Intake Manifold - Explained

What is an intake manifold? How do intake manifolds work? What is a performance intake manifold? This video features a Skunk2 Pro series intake manifold courtesy of Redline360.com. Intake manifolds are the connection between the throttle body and the cylinder head. They also serve as a hub for connections like the IAT sensor, the EVAP purge valve, the fuel rail, the breather hose, and a vacuum connection for power brakes.
Check out the performance intake manifold from the video here:
Skunk2 Intake Manifold: www.redline360.com/skunk2-inta...
Redline360: www.redline360.com
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[@EngineeringExplained]

Awesome, thanks for watching!

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

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@@mulatu.lejebosister1454 bruh what

[@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]

Thanks for subscribing, glad you could learn from it!

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

[@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.

[@BKofficer23]

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

[@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 ".

[@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 👍

[@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.

[@EngineeringExplained]

I'm pretty stoked about it!

[@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.

[@EngineeringExplained]

Absolutely.

[@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.

[@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.

[@giacomom1275]

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

[@EngineeringExplained]

I am indeed learning as I make each video.

[@EngineeringExplained]

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

[@EngineeringExplained]

I will eventually, yes!

[@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!

[@EngineeringExplained]

I provided a link in the description.

[@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

[@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.

[@EngineeringExplained]

I checked the Honda service manual to verify, it shows flow from intake manifold to the valve cover. (Arrow pointing from intake to valve cover).

[@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

[@herbvergara1]

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

[@HomeOfJack]

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

[@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

[@TammyMartinBLUE]

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

[@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.

[@saadaq2005]

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

[@stephen5147]

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

[@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.

[@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!

[@RidingonLAMS]

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

[@monperez7223]

Very clear explanation with clear examples

[@EngineeringExplained]

I know I've been asked many time. And yes, I hope to have a video in the coming months. My apologies for it taking so long.

[@jolladevices]

Message from the future: no problem

[@dyudsaduh083]

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

[@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.

[@meh6953]

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

[@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

[@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

[@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.

[@keitharoo1962]

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

[@Beretta96Dan]

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

[@mrmusikman8298]

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

[@natgoboom]

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

[@EngineeringExplained]

I do indeed.

[@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.

[@amistry605]

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

[@Fast_Flick]

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

[@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

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I love this channel so much man!

[@Jess_Ernst]

Excellent description! I fully understood!

[@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?

[@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

[@FastFoodHavion]

This was very informing and easy to understand

[@EngineeringExplained]

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

[@nishantpatel5532]

dude! i cant even tell you how awesome you are!!

[@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.)

[@edgarassteponavicius5620]

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

[@EngineeringExplained]

Assuming the ECU can't compensate for the additional air on it's own, then yes. But there are scenarios where no tune would be needed - especially if the ECU can properly calibrate the A/F on it's own, which I'm guessing most modern cars can do.

[@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.

[@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.

[@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.

[@THEgnarly1]

your the best at this man keep doing these vids!!!

[@EngineeringExplained]

Just for you ;)

[@wiltse0]

awesome! i'd love to see that video, tuning has always interested me.

[@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.

[@tommysmith5082]

Excellent video. Thanks.

[@thedarkknight4243]

wow wonderful information on the intake manifold, thanks a lot, I have learned a lot.

[@drekelley2352]

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

[@dezertraider]

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

[@BKofficer23]

Thanks for the explanation, it's much appreciated!

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Greatttttt videos i almost watched all of them and cleared lots of concepts god bless you....

[@user-be4ok4ir2f]

THANK YOU SO MUCH FOR THIS GREAT VIDEO 🙏

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Best channel on youtube. Hands down.

[@EngineeringExplained]

Probably won't cause much of a change if any, but theoretically it could improve it if the design is more efficient.

[@fourtyfourmag]

i love your videos man very informative

[@SideHatchStudios]

Great video! Very informative.

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Just subscribed. Love your videos! Very well explained. Keep up the excellent work!

[@EngineeringExplained]

Thanks for subscribing!

[@EngineeringExplained]

They do have small engines which run on compressed air. Requires a tank of compressed air of course. :)

[@thr0y509]

Brilliant explanation 👏

[@fastandy2807]

Amazing explanation 👌

[@jboombapbap]

Awesome vid. most like how everything explained. subscribed.

[@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.

[@hassaanmalik1999]

Amazing video it really helps thnx

[@Whatdoyouthink.687]

Very good vid, thanks for the info. Awesome.

[@donavenable]

Greatly, explained with good information..Much appreciated..!! I'm on the process of making two throttle bodies on one intake..!! What's imput on that..??

[@EngineeringExplained]

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

[@aperichmond]

Keep doing what u are doing great work

[@EngineeringExplained]

Thanks!

[@cwuzii]

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

[@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

[@GarageKing]

Great video

[@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.

[@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

[@isabelgarcia891]

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

[@gigglygully4406]

Very Well Explained

[@EngineeringExplained]

Have you tried contacting tech support regarding the part? They should be able to offers solutions as they designed it.