tools used to bore a stock 4.0L HO throttle body

[Shomsky462]

ok so ive searched and search and found tons of info on boring a throttle body. boring it to 60mm and 62 mm and lots of other stuff.
but the one thing i couldnt find is what tools so you guys use to bore it out? im not looking to bore it the whole way through just where it tapers in after the butterfly valve thing.
thanks
-Shomsky

[5-90]

Ideally, you'll clamp it to a mill table and use a boring head.

Less ideal, use a four-jaw chuck on a lathe, and use a boring bar for the lathe.

LAST RESORT - sanding drum in a drill motor or drill press. This is not RPT not recommended - you have no real way to control the finished size as closely as you need to!

[BBeach]

Some people use sand drums on a drill press or hand drill. I usually used a grinding stone for the initial removal then a dremel with a metal removing bit, then the dremel sanding drums, then a fine grit 240 or 320 brush on the dremel to polish it. And a T-20 to take it all apart.

[BBeach]

LAST RESORT - sanding drum in a drill motor or drill press. This is not RPT not recommended - you have no real way to control the finished size as closely as you need to!Come on, its not that easy to screw up! :rof:

[Shomsky462]

ok thanks. since i got the TB for free i think im just gonna use an air dremel and sanding drum and other bits and stuff.
thanks
-Shomsky

[5-90]

Come on, its not that easy to screw up! :rof:

Maybe not for you or me, but I don't know the skill level of the OP, nor do I know how much experience they've got working metal. Therefore, I default to "little to none."

Fortunately, he's got one to screw up on - so he'll be able to learn on scrap. That helps...

[BBeach]

ok thanks. since i got the TB for free i think im just gonna use an air dremel and sanding drum and other bits and stuff.
thanks
-ShomskyIts not too bad, just be consistend and dont put much pressure not stay in the same place for too long.

[j99xj]

When I bored mine with a sanding drum I left the throttle blade in place so that I wouldn't screw up the tight seal the blade has against the side of the bore.

[Shomsky462]

although im only 17 im not a complete tard when it comes to metal fabrication. i have done some metal fabrication so far on my jeep. i cut up and welded together a nice front diff skid, a t-case skid, i welded on my control arm mounts for the RK LA setup. and in a couple of days ill be receiving a complete custom DIY steering setup from poison spyder

heres the gas tank skid i did:
http://www.naxja.org/forum/showthread.php?t=85632&highlight=dual+stock+gas+tank+skid
so yeah even if i do screw it up whatever, but ill be careful and try an make it as round as possble.
thanks
-Shomsky

[5-90]

Not trying to disparage you at all - and there is a difference between adding metal and removing it... After all, you can always cut a little more off, but you can't "cut any on."

The main reason for saying what I did was why I said - because I don't know your skills or experience with metal. When I'm forced to make assumptions, I err as much on the side of caution as possible - too much is almost enough, in most cases.

And, for the benefit of anyone else reading this. If you do a good job and post pix of your work - great! Just make sure that you also state what sort of experience you have that allowed you to do such sound work, so other readers can make an informed decision if and when...

[Kurt04]

I wouldn't do if I couldn't do it right and the right way is to bore it in a mill. Any machine shop that has a Brigdeport mill should have a boring head. Once its indexed in it should take but a couple passed to get it to the size you want.

[CartsXJ]

I chucked mine on up on a 3 jaw chuck in the lathe on the ID of the throttle body, then used a boring bar to open up the ID to match the diameter on above the butterfly.

So far I've done both multiple 60mm straight thru bore and also a few 62mm TB this way. Plus I have a plate program for the easy-trac bridgeport to make the plate.

Its all about knowing what tools you have and how to utilize them.

[mecompco]

I recall some people have used a emery "flapper" wheel or whatever it's called chucked in a drill--I would think that would take material off more uniformly than trying to use a Dremel. Luckily, a machinist buddy did mine for free on his lunch hour at work.