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How To: DIY cylinder head tapering!

11699 Views 12 Replies 10 Participants Last post by  ~Ranger~
If you hurt yourself, or damage anything, I'm not responsible.

This is a cheap and cheerful mod that you can do in get a decent gain in FPS (between ~15-30). It requires some power tools, so please be careful!.

What You will Need

Cylinder head of your BASR (I used one from my BAR10)

Electric Drill

Rotary Tool (I used a Dremal), With a cone shaped sanding head

Three different grits of sandpaper (I actually used two grits of abrasive cloth, one 219, the other being 100, and some 220 grit sandpaper)

Paper towels and some Q-Tips


Wheel polish

Terrycloth Towel

What to Do:

Step One:

Insert your Cylinder head with the nozzle facing into the chuck of your drill, and tighten the chuck. This creates a ''poor mans lathe", which can be useful for many things.

Step Two:
Turn on your rotary tool, and spin up your drill. contact the sanding tip to the hole at and angle, and start to shape and form your cylinder head. here is mine before any kind of sanding after being shaped.

Step Three
Start sanding using your coarsest grit, and then medium, then finest (I suggest wet sanding on the finest grit). Work the paper in and out of the head, making sure to get the whole thing.
here is mine:

If you don't have any of the optional stuff, you just need to give it a good cleaning, and your done!

If you do have it, follow the instructions on the container to achieve a bright, shiny finish. I suggest you cut the compound with water. This makes it less able to remove material.

Here is an unpolished one compared to one that is polished:

Thanks for Reading!
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Very nice, did this on my own a long long time ago, gave me a power boost. I didn't polish it, although I did sand to 600 grit. I should probably go back and polish it properly. Another thing I did while I was at it was boring out the nozzle, that also helped coax out a bit more power.
The idea is no where near original, but I figured people would like a guide, and the fact that Fuzzy is a sucker for anything with ''How-To" in the title

Sticky worthy?
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Nice job on your "How To" guide!
+1 :)
Could this post be sticked? I see alot of people asking how to do it.

Agreed. I post this link quite often for others because it's on the old forum and most people don't even know about it :shrug:
Idea : for people that struggle with english etc. but are willing to mod. Do a tut video ... sounds lame cuz it's "easy". Just an idea
Idea : for people that struggle with english etc. but are willing to mod. Do a tut video ... sounds lame cuz it's "easy". Just an idea
I would make one but I don't even have a dremel at the minute!
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Yh, I wonder if Im going to just try or wait for a real tut video from you. Loved the TDC. made me do it at the spot. :p
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Just be careful with taking off too much material. It can get ugly if you take off too much.
Yeah... I had a thread on this at the old forum. Gave my ASR a good +20 and more stable FPS. +1 anyway ;-)
Very sweet job bro! I am going to attempt this myself soon. Great write up on it too!

I vote stickied!
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