Creator

iTrader: (1)

This seems pathetically stupid to me (so flame on if you will)but, I'm not finding a good source for dremel bits to use to port match an intake manifold to a throttle body. It being a honda u should know I'm working with aluminum. What do you guys use and where did ya get it? Pics would help too.

Phil M

PM Rocket, he is the all-motor porting god and engine guru.

93egSLEEPER

Or send it to maxbore

Cynical 1

Or look on summitracing.com for a porting kit... Or google...

DDTECH

93ericSi

I never had good luck with the large fluted bits that were "designed" for aluminum. Used small barrel type bits and made sure lubrication was on point. ATF seemed to work well and I had a lot laying around the shop when I gasket matched my whole manifold.

Flap wheels/polyfans clean up nice too but take awhile on TB matching

GhostAccord

You're not going to find anything for a dremel. You need to upgrade to a die grinder or pencil grinder and some bur bits and cartridge rolls of varying grits. Summit Racing has a few good kits... Your local auto parts store may also sell smaller kits of cartridge rolls for cheaper.

Here are the carbide burs that I use on a regular basis;

These are all double cut bits with 6" shank. I have cut two of them down to 4" since this picture was taken.

I use a little bit of WD40 for cutting fluid and let the bit do all the work. These bits remove a lot of material quickly if you put to much pressure on them or use to a high of an RPM. Cut through aluminum like a hot knife through butter....

motoxxxman

home depot and lowe's usually has a great selection of dremel bits. I use carbide burr bits like pictured above but for a dremel, as well as sanding rolls and flapwheels, all for dremel, all bought at home depot. I also have some standard milling bits as well that I use on occasion

hondamark35

there is stuff out there, single-cut (Al cut) burr bits in varying shapes. i've used them for oil pump porting and other tight spaces and intricate work. They would take forever for port matching, which is why...
I agree 100% with this. I've had decent success with the cheapy discount tool store electric die grinder. more expensive ones are worth the money though, so OP, if you expect to use it often, invest!

93ericSi

Local swap meet = air powered die grinder for $10-15. Still have the same one for about 2-3 years and who knows how old it really is.

88cr-rex

Will second the consensus so far. The dremel is no match for an air powered die grinder.

The only reason to not use a die grinder at first is you can get carried away since the material is being cut much faster (unless you start off a cast iron head).

I use a $20 craftsman powermate die grinder and then a swivel attachment so its easier to move when attached to the hose.

You can also buy individual burrs from McMaster-Carr:

http://www.mcmaster.com/#carbide-burs/=p2p2yv

GhostAccord

If you buy an electric pencil grinder you could set the speed to the lower setting. Or with a pneumatic die grinder you can turn down your air pressure. That way you can regulate the speed of the grinder and start off slowly. Then build yourself up to regulating speed with the trigger.

I agree that having a spare/scrap piece to practice on for starters is a great idea. I woulds suggest practicing on the same media that you will be working on. Go to the scrap yard and see if you can find a junked cylinder head. Doesn't have to be Honda, but it should be aluminum.

hondamark35

there is also this set from Grizzly Industrial. i ordered a single-cut version of this set from them a few months ago. i don't see it on their website currently, but if you can find it it's a pretty good deal and great for getting started.

GhostAccord

McMaster-Carr is where I got mine. This is the page that I go to for bits; http://www.mcmaster.com/#rotary-deburring-tools/=p2idwt

They also have a large assortment of abrasives for finishing the ports.

Creator

iTrader: (1)

I didn't have much hope after the first two posts, but this is great. Thanks so much guys. I have already checked the local Home Depot and Lowes, and they have the cheesy dremel bits that take forever to remove any material(good for finishing up though). I even searched summit although I guess I didn't use the right terms. I've done a bit of grinding, cutting and massaging so I'm pretty sure I should be ok, but I have a wasted head I can play with anyways. Fortunately there is a harbor freight close and I've already sourced a pneumatic die grinder there. Again thxs to those that posted(even those that weren't much help).

FlewByU352

Never had good luck with any Dremel bits. It took me hours to bore from 64-70MM at the throttle body opening of the manifold. After that I said next time I plan on doing any type of material removing... I will buy a die grinder and real carbide cutting and finishing bits.

GhostAccord

Did you check out the selection of grinders on the McMaster-Carr website. http://www.mcmaster.com/#die-grinders/=p2xj32 I bought one of there "maintenance grinders" for $15. It has lasted me over 3 years of frequent use. Considering I burnt out 2 Dremel tools in 1 year before I switched to air. Air tools or a quality adjustable electric grinder are well worth the investment. Only thing with air is the tools are relatively cheap...the compressors.. not so much. However they are very versatile.