Info needed on porting details for a stock Tuned Port Intake manifold

David Doddek pantera at pobox.com
Mon Jun 30 04:26:02 GMT 1997


>I'm in the process of porting my intake manifold and was wondering if
>anyone else has done this.  
>
>So far I have about four to five hours worth of porting done on the
>first of the eight ports.  I'll try to describe what I've done so far.
>
>I've gasket matched the intake gasket area which involved grinding
>substantial material away from around the roof of the port around the
>injector boss.  There seemed to be a "lip" of some sort that I hope
>wasn't an air deflector 'cause it's gone now.  The overall port size now
>matches the gasket perfectly.
>
>The runner gasket area was really weird: Kind of shaped like a trumpet,
>so that the opening was already larger than the gasket, but necked down
>to the gasket diameter over about a radius of 2 mm.  The gasket is a
>perfect fit to the runner, which is smaller than the intake opening.  I
>have opened up the port to the diameter of the intake opening to remove
>the "trumpet" look.  Substantial material was ground out into the port
>about 3cm.  
>
>As the port proceeds towards the intake gasket area, it makes a rather
>abrupt turn to straighten and turn into the cylinder head.  I've found
>that the material in this area is a good .200" thickness, so I have
>ground out about half, about .100" to increase the inside radius of the
>turn.
>
>Lastly, I have noted that about .200" material exists in the roof of the
>port, so I have raised the roof of the port around the injector boss
>about .050 - .100 ".  I have also lowered the floor of the port at the
>runner entrance about .050" to .100" in order to again smooth the bend.  
>
>Now I DID have one incident that scared me almost ot death:  I hit a
>pore in the aluminum.  It made me think that I had perhaps ground into a
>water jacket, but as I examined it, I decided to continue grinding.
>(What the hell, I thought, I'll have to weld anyway if it's through.) 
>Luckily, I ground the pore out and it stopped.  
>
>
>Now, Has anyone attempted to port one of these things, and if so, do
>these procedures sound like the right thing to do?  I don't have access
>to a flow bench to test them, but would like feed back from experienced
>porting people.
>
>	Dan.
>
Probably would of been easier to have it Extrude Honed.  Since the intake is
hard to get inside of it is hard to port and polish.

David Doddek     pantera at pobox.com    www.pobox.com/~pantera    217-422-3722
69 EFI Fairlane, 89 T-bird SC, 74 Twin turbo NOS EFI Pantera #6825
If you are going to go fast, go real fast.




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