Intake Manifold - Explained

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[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 ".

[amr-]

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

[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.

[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.

[chezramzoid]

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

[HassanEido]

@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.

[austinthornton]

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 👍

[deependrakesavan]

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.

[johndevos]

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

[GiTaYsf]

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

[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!

[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.

[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]

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

[marsredr]

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."

[mtnhigh]

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.  

[cimpo]

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

[KillerZero]

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 am indeed learning as I make each video.

[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.