Head Porting Bits - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 13 (permalink) Old 11-30-2010, 10:02 PM Thread Starter
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Head Porting Bits

I was unsure where to put this so i figured this forum would give me the most traffic. What type of bit do you experienced head porters use? Cast iron, i searched and came up with a double-cut carbide bit.. Local shop had some for sale about $30 a piece, and they work surprisingly well for one head's exhaust ports and one intake port, then started dulling. I regulated it down to 20psi where it stalled the grinder, then slowly up to 50psi. A problem i am having is the bit held at the slightest wrong angle wants to "hop" up and down on the cast iron.. I can turn the bit at a different angle of attack and get it to stop, but it has quickly led to the demise of one $30 bit and i'm not even halfway done one head. Thoughts?

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post #2 of 13 (permalink) Old 11-30-2010, 10:05 PM
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Re: Head Porting Bits

I have never even come remotely close to doing my own heads but the video I saw of it years ago I swore was using a stone of some sort. That may have been smoothing tooling marks though.
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post #3 of 13 (permalink) Old 11-30-2010, 11:39 PM
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Re: Head Porting Bits

To reduce the hop you need to slow down your grinder, or try holding at different angles.

I have always used Mac carbide burs for all my work. The seem to hold their edge pretty well, and have a full warranty on them - if they ever dull they will just give you a new one for no cost.

After you have the desired shape you need to switch to cartridge rolls, and then to cross buffs for that final finish. Mac used to sell a very complete kit, but now there are very few left. I have tried the Mr.Gasket set, which was about the same quality, but had very few rolls included in the kit.
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post #4 of 13 (permalink) Old 12-01-2010, 01:34 AM
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Re: Head Porting Bits

1/2" oval single cut carbide burr



This is my most commonly used carbide, I also use a 3/8" for tight clearance areas, and a 3/8" "Flame" style for peaking guides.

You need to move the burr horizontally back and forth across the surface you are cutting to keep it cutting smoothly and to avoid creating divots and steps in the metal.

NEW CARBIDE ROTARY FILE/BURR SE-5 1/2" X 7/8" 1718 - eBay (item 380209003373 end time Dec-18-10 11:06:35 PST)

NEW CARBIDE SE-3 **3/8" X 5/8" ROTARY FILE/BURR 1094 - eBay (item 380278960303 end time Dec-13-10 03:47:36 PST)

I have actually used a couple of this ebay seller's carbides and they work really well for the $$. I usually get mine from Cylinder Head Abrasives and have them put on a 3" long arbor so I can cut them to size for getting into longer ports. For the PSD I actually have a specific one with a 6" arbor for getting back into the pinch point in the intake port.

Don't let them bounce, you'll kill them fast that way. Start slow and work up the speed as you learn to control movement and make it work the metal the way you want it to.

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post #5 of 13 (permalink) Old 12-01-2010, 02:14 AM Thread Starter
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Re: Head Porting Bits

Yes, thank you both for the info. Single cut huh? I was told use the double cut. I regulated the pressure down so low that with a little bit of pressure (just to keep the bit on the surface) it kept stalling. Maybe less pressure, let the teeth do the work . I'll try some new methods. So far the work "looks" good and i guess it will only get better with experience. Not trying to set any records here with head flow.

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post #6 of 13 (permalink) Old 12-01-2010, 02:24 AM
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Re: Head Porting Bits

I use an electric grinder, there's no stalling out.... if you mess up and it grabs you better get out of the way as it's going to start helicoptering.

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post #7 of 13 (permalink) Old 12-01-2010, 02:31 AM Thread Starter
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Re: Head Porting Bits

oh my, more stuff to buy.. What do you use?

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post #8 of 13 (permalink) Old 12-01-2010, 02:35 AM
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Re: Head Porting Bits

Quote:
Originally Posted by Machinist View Post
I use an electric grinder, there's no stalling out.... if you mess up and it grabs you better get out of the way as it's going to start helicoptering.
I like my air one better then the electric. Its smaller easier to maneuver in tight places. I use adjustable ones from Snap On and like them. They have decent power and dont stall down as quickly as cheaper ones do.


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post #9 of 13 (permalink) Old 12-01-2010, 03:27 AM
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Re: Head Porting Bits

Quote:
Originally Posted by PowerstrokeJunkie View Post
oh my, more stuff to buy.. What do you use?
Currently a 5amp dw888 Dewalt, I have used Dumoore and Makita grinders in the past

Quote:
Originally Posted by dieselman47 View Post
I like my air one better then the electric. Its smaller easier to maneuver in tight places. I use adjustable ones from Snap On and like them. They have decent power and dont stall down as quickly as cheaper ones do.
The electric is great for hogging out lots of metal, I use Sioux and Snap-on air grinders for fine shaping and finish work.

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post #10 of 13 (permalink) Old 12-01-2010, 03:29 AM
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Re: Head Porting Bits

I put a router speed control with a pedal on my electric die grinder when I did heads.

Matt Robinson
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If you have nozzles that were Extrude honed over and over and over again. It will look like a porn stars ass.hole where the pintle is supposed to seal.
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