How Porsche Perfected Intake Manifolds

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Published 2018-11-18

When Porsche designs an intake manifold, they do things differently. While most car companies try to increase pressure of air entering an engine, Porsche tries to expand that air. Here's how it works.

Intake manifolds can be designed with certain length runners in order to be tuned to produce peak horsepower at a specific RPM. The idea is that when the intake valve closes, the air rushing into the engine is force to build in pressure in the intake port. This pressure wave wants to equalize, so it bounces back and forth in the intake manifold. If you time the valve openings correctly, you can have that high pressure air force its way into the engine, making more horsepower and more torque. But Porsche does something completely different, instead of increasing the pressure of the air going into the engine, they try to expand the air. The video explains why Porsche's method is so effective, and how it reduces brake specific fuel consumption (BSFC).

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All Comments (21)

@EngineeringExplained 5 years ago

Hope everyone's having a wonderful day! If you find yourself suddenly curious about intake manifolds, here are some great additional videos! How ITBs Work (Individual Throttle Bodies) - https://youtu.be/uS3yHPfT9I8 How Intake Manifold Tuning Works - https://youtu.be/FaYIHQGU00k The Basics Of Intake Manifolds - https://youtu.be/oMjAtDGdWRM How The LaFerrari Intake Manifold Works - https://youtu.be/I_bOGqeHYlM
@KnightsWithoutATable 5 years ago

It's not about the size of your whiteboard, but instead is about the content of the marks upon it.
@TheGinger1 5 years ago

Surely the size of your whiteboard is proportional to the awesomeness of your channel!
@metanumia 5 years ago

Nice, I see you increased the displacement of your whiteboard, I bet its performance is quite a bit better now!
@rochditidjani 4 years ago

I honestly thought this intake manifold expansion would bring about 2° to 3°C cooling. However your drawing on the board clearly shows a reduction of 20°C. That is simply stunning, considering the engine block is still so hot.
@buiItnotbought 5 years ago

I tried to expand mine and blew the welds on the intake
@lebaneezer1 5 years ago

Engineering is so awsome.
@Explorerman1293 5 years ago

Congrats on the new white board! I guess it only takes 2 million subscribers to upgrade lol Edited for 2mil!!
@itsalgud1459 5 years ago

It’s amazing how cars are designed and built these days! I am an old fart so I can appreciate how different they are. Thanks for a really interesting and informing video, Jason.
@MikeFyxdt 5 years ago

Thoughtfully explained. I found this very interesting, I had no idea! I am also impressed that you went over six minutes in a single take. Thanks for posting!
@davidleser7186 5 years ago

Awesome content, I like how you are going into the technical aspects of cars and their inner workings. Also the additional links you provide to such special topics, as this one, are incredibly interesting. Keep it up!!
@FlatPlaneCranky 5 years ago

Porsche engineers are some of the best in the world.
@superchargedsteve3411 5 years ago

As usual a very concise and easy to understand explanation of Porsche's technology and how it differs from traditional intakes. Your videos are a joy to watch Jason, and you have even responded to me a couple times which makes me feel all warm and fuzzy!
@37rmstrong 5 years ago

These people are brilliant! Thanks for sharing. It's amazing how much the seemingly small things make such a quantifiable difference.
@Oldbmwr100rs 4 years ago

I've worked on a lot of Porsche cars and this answered the questions I had for their strange "log" manifolds. it makes sense, cooler air is denser, also tuning, while important is not the only factor. Of all the european cars i worked on, I've found Porsche's to be very solid, reliable and easily serviced, with older mercedes not far behind.
@_PsychoFish_ 5 years ago

I just want to say that it is amazing how your style changed over the last few months! Not that you were bad before but you seem more comfortable in front of the camera! Your quality of explaining complex topics in a simple and entertaining manner is still as great as it was before, lets strive for the 3 million! ;)
@alanboyer8993 3 years ago

Can I just say, your awesome I’m digging this unbiased information based channel you got, I’m learning a lot from these videos. Next time I got some spare change I think I’m grabbing some gear. Thanks man.
@Eaveszx14 5 years ago

I'm an older guy that got out of the dealership and Automotive business in 1991 I still enjoy working on hot rods however, learning about some of this newer technology is really interesting to me and the professional way in which you conduct yourself in your Channel is easy to watch and understand I hope you go far in life doing whatever you want to do it seems you have a great start best wishes...
@sakarihaikonen 5 years ago

It's very cool what Porsche is doing. After watching all these engineering breakthroughs made by them, I no longer wonder why their cars are so damn good.
@rockybalboa3371 5 years ago

It’s amazing how much knowledge you have on cars!