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Old 11-25-2009, 06:51 PM   #1
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Default Critique this Intake Manifold

A few months ago I had an intake manifold made. Rob at Flipside Customs based it on the one he's currently offering. It has a larger plenum and a custom flange to allow me to use a specific throttle body. I would like to hear some honest feedback on what others think of the manifold itself as well as the logic behind those thoughts. Thanks.
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Critique this Intake Manifold-flipside1.jpg   Critique this Intake Manifold-flipside2.jpg   Critique this Intake Manifold-flipside3.jpg   Critique this Intake Manifold-flipside4.jpg   Critique this Intake Manifold-intake-manifold-test-fit.jpg  

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Old 11-25-2009, 07:00 PM   #2
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Disclaimer: I am no expert in fluid dynamics, etc.

But, it looks like cyl#1 would be starved for air with most of it going to the cylinders furthest from the throttle body . This is just by going with how *I* imagine the air flowing. I think runner#1 is too close to the TB.

I went through the same thing while making my own manifold. That's one of the reasons I had the velocity stack protrude into the 'flow'. But, who knows, yours might be awesome while mine completely sucks...

--Ferdi
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Old 11-25-2009, 07:04 PM   #3
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It looks good, I have one of the intakes for the 1.6L still have not had the chance to fully install it nor tune it. It looks expensive though lol
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Old 11-25-2009, 07:09 PM   #4
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Critique it??
I want to make love to it
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Old 11-25-2009, 08:02 PM   #5
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I would have to agree that it has an issue withCyl.#1 not having sufficient airflow.Also the finish of the velocity stacks could be smoother.I dont have pics of mine,The v-stack is a smooth,polished transition all the way to the head.
(G)
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Old 11-25-2009, 08:03 PM   #6
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I would like to see a fluid dynamics expert on the subject because I will be starting my mani build soon. I would have to go with ftjandra on this one, from all I have read up on the subject and talked to others that make them as well.
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Old 11-25-2009, 08:04 PM   #7
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I'm curious about the transition between the plenum and the runners. It looks like there's a sharp lip that could be smoothed out.
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Old 11-25-2009, 08:16 PM   #8
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Friends-ftjandra is one sharp cat,and If I was building a first intakeyou could do alot worse from stealing a design.(G)
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Old 11-25-2009, 08:19 PM   #9
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I bet this manifold will work better than the stock one for you, but Im sure there are better ones out there.
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Old 11-25-2009, 09:44 PM   #10
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So more importantly, what do the before and after dyno charts look like?
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Old 11-25-2009, 10:17 PM   #11
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Without CFD numbers, our opinions are worth about as much as the machining debris. But IMO the runners are way too short.
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Old 11-25-2009, 10:25 PM   #12
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Quote:
Originally Posted by Savington View Post
Without CFD numbers, our opinions are worth about as much as the machining debris. But IMO the runners are way too short.
This.
But FWIW, I also think flow to #1 might be kinda odd..
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Old 11-25-2009, 10:30 PM   #13
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i'm just curious, how would an intake manifold work if its same design as a twisty exhaust? Perhaps even more it so its pointing up and its in the middle and have the throttle body up there as well?





i donno just trying to think outside the box on something new..
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Old 11-25-2009, 10:34 PM   #14
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Im fairly certain the reason behind that manifold is to have fairly equal length runners, with an intake it must have equal length runners to have equal distribution to all cylinders, while this is a good thing on the exhaust side it is a must on the intake side. also exhaust manifolds do not need a plenum, intakes do.
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Old 11-25-2009, 10:38 PM   #15
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Anybody have access to a flowbench for free/cheap?

--Ferdi
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Old 11-25-2009, 10:38 PM   #16
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Yeah, not sure you need to introduce that kind of complexity as long as the plenum is comfortably larger than the volume of a single cylinder and flows well. That's why I'd be interested in smoothing out the transition between the plenum and runners.
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Old 11-25-2009, 10:41 PM   #17
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if thats the case then why not make one with very short runners and a lot of empty space as a plenum?

again i'm not being ignorant or anything of that kind, i'm just trying to think of a way to improve the traditional way.
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Old 11-25-2009, 10:44 PM   #18
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just dyno it and find out.

as dont forget the air flows in wavezzzzzzzzz
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Old 11-25-2009, 10:44 PM   #19
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Not trying to shoot it down, symmetry is good if packaging allows.
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Old 11-25-2009, 10:52 PM   #20
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Quote:
Originally Posted by triple88a View Post
if thats the case then why not make one with very short runners and a lot of empty space as a plenum?

again i'm not being ignorant or anything of that kind, i'm just trying to think of a way to improve the traditional way.
Toyota does it on some of their corolla engines.



Edit: Looking at it, this faces the proper direction to have the flange cut off and a b6/bp flange welded on.... Only problem would be clearing the shelf/shock tower.
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