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Hi,

 

Do you mean the intake diameter in front of the butterfly?  Right at the junction between the red horn?

 

I'm happy to measure it if you need it.

 

~Jason

 

PICT0051.JPG

Edited by jsnppp

1973 2002tii (2764167), Baikal, sunroof, A/C, 5spd OD, 3.91 LSD, etc. Rebuild blog here!

In the past: Verona H&B 1973 2002tii (2762913); Malaga 1975 2002; White 1975 2002

--> Blog: Repro tii cold start relay;   --> If you need an Alpina A4 tuning manual, PM me!

 

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45mm at the throttle plate, but it necks down to 42mm at the exit where the TB mates with the manifold.

 

I can take a measure over the break and will post here - glad to help.  This sounds right.

 

~Jason

1973 2002tii (2764167), Baikal, sunroof, A/C, 5spd OD, 3.91 LSD, etc. Rebuild blog here!

In the past: Verona H&B 1973 2002tii (2762913); Malaga 1975 2002; White 1975 2002

--> Blog: Repro tii cold start relay;   --> If you need an Alpina A4 tuning manual, PM me!

 

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When I had my A4 rebuilt, the rebuilder bored the 42mm part to 45mm.

That necking should increase performance.  It certainly increases charge velocity.  I doubt it makes a whole lot of difference but you may have lost a few ponies by boring it.   I think you would have to bore the manifold too in order to avoid a pretty nasty step.

Do you have a picture straight down the stack, Bill?  I'd be curious to see how the machinist modified it all to flow smoothly.

 

Pete

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  • 4 months later...

45mm at the throttle plate, but it necks down to 42mm

I found this photo on another thread. (My apologies to the original poster, but I can't remember where I found it and who posted it.) It appears to me that the upstream end of the throttle body, where the diameter is 45 mm, is larger than the downstream intake manifold end because the trumpet has a sleeve that inserts into the throttle body. I would guess that the inside diameter of the trumpet is 42 mm and therefore as the air passes from trumpet through the throttle body the channel is 42mm throughout. Notice that there is an abrupt change from 45 to 42mm where the trumpet sleeve ends.

post-46620-0-95255200-1428093151_thumb.j

Edited by B-Merry
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  • 2 months later...

Does anyone know, or can someone make, the following measurements:

- width of A4 intake manifold (distance air travels from gasket to gasket)

- width of the A4 ITB (distance air travels from gasket to gasket)

- length of A4 trumpet (from bell to ITB, excluding sleeve insert)

- length of A4 trumpet sleeve (that slides into the ITB

I would love to get my hands on a set of these parts, but they are pretty rare.

If I can't find a set I may try to use something else, but would like to retain the same geometry as much as possible...

Thanks folks,

Jim

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