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.

 

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

 

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

 

Critique it??
I want to make love to it

 

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)

 

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.

 

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.

 

Friends-ftjandra is one sharp cat,and If I was building a first intakeyou could do alot worse from stealing a design.(G)

 

I bet this manifold will work better than the stock one for you, but Im sure there are better ones out there.

 

So more importantly, what do the before and after dyno charts look like?

 

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..

 

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..

 

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.

 

Anybody have access to a flowbench for free/cheap?

--Ferdi

 

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.

 

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.

 

just dyno it and find out.

as dont forget the air flows in wavezzzzzzzzz

 

Not trying to shoot it down, symmetry is good if packaging allows.

 

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.