M20 manifold air flow into ports seem odd to me

[nando]

but that is definitely a B27 intake manifold.. and you're asking why it doesn't seem like a good match. ;)

[Chuckcruzin1986]

Intake issues

but that is definitely a B27 intake manifold.. and you're asking why it doesn't seem like a good match. ;)

I am learning the hard way to explain with more detail. The pictures are of an E manifold but the same thing is true of the I manifold. The air comes it at a bad angle. 90 degrees from the mounting surface and yet if you look it seems the best angle would be 30 degrees.

Chuck

After I do more work on this question, I will post what I have found and done.
Thanks

[PeaveyBassist]

I know someone who can help you with the manifold design. He is currently doing a psycho m20 build! He has a thread in the project car subforum in member rides. The thread title is "my own personal hell".

[NC325iC]

you are impervious to common sense arent you

[nando]

I am learning the hard way to explain with more detail. The pictures are of an E manifold but the same thing is true of the I manifold. The air comes it at a bad angle. 90 degrees from the mounting surface and yet if you look it seems the best angle would be 30 degrees.

Chuck

After I do more work on this question, I will post what I have found and done.
Thanks

I'm not really sure what you are talking about then. are you referencing the bend just before the injector port?

[Chuckcruzin1986]

Better explaination of flow angle of intake manifold

I'm not really sure what you are talking about then. are you referencing the bend just before the injector port?

The stock intake brings the air in at 90 degrees from the mounting surface of the head.

If you look into the port you would think the most efficient flow would be coming down at an angle.

See images :)

[nando]

i see what you're talking about now

I don't think it's quite 90 degrees, but I'll have to look at the spare manifold I have. It doesn't seem like it could be that far off, who knows what the BMW engineers were thinking and why they made it that way, but they likely had a reason.

[Chuckcruzin1986]

Design factors

i see what you're talking about now

I don't think it's quite 90 degrees, but I'll have to look at the spare manifold I have. It doesn't seem like it could be that far off, who knows what the BMW engineers were thinking and why they made it that way, but they likely had a reason.

Since there are so many factors which enter into design, cost, assembly, power, service etc. I am of the belief the manifold can be improved when we are looking for one thing ;) (Power).

We will see.

By the way, I posted another request asking for recommendations of the diameter of the runner..........ideas?
Chuck

[digger]

i see what you're talking about now

I don't think it's quite 90 degrees, but I'll have to look at the spare manifold I have. It doesn't seem like it could be that far off, who knows what the BMW engineers were thinking and why they made it that way, but they likely had a reason.

I also don't think the runners on the manifold are anywhere near 90 degrees to the head will have a look at a spare later today to confirm.

[blueapplesoda]

it would be nice to have a discussion about our manifolds, like they do over on the s30 z forums for those l24's...all those colorful CFD renders MMMMmmm