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porting tools........

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baldwin racing
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PostPosted: Thu Oct 10, 2013 3:11 am    Post subject: porting tools........ Reply to specific post Reply with quote

What do you use for porting heads, and so on? I just like to see what other people are using.....figured it be a nice discussion.....I have the foredom heavy duty flex shaft txh-440 kit. the kit includes tx motor, hd 44 hand piece, cast foot pedal to have more control of tool and 10 piece bit set.... I also have a napa 90 degree air pencil grinder kit comes in a case with some bits and a in line oiler, I mainly use it for transfer ports on 2 stroke atv cylinders. but works great for hard to reach in corner ares as well...what do you use? I would like to see well known motor builder chime in if they would as well....
kelly
 
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BushogPapa
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PostPosted: Thu Oct 10, 2013 5:23 am    Post subject: Re: porting tools........ Reply to specific post Reply with quote


Various sizes and shapes of Carbide rotary cutters get the major work done.
I use the abrasive rolls, to clean up the rest.
You can use longer arbors to reach farther with the abrasive rolls.
A good drill will get it done, or you can use an air-powered Die-Grinder (or your flex-drive)..
A GOOD performance Valve job will help as much as anything..after the porting and polishing is done)..
More exotic ways are sometimes used, like an abrasive is pumped through the ports (extruded), to smooth and enlarge the passages, etc..
Ron..
 
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BushogPapa
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PostPosted: Thu Oct 10, 2013 5:27 am    Post subject: Re: porting tools........ Reply to specific post Reply with quote


Just remember that "Bigger" is not necessarily "Better"..!
You need to be thinking "Air-Flow", in an Aerodynamic sense..
Study where high-performance heads are changed for performance.. Go to some Speed Shops, or "Head Service Shops" and ask to see some examples..

Ron..
 
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baldwin racing
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PostPosted: Thu Oct 10, 2013 7:15 am    Post subject: Re: porting tools........ Reply to specific post Reply with quote

I do port now. ben in the drag racing atvs for years build motors and so on.....just wondered what everyone uses for tooling....I know bits and polishing.....learning never ends....I always messing with stuff and learning new ideas...
kelly
 
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MLPANKEY
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PostPosted: Thu Oct 10, 2013 12:47 pm    Post subject: Re: porting tools........ Reply to specific post Reply with quote

Plunge cut capable end mill. Then cartridge rolls
 
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foghorn
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PostPosted: Thu Oct 10, 2013 2:43 pm    Post subject: Re: porting tools........ Reply to specific post Reply with quote

mlpankey wrote:
(quoted from post at 21:47:44 10/10/13) Plunge cut capable end mill. Then cartridge rolls




What's a cartridge roll?

How can a end mill make a port flow?
 
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joe 427.,.
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PostPosted: Thu Oct 10, 2013 4:37 pm    Post subject: Re: porting tools........ Reply to specific post Reply with quote

Standard abraisive makes a good product.
 
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Cody
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PostPosted: Thu Oct 10, 2013 4:49 pm    Post subject: Re: porting tools........ Reply to specific post Reply with quote

cylinder head abrasives. www.ruffstuff.com. Get you a few long arbor rocks, some sand rolls & a good long arbor carbide burr. I also recommend an electric die grinder, preferably a Suhner brand w/ variable speed.
 
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VicS
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PostPosted: Thu Oct 10, 2013 4:53 pm    Post subject: Re: porting tools........ Reply to specific post Reply with quote

I hate to admit it but you are right, to a extent. The guy I go to (Jim Harrison) has a set of NHRA legal Chevy 2 humper cast iron heads that flow 100% more than stock. To be legal the ports have to be the same sq in. as stock. They also have one of 5 426 Dodge Challengers.(2012) I have looked at the latest Chrysler porting job. pretty neat. I know I am off subject. Vic
 
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MLPANKEY
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PostPosted: Thu Oct 10, 2013 5:12 pm    Post subject: Re: porting tools........ Reply to specific post Reply with quote

FPM x foot squared = CFM
 
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showcrop
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PostPosted: Thu Oct 10, 2013 6:44 pm    Post subject: Re: porting tools........ Reply to specific post Reply with quote


When I was probably fourteen I used an electric drill with a stone in it to polish ports on my dad's snowmobile.
 
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MLPANKEY
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PostPosted: Fri Oct 11, 2013 3:37 am    Post subject: Re: porting tools........ Reply to specific post Reply with quote

Fogorn thats a good south alabama name . Lim has a good tn mountain name and is known for his math skills in figuring 5ths quarts pints and gallons . Lim decides he wants to hot rod a tractor he has been reading the hotrod magazines while in the outhouse . He remembers the test depression for a flow bench is 28 inches of water. He gets him some wire and makes a crude go no go gauge and realises the tractors port is smaller than the valve size of 1.5 inches . He remebers a neighbor saying he has a 1.5 inch drill bit so its lunch time. Lim goes into kitchen and while eating a piece of chocalate pie he starts scratching out some figures on a note pad . He takes the radius of 1.5 being .750 times it by itself again and gets .5625 times that by pie 3.14 while wiping the chocalte pie from his lips and gets 1.766 . Lim then takes the square root of 28 inches of water and gets 5.291 takes that times 4005 and gets a velocity of 21190.45. he takes his 1.766 and divides it by 144 for a square feet of .0122. he times it by the velocity of 21190.45 and gets 258.523 cfm . So he says hmmm if i get my port sixe to my valve size i can have a maximum flow of 258 cfm . He then goes to neighbor and ask to borrow drill bit the neighbor say shure but tells him its dull. Lim knows he can sharpen it on a bench grinder and can check the angle to maintain it by putting two nut flats together and the angle the bottom two flats give is close to the drill bit angle. So he tells the guy he will sharpen it for his use. Lim goes and gets it hung in the port and it breaks his fore arm so now the head will have to wait six weeks . During tha six weeks he stops on the mountain by a machine shop and they tell him a 1.5 end mill would be alot safer . Lim replies them are expensive ,the machinist replies probably not as expensive as the emergency room visit . Lim laughs and awiats healing up.
 
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mightymolinekid
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PostPosted: Fri Oct 11, 2013 8:02 am    Post subject: Re: porting tools........ Reply to specific post Reply with quote

A fellow asked a friend of mine at a pull this summer what he used to cut his tires. I'd imagine his answer would apply here too. He said "my checkbook". LOL
 
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Dblair
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PostPosted: Fri Oct 11, 2013 6:31 pm    Post subject: Re: porting tools........ Reply to specific post Reply with quote

stop it , stop it , I can't take any more while I'm rolling in the floor , just stop .
 
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MLPANKEY
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PostPosted: Sat Oct 12, 2013 6:57 am    Post subject: Re: porting tools........ Reply to specific post Reply with quote

A friend of ours d blair. Sent a txt to me and said quote a post full of good info from figuring cfm to sharpening drill bits with entertainment that held ones attention to the end. I wonxer if he is trying to take siskle or ebberts job.lol
 
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