Cylinder head conversion to MFI injectors

[HKZ Bob]

Hi Forum,

I have a set of 911T Carb Cylinder head which I would like to convert to MFI Heads.

Is the deck height the same for the intake ports on both types.

What is the angle of the injectors to the cylinder head?

BR
Bob

[Flat6pac]

The flat spot where the injector taps is there and the angle has to be of the flat.
The E heads and the T heads are the same casting number so deck shouldnt be a problem.
Bruce

[tom1394racing]

Hey Bob

This should do it for you....30 deg....Engineers like round numbers.
The rest of the casting is the same carb vs MFI.

PM me for more detail if you need it.

[HKZ Bob]

Thank you for your help.

I am going to build a carrier first to fixate the heads properly on the stand drill.

I keep you un the loop about the progress.

Tom can you check these two other values for me.

See photo. Thank you.

Greetings to your wife, she smiles from the side were you are occupying here kitchen, nice smart phone app.


BR
Bob

[HKZ Bob]

Here how I started.

FYI.
S Cylinder Head have a 35mm exhaust diameter the intake is 38mm
T Cylinder Head have a 33mm exhaust diameter the intake is 32mm

So now back to my project.



Control you angle of 150 degrees. I made myself a gage and make sure the drill and gage lines are running parallel.




On this picture I took the machine surface of the intake port as my reference.
I bolted the 90 deg. reference angle to it and controlled the parallelity of the drill to the ref.




Once I have the correct drill I will center the o-ring groove. I will take a well dot drill. This is a drill that removes weld sports. See my drill in the machine.




I appreciate if the forum can also bring some good advices to this project become successful.

I am still looking for the O-ring plane dimension and a conformation of the MFI fuel injection thread type.

Thank you
Bob

[tom1394racing]

Here you go Bob....



Thread min OD for injector



14mm / 8 thread pitches= 1.75mm/pitch

[HKZ Bob]

Thank you Tom

I checked the slope as well.
My gage tells me the slope is 1.5


Metrisches ISO Feingewinde DIN 13-1
Gewinde Durchmesser M 12
Steigung mm 1.5

[HKZ Bob]

Hi I started to drill a 5mm alignment hole into the cylinder head.
Then I used this milling tool to prepare the surface for the injector seal. Yes is looks different to the picture above but I needed the surface for the sealing area



After the milling it looked so.




The last operation is the tapping. It is M12 x1.5 mm slope.




but to be ownest I am not happy to reproduce this 6 times. So I am looking for some carriers to make the others easier.

Regards
Bob