Porting Technic

[Rx7man]

I invested a LOT of money into burrs.. some of the smaller ones were $12 each, but they're indispensible. I need a better drive system now though

I have a long shank 1/4 drive, 3/8th tip "tree" shaped burr that is excellent, it's a little big for transfer ports, but works very nicely on intakes and exhausts. It was essential doing the Cummins head where you gotta reach in 6"
For the next step finer, I like the ball nose 1/8th drive for contouring, usually a 1/4" is still small enough for most of the work
and for the last bit of material removal, 1/8th drive, 1/8 nose burrs, I have some tapered, oval, and straight ones, each has their own application.
Emery cloth on a split mandrel for the polishing, and for rounding the port to cylinder corners, I use about a 3/8th round stone on a 1/8th shank, does a nice job of breaking the edge without chipping the chrome

 

[mdavlee]

I like the alumni hog for lots of material removal in the 1/8" size. They last a good while as long as you don't use them to go through plating for finger or bridge ports.

 

[drf255]

I like the alumni hog for lots of material removal in the 1/8" size. They last a good while as long as you don't use them to go through plating for finger or bridge ports.

What's your tool of choice to make your initial cut through the plating for fingers and bridges?

Also, what are you using to make your split mandrels?

 

[mdavlee]

What's your tool of choice to make your initial cut through the plating for fingers and bridges?

Also, what are you using to make your split mandrels?

I use dremel cutting wheels or double cut burrs.

I have a mandrel that takes the little rolls.

 

[drf255]

Even with a double cut burr, the head wants to wander on me when cutting through plating.

Fingers look particularly tough to get right. Haven't tried any yet.

 

[Ironworker]

I just got some of these. I find you can do a lot with these. 1/8 shank

 

[Ironworker]

The round nosed 1/8" burrs are nice

Which ones are those, picture please.

 

[Ironworker]

What do you guys use for chamfering ports.

 

[Deets066]

What do you guys use for chamfering ports.

I don't have a good round stone, so I use a round double cut burr

 

[drf255]

A diamond ball works best for me.

 

[mdavlee]

Blue ceramic stone for port edges.

 

[big t double]

Was ready to flag the post. I figured you were talking about an 80's turntable and just forgot the s at the end.

Technics. 1200-mk2.

 

[Bluefish]

One of my favorite porters uses a hoof rasp quite liberally. Hope I'm not giving away any secrets...
Russ