsky]

I'd say that the air is drawn thru the air intake system instead of saying the air just goes thru it. Engine's are merely air-pumps that pull air in and then push the air out. Sometimes more plenum volume is not always a good thing and can actually hurt performance due to the fact that you have not added any more fuel to add to the extra air that is being drawn in. No more fuel + extra air will equal a leaner condition than just using the stock intake manifold. In order to fully take advantage of a performance intake system would be to have the car re-tuned to accomodate for the additional air. Cheers! EDIT: Btw, I have that exact cross bar on my CRX. Oh and I'm running an S2 IM and S2 TB.

[@EngineeringExplained]

I've often heard of this being done, though I haven't seen any data to see if it's worthwhile or not.

[@kllgrogto5838]

If more airflow is better why car manufacturers don't make stock intake manifolds with more airflow to begin with?

[@averyalexander2303]

@@kllgrogto5838 The vast majority of vehicles are built to suit the average person's needs, not to be a fire breathing monster. Cost, noise, smoothness, fuel economy, emissions, packaging, and low end torque among other concerns keep drag racing style components from being used on grocery getters. There are always trade offs in engineering. Improving one of these factors usually makes others worse. Sure an intake manifold with huge runners may make more top end power, but to car manufacturers the sacrifices in other areas like the ones mentioned above simply aren't worth it. The average person doesn't want a loud, rough running vehicle that gets crappy gas mileage and has no power at lower RPMs for the sake of a few more horsepower at redline.

[@UEGUnequaled]

That was the same question on my mind. You keep showing parts for Integras. I'm guessing that you will do some heavy dyno runs to show what each part can do, can't wait!

[@elcano9]

Runner length plays a VERY important flow factor on intake manifolds. The skunk 2 one works better on N/A cars, while the edelbrock one tends to give better results on forced induction. They only have different runner lengths and shape. Dunno exactly why it works like that but that's what the dyno always shows between the 2. Could be something affecting velocity vs volume on both... Could be wrong, but that's just what I've experienced with these IM's... Very good video BTW

[@thr0y509]

Brilliant explanation 👏

[@EngineeringExplained]

Because the current design may be optimal for the current power, but a larger design may be beneficial to a car which makes more power. (If it were turbo'd, new valvetrain, etc.)

[@EngineeringExplained]

Not sure what you mean by types of air intakes. If you mean brands, there are quite a few. Unfortunately I don't have the time to help with projects on a case by case basis, too many people. Good luck!

[@aperichmond]

Keep doing what u are doing great work

[@EngineeringExplained]

Thanks!

[@isabelgarcia891]

Great thank you so much for the explanation please make more videos you are great!

[@TwisNinja]

do a vid on differences of intake manifolds (IE) plenum sizes, runner lengths and sizes and the effects on modified and stock engines

[@EngineeringExplained]

Interesting, for the various Integras each of the Skunk2 manifolds are under $300.

[@EngineeringExplained]

Haha I'm surprised you think so. I've used some de-greaser before but well over a year ago. It just stays relatively clean on its own.