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M20 Cylinder Head Inlet Flange Drawing

To download your free copy of the BMW M20 Cylinder Head Inlet Flange Drawing in AutoCAD *.dwg format, please read and agree to the following terms and conditions:

1) I agree to satisfy myself, prior to myown investment, that the information contained within the file downloaded meets my needs and that the purveyors of this information are in no way responsible for errors or omissions.

2) I agree that I will not seek to make money or otherwise profit from the information contained within the downloaded file or the file itself.

3) I understand that the flange as cut, will not represent a "finished article" and that the ports require further finishing to match the shape and angle of the port in the cylinder head.

4) I understand that the flange represented in the drawing file is designed only for use on the M20B25 cylinder head and that it may not be suitable for use on the M20B20 or M20B23 engines.

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NB; The port descends into the head at an angle of around 32degrees. To match this angle you will need to make a template which can be attached to the engine side of the flange to mark out the port shape, and then move this template to the other side of the flange to mark out the same shape but higher up.

If the material you've had the flanges made from is 8mm thick for example, you will need to position your template 5mm further up on the NON-ENGINE side of the flange.

Having done this, break out the files and get as straight a line as you can between the two sides of the flange.

Lastly, you'll need about 1m of 1 5/8" tube with a 16swg wall. Cut this to the correct angle and weld it on. There will be some bending of the wall required to get a perfect fit but this only applies to the top of the port....if you've got your angles right.

Enjoy and feel free to e-mail any comments or suggestions to mcbain3@gmail.com