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Old 11-23-2008, 03:41 PM   #1
Lamb155716
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Default School me on NA intake design

I am researching designing induction systems for NA engines (currently focusing on single cylinder for learning purposes)
plenum and runner tuning, restrictor effects, etc

anyone have any good articles or books to recommend?
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Old 11-23-2008, 05:50 PM   #2
Un0RiGiNaL
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the cat in the hat is a great book to read
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Old 11-23-2008, 06:16 PM   #3
Lamb155716
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thanks...your wheels look ugly btw
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Old 11-23-2008, 06:16 PM   #4
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Well, here's one actually on the subject you're looking for. A search I did on Amazon.



Smartass responses are only appropriate for stupid questions.
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Old 11-23-2008, 06:38 PM   #5
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You mean like fluid dynamics or something more specific to engines?

If you're comfortable with the physics, you'll be good on design as long as your thinking is practical.

I wouldn't mind fabricating up a new intake for our cars. I don't think the stock one isn't all that terrible though. It's just a matter of what it's tuned for and if the flow is smooth and even. I think some basic porting and polishing and adding runner extension should get a person whatever they want from the intake as far as tune goes.

You sort of have to ask yourself what's bad with it now, and how can I improve it? Is there enough of a gain available that would necessitate a whole new intake part? Can the same goals be achieved through mild and cost effective modification of the stock piece?

You can work through the entire intake system following the same ideas.
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Old 11-23-2008, 06:59 PM   #6
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Quote:
Originally Posted by Back Road Runner View Post
You mean like fluid dynamics or something more specific to engines?

If you're comfortable with the physics, you'll be good on design as long as your thinking is practical.

I wouldn't mind fabricating up a new intake for our cars. I don't think the stock one isn't all that terrible though. It's just a matter of what it's tuned for and if the flow is smooth and even. I think some basic porting and polishing and adding runner extension should get a person whatever they want from the intake as far as tune goes.

You sort of have to ask yourself what's bad with it now, and how can I improve it? Is there enough of a gain available that would necessitate a whole new intake part? Can the same goals be achieved through mild and cost effective modification of the stock piece?

You can work through the entire intake system following the same ideas.

well currently i am working on a practical variable length runner design for a single cylinder NA suzuki 450cc atv engine with a 20mm restrictor

I am hoping to extend my learnings to subie induction systems for greater efficiency, maybe do some write-ups to teach people basic manifold design points. I will also be making as much as i can using composite materials to save weight. It is way too early to tell, but it may be possible to make a simple dual-size plenum chamber for our boxers. (think vtec, but with intake plenum size tuning). but that is for way down the road.

I have not had much physics or science courses yet. I am looking for basic info regarding plenum and runner sizing and the effects of bends and shapes. also, i need info regarding restrictor choking and harmonics...possibly ram-air effects.
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Old 11-23-2008, 07:12 PM   #7
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Quote:
Originally Posted by lambdamaster View Post
thanks...your wheels look ugly btw
lolumad?
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Old 11-23-2008, 09:08 PM   #8
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Quote:
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thanks...your wheels look ugly btw
SERVED SON~!
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Old 11-23-2008, 10:33 PM   #9
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Experts on fluid flow (which I am not) are incredibly well-educated. I'm currently in my last weeks of completing a B.S. in Mech. Engineering, and trust me when I say that even designing a single cylinder intake would require a huge amount of time and assumptions about many unknown conditions. The only way to really get a good answer as to "what is a better design" is to build a prototype and flow-test it, or to model the system in a program like Fluent.

You would most certainly have mixed flow (laminar and turbulent, depending on where in the system you are), and because your flow velocities are variable - both because there is a pulse which yields harmonic effects as well as variable RPMs - it would be nearly impossible to write a set of equations to accurately solve for factors in flow without computer aid.

To give you an idea, a senior design team from my school was working with an engine company last year. It took the team of 3 senior ME students nearly 8 months to develop a system simply to measure flow in turbine intake ducts (not even to optimize it).


Like I said earlier, while I'm not an expert on fluid flow, I would be happy to casually help if you have any specific questions.... just shoot me a PM. Good luck!
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