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Old 08-29-2011, 02:07 PM   #1
MGunner   MGunner is offline
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How To: DIY cylinder head tapering!

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

Optional:

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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Last edited by MGunner; 04-17-2012 at 02:31 PM.
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Old 08-29-2011, 06:13 PM   #2
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How To: DIY cylinder head tapering!

Very nice, +1 for you.
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Old 08-29-2011, 11:14 PM   #3
dhm078   dhm078 is offline
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How To: DIY cylinder head tapering!

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.
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Old 08-30-2011, 11:07 AM   #4
MGunner   MGunner is offline
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How To: DIY cylinder head tapering!

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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Old 08-30-2011, 01:57 PM   #5
bushman   bushman is offline
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How To: DIY cylinder head tapering!

Nice job on your "How To" guide!
+1 :-)
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Old 04-17-2012, 02:31 PM   #6
MGunner   MGunner is offline
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Could this post be sticked? I see alot of people asking how to do it.
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Old 04-17-2012, 02:40 PM   #7
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+1

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
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Old 07-21-2012, 04:17 PM   #8
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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
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Old 07-21-2012, 05:52 PM   #9
MiloXC3   MiloXC3 is offline
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Quote:
Originally Posted by hybelmoskus View Post
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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Old 07-21-2012, 06:12 PM   #10
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+1

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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Old 07-21-2012, 11:17 PM   #11
 
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Just be careful with taking off too much material. It can get ugly if you take off too much.



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Old 07-22-2012, 10:07 AM   #12
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Yeah... I had a thread on this at the old forum. Gave my ASR a good +20 and more stable FPS. +1 anyway ;-)
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Old 07-22-2012, 08:45 PM   #13
 
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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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