Machines | Intake Manifold - Explained

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1. 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.
2. There's a new system I saw the other day called "stack injection" from what I can tell it just looks like a redesigned carburetor. Could you explain how this differs from a traditional carburetor and modern fuel injection?
3. You got the PCV thing wrong...
4. I have a lancer wagon. The intake manifold looks new for such an old car. or maybe the position it's in doesn't get dirty? the metal looks new. I bought it used. car works great
5. Can you upload video explaining variable length intake manifold?
6. a question, i am building an intake manifold for a single carb on a V twin motorcycle(was dual carb), now i hear allot about, if the length of the pipes to each cilinder is not identical, that one will run richer then the other. the bike i build it for is an xv750 1982. Is this true or is it a myth since there is a vacum in the manifold while it runs.
   
   For example the manifold you have also reaches the 1st cilinder first since the air needs to pass there first or that does not matter?
7. Does the intake manifold connect with the exhaust header?
8. I might not be thinking straight but is/would it be possible to install an aftermarket exhaust header, intake header and catback exhaust at the same time?
9. is it possible to have open headers and maniford does it make it louder tho?
10. Please do a open intake throttle body manifold. Do an explain on those
11. can you explain individual throttle bodies?!?
12. the part where you mentioned the PCV, I think the direction of the gases should be from the crankcase to the intake manifold, isn't it? , but you said the opposite !!!
13. Just awesome. You've helped me a lot with your videos. Never had I so much information about engine.
14. @engineeringexplained
    Why require a plenum at all, why not run the runners straight from your throttle body to your valves and thus allow a more direct route with less disturbance to the air flow?
15. Facebook
    Engineering Explained
    Chris Ainge
    Hi Jason,
    
    I've searched High and Low through piles of duscussion boards, videos, and academic research to find a clear and/or detailed explanation of the mechanical theory and/or solution to the what I describe below. To date, I have had no success except discovering that there is a phenomenon that engineers DO address during design stages, but that the concept is largely not understood and frustrates performance enthusiasts, because theoretical solutions aren't available.
    
    Here's the issue: pertains to the intake sections of naturally asperated cars. More specifically tube design and the function/value of hemoltz resonators.
    
    You have a video discussing intake manifold design that explores runner length and the timing of harmonic waves. What is missing from the discussion is what happens when the throttle body butterfly opens and those waves exit the plenum towards the air filter and begin to compete with the incoming air.
    
    From what little i formation I can find, it appears that Hemoltz resonating chambers are placed to give the pressure waves somewhere to go, allowing intake air to maintain velocity. However, like I said, information is scarce and this could be entirely wrong.
    
    What I can say is that in my own vehicle (G35 Coupe), replacing only the intake section that has the resonators with a non-resonated tube has negatively effected throttle response, acceleration, etc. It feels as though it's running richer, even after re-programming the ECU. Either way, it's not desireable, and I know many others run i to this issue after installing CAIs that remove the resonators.
    
    So I guess the question is this...How does intake tuning apply beyond the throttlebody? If pressure waves are a problem, what are the solutions? If a Hemoltz resonator is the fix, how do we calculate it's optimal distance from the throttlebody? Do these concepts become irrelevant once you go FI? Etc.
    
    Any help would be great. Most of your audience would likely enjoy a video exploring this.
    
    Regards,
    
    Chris
    Just now
16. I am curious about the IAT sensor. You stated that when the air is warmer, less fuel is injected and when the air is colder and denser then more fuel is added. But I always thought that when the air intake was colder it meant that gas could burn more fully and efficiently thus causing the engine computer system to send less fuel as it burned better; and therefore sending more fuel for the warmer air to improve combustion (hence why cold air intakes are a big sell as they improve efficiency). I could be wrong so please let me know. Love the videos!
17. feel like this is a nooby question but why would you want air in the valve cover?
18. @Engineering Explained. Can you please explain what 'Helmholtz Resonance' is and how it's related to induction?
19. I love your vids - but Aha! I spotted a mistake - at 4:24, you've got the direction of the airflow backwards.
    
    Positive crankcase ventilation involves recycling these gases through a valve to the intake manifold, where they're pumped back into the cylinders for another shot at combustion.
    
    Still, good work! You're entitled to an occasional error...
20. So you're telling me the engine crankcase has a higher vacuum than the intake manifold??