Best Dremel bit for porting plenum mouth

[BLACK'98DSM]

I need to bore my stock intake manifold to support a 60mm throttle body. I'm just wondering which bit will be best for this. When I smoothed the grit off of the lower runners I used the rotary sanding bit, but I know that bit is not aggressive enough for this task.

Or if you have any other ideas on how to do it myself, please post them here. Thanks

 

[silvreclips]

Carbide burrs from Amazon work work. It will take a while to remove all that material.

 

[97egl]

When you are looking at burrs find one that has decent gaps between the teeth. If you get one that has small teeth the aluminum tends to clog them up.

I would also really recommend grabbing a 12 dollar die grinder from harbor freight and getting 1/4" burrs for that. It will be MUCH MUCH quicker. But if you don't have an air compressor or just want to work with what you've got just make sure you get burrs with decent spacing on the "teeth"

 

[Mello]

Get something like one of the burs for aluminum shown in this McMaster link. We'll need to narrow the search in their navigation pane.

 

[motomattx]

Maybe have your local machine shop bore it for you, it would not cost much at all and would be cleaner and consistent/professional which is what airflow really needs in that area, I would be surprised if it would be cheaper to buy the tools to do the job vs having it done by a machine shop.

 

[silvreclips]

Just a tip. Keeping the burr lubricated will help the AL not gum up and stick to the burr

 

[97egl]

Just a tip. Keeping the burr lubricated will help the AL not gum up and stick to the burr

What do you find works best for lubricant? Grease or Oil? I've not tried this before but I'll bet I'd have saved a lot of money in burrs if I had known.

 

[donniekak]

I use wd40 when cutting aluminum. Except the last cleanup before welding.

 

[silvreclips]

I used wd40 last time I was grinding on a bunch of aluminum.

 

[BLACK'98DSM]

SAE 30 works well on the drill press, otherwise like stated the WD-40 will be fine.

 

[BLACK'98DSM]

After breaking a few bits, I found that this one holds up best, and removes the most amount of material quickly.

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