Who is using the 987 MAF Holder / Tube?

[blue62]

Originally Posted by Robert986

Are you sure? As for now I´m not convinced, but open for any thoughts :-)

I have been thinking and reading.. and this is my guess right now:

1) The plastic black matrix serves as air-straightener, like a honeycomb-mesh.
2) The fine metal screen after the black matrix is a extra protection for debris that might have got past the air filter, protecting the MAF and engine.

Thus removing the metal screen would give less air flow resistance but less protection of MAF/Engine. I cannot see how the metal screen would smooth out air pulses, but what do I know?

I have seen others that replace the plastic and metal screen with a honeycomb with far less area, thus giving more flow. This should be a good thing in my book.

EDIT: @Maytag, please let me know if I´m destroying your original thread, that's not my intention.

If the mesh is just before the MAF sensor it is there for the purpose I stated. To smooth out air pulses.
I got the information from an article I read on MAF sensors. The article was by Bosch. They developed the first MAF sensors and also the first O2 sensors. So I tend to go with their information on those two sensors

[blue62]

Maytag I think you started this thread. I don't mean to Hijack it.
Robert986.
Go to Wikipedia. Type in Mass Flow Sensor. The article will explain how the various types of MAF sensors work and what they really measure. An indirect measurement of Mass flow. not volume.
Read down to the cold wire type of sensor it talks about the mesh screen and its function. Hope this helps.

[Robert986]

Originally Posted by blue62

Maytag I think you started this thread. I don't mean to Hijack it.
Robert986.
Go to Wikipedia. Type in Mass Flow Sensor. The article will explain how the various types of MAF sensors work and what they really measure. An indirect measurement of Mass flow. not volume.
Read down to the cold wire type of sensor it talks about the mesh screen and its function. Hope this helps.

I did, "The mesh on the MAF is used to smooth out airflow to ensure the sensors have the best chance of a steady reading." No mentioning of pulses, however smoothing out. To my logic this must refer to the black matrix doing the "air straightning".

My idea is thus to remove the metal mesh but keep the plastic matrix, or rather change the matrix to a honeycomb doing the same work but less restrictive.

[Robert986]

Originally Posted by blue62

If the mesh is just before the MAF sensor it is there for the purpose I stated. To smooth out air pulses.
I got the information from an article I read on MAF sensors. The article was by Bosch. They developed the first MAF sensors and also the first O2 sensors. So I tend to go with their information on those two sensors

I do appreciate your input, however I´m still not convinced. First of all, there are two parts, as I call them: the matrix and the mesh. So talking about "the mesh" without determining wich of the two doesn´t make it clearer.

If you talk about the black plastic matrix as "the mesh", then I kind of agree, this is there to smooth out, but not pulses, rather to straighten out a turbulent flow to make it more consistent for the actual sensor. I cannot see how the metal wire mesh would improve the smoothness after the air straigthener. If anything it might induce small vortexes by the vortex shedding effect.

I would love to be wrong, but I still believe that I´m correct. :-) Would you be able to find that Bosch-article maybe?