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12-26-2008 | #1 |
Join Date: Nov 2007
Location: Squires (near Ava MO in the Mark Twain N'tl Forest) - Missouri
Posts: 6,493
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Ball milling reamer??
OK, you machinists out there...Where would be a good starting place to start looking for a ball shaped milling reamer that is either chased or pulled thru a curved (i.e. intake plenum and IH) (aluminum) runner? Aside from a drill press and assorted air-driven tools, I don't have anything in the way of machining tooling. And, wanting to open up the plenum runners, I'm looking for a tool that a lay person could push or pull thru the runners that would open up the 33mm runners to a 36mm ID, perhaps in stages, if necessary. Sound crazy?
I've done more than a "little" time on a die grinder in my dayz, but looking at the LT5 runners makes me think there must be a better way than a TC ball bit and air-driven die grinder...NO? I'm thinking of a TC ball cutter that can be attached to a flexible joint so the tool will (more or less) faithfully follow the existing centerline of the runner while opening it up. Am I making sense, or am I doomed to hours with a grinder? Also, where would one find a 36mm ball gauge? TIA, P. |
12-26-2008 | #2 |
Join Date: Nov 2006
Location: dayton,ohio
Posts: 425
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Re: Ball milling reamer??
Did it the old die grinder way here but salemball.com I think was were I got chrome ones for not much.
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[FONT=Comic Sans MS][COLOR=red]"I wanna go fast!!"[/COLOR][/FONT] [FONT=Comic Sans MS][COLOR=#ff0000]-- Ricky Bobby[/COLOR][/FONT] |
12-26-2008 | #3 |
Join Date: Feb 2006
Location: Iowa aka "one big cornfield"
Posts: 341
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Re: Ball milling reamer??
You might want to look into extrude honing.
http://www.gethoned.com/process.html |
12-26-2008 | #4 | |
Join Date: Aug 2006
Location: Edmonton, Alberta or Phoenix, Arizona
Posts: 2,741
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Re: Ball milling reamer??
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There are no limit's mans ingenuity, just as mans ingenuity will never conquer the forces & behavior of this planet...Smokey Y. |
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12-26-2008 | #5 |
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Posts: n/a
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Re: Ball milling reamer??
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12-26-2008 | #6 |
Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,708
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Re: Ball milling reamer??
Sorry Paul! I used a die grinder from Powerhouse
http://www.compperformancegroupstore...ory_Code=Burrs I used the double fluted bits that don't gouge as much. More control. Lgaff is still using one of my bits for doing the plenums he's porting. Well worth the money, IMO. Go ahead. Pull out the credit card. Resistance is futile |
12-28-2008 | #7 | |
Join Date: Feb 2006
Location: Iowa aka "one big cornfield"
Posts: 341
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Re: Ball milling reamer??
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12-28-2008 | #8 |
Join Date: Sep 2005
Location: Washington
Posts: 955
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Re: Ball milling reamer??
I think it needs to be ground out by hand, then if you have the money to spend.... ex honing would be icing on the cake.
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12-28-2008 | #9 | |
Join Date: Aug 2006
Location: Edmonton, Alberta or Phoenix, Arizona
Posts: 2,741
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Re: Ball milling reamer??
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1. Average velocity; 2. Individual instantaneous velocities; 3. Shape/design (maximize a homogenous velocity profile over the ENTIRE port & at the same time promote efficient flow); 4. Rate of velocity change; & last 5. Airflow; If a person follows these five variables you'll soon find out the most important rules of designing an induction system are: Velocity, Velocity, Shape, Velocity &, finally, Airflow. I try to keep my engine building arm out of this forum, for the most part, but i hate seeing people going down the wrong road, so i apologize for partially stealing this thread. it wasn't intended. i could have jumped in many times in the past but i just let it go...can't educate everybody. i still don't know why some people think they can port out of the blue just by picking up a die-grinder? i call them carbide cowboys. you know what they say...a little bit of knowledge is dangerous...so true. one last thing...i PORT, not polish! i make the intake tract as rough as possible, the ONLY time i will lightly polish is on the exhaust port side & the only reason for that is so the carbon will have a harder time sticking to the port walls & building up over time on a street driven engine. absolutly nothing to do with so called flow. i've said enough
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There are no limit's mans ingenuity, just as mans ingenuity will never conquer the forces & behavior of this planet...Smokey Y. |
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12-28-2008 | #10 | |
Join Date: Aug 2005
Location: Fishers, IN
Posts: 815
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Re: Ball milling reamer??
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According to this expert, The worst spots on the LT5 induction tract are the head-to-housing interface, and the too large bowl areas beneath the valves. The head-to-housing area is troublesome in that to make the air follow the awkward turn, the cross-section area of the port has to be slightly larger than optimal. I will say, overall, these heads will still be smaller & faster than current thinking in LT5 port work. Cant wait to get them back! Todd |
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