So I bought a ramhorn manifold from a h-t douchebag wannabe fabricator and the wastegate hole is only partially drilled out. What I mean is that the hole that was drilled does not match the wastegate flange. So as of now, there is a 38mm flange welded onto a 25mm hole.

How can I cut the hole bigger to match the flange? Is there some sort of bit I can attach to my air tools that will eat away stainless steel? I have a bunch of bits that will eat through aluminum like it's butter, but they won't even scuff the stainless.

 

i have a carbide tip cutting tool bit thingy majigger. actually im not sure what its called but ill find a pic. it cuts stainless just fine for me. lets see here...





well its called a rotary carbide file bit. mine is similar to the one in the middle. it has like two cross patterns. it eats the stainless great and cuts mild steel like butter.

 

The two carbides on the right will cut stainless just fine, the one on the left is for aluminum only.

 

Sears sells them, they are the same tips used for porting your head(in general).
Just make sure you go slow and steady, you don't want to remove to much at one time. I'll see what I mean when you get the carbide tips.

 

Well my roommate has a couple of carbide bits for porting aluminum and I use them all the time. They look like the ones on the right hand side of the pic posted above.

But the bits cost $20 each and my roommate freaks if I try to use them on anything but aluminum. If I use the bits on stainless, will it rapidly dull them, or is my roommate just a big baby?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Enzo Speed &raquo;</TD></TR><TR><TD CLASS="quote">Well my roommate has a couple of carbide bits for porting aluminum and I use them all the time. They look like the ones on the right hand side of the pic posted above.

But the bits cost $20 each and my roommate freaks if I try to use them on anything but aluminum. If I use the bits on stainless, will it rapidly dull them, or is my roommate just a big baby?</TD></TR></TABLE>


uhh the aluminum one is very cors e. youll break the teeth righ toff .
you need the fine grit one ..

 

I actually need some myself. Good stuff.

 

us airweld or any kind of welding supplier has carbide tungsten bits. but in order to use them you're going to have to operate them at a high RPM because if its to slow they'll shatter/chip.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Enzo Speed &raquo;</TD></TR><TR><TD CLASS="quote">Well my roommate has a couple of carbide bits for porting aluminum and I use them all the time. They look like the ones on the right hand side of the pic posted above.

But the bits cost $20 each and my roommate freaks if I try to use them on anything but aluminum. If I use the bits on stainless, will it rapidly dull them, or is my roommate just a big baby?</TD></TR></TABLE>

the 2 on the right are for mild steel/stainless. The one on the far left is for aluminum. The one in the middle is called a double cut because it has 2 sets of grooves cut into it to remove material quickly. the far right one is a single cut and leaves a slightly smoother finish but removes material faster.

If you use a steel one on aluminum it will clog up pretty quick unless you use something like wax or wd-40 to lube it

americancarbide.com is a great place to get good quality burrs for not much money

 

they will work but will take forever. I worked a B-series turbo manifold onto a D-series and used these bits to lengthen the mounting holes. Took me forever. But then again, that was on a 1/2" flange