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Dec 18 2007, 07:12 PM
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![]() ASF Citizen ![]() Group: Authorized Seller Elite Posts: 1,721 Joined: 5-September 07 From: Misawa Japan Member No.: 33,075 |
Well I finally decided to buy 2slo2ugly's JG beta spetz AK. I really liked it for some reason. I figured it would be an excellent loaner or project gun.
(*note: all small thumbnail pics can be enlarged by clicking.) So I decided to make it into a low power CQB bb hose. I decided to take the element kit, short stroke the piston, swiss cheese the piston, rewire the gun with a basic mosfet and deans plugs, break in the gears and the motor. Reshim and retune the gearbox. here she is before... ![]() I bought an element full tune kit from ROman for 30 bux! So far I spent 90 bux on the gun. here is the ELEMENT ftk... ![]() The battery mike gave me was a 1200mah 8.4v NIcad battery. It totally sux ![]() The stock configuration measured at 305fps at 12 rounds per second. (all measurements were made with guarder 2008 speedy chrono using killer beez .20 bb's) ![]() ![]() ![]() obviously there was ample room for improvement. I cracked open the gun and got to work. I use a white towel or similar when working on AEG's so that any parts lying around can be easily found. I also lay the parts and hardware together in an orderly manner so reassembly is headache free(for the most part lol) ![]() The gearbox seemed to be of decent quality and it had an ICS motor. not bad. here is the stock gearbox... ![]() ![]() Step one *gearbox overhaul* I used carb cleaner to strip all of the grease from the gearbox and added the Element metal bushings which were a tight fit. I super glued them in place as well. I then shimmed the gears and broke in the motor and then the gears using a tub of water and an old/weak nicad battery I have. I also used a heat gun to expand the piston head o-ring a bit. ![]() ![]() ![]() Be sure if you use the water method to break in your motor that you do 2 minutes reverse polarity and then 3 minutes normal polarity. when you are done you must get all of the water out. brake cleaner does this task extremely well. Step 2 *short stroke the piston* The factory piston head had a large weight on it. The element version has no weight added but does have ball bearings. In a high ROF setup, you may want to use a head that has no bearings to save weight. Since the element head was still lighter than stock, and the only one I had on hand, I used it. ![]() I am only short stroking the piston by one tooth. you can remove even more, but remember you lose about 10-15 fps per tooth removed. You also have to cut teeth from the sector gear accordingly. (more on that later) First I removed the steel tooth from the element piston. Then I used a razor and a dremel to remove the last tooth. I also had to make the channel for the last tooth longer so that it can slide back to it's new position. ![]() In order for the metal tooth to slide all of the way back, you need to file down that stopper. ![]() Now I need something to fill this gap. Notice that I left a small portion of the second to last tooth to help me line up the last tooth's new postion. ![]() To fill the gap, I used another metal tooth and dremeled off that stopper to fit like so. ![]() ![]() an easy way to avoid doing all that , is to simply buy a piston with more than one metal last tooth and file off as many teeth as you want so long as the last tooth is still metal. next I swiss cheesed the piston a bit. I did not have a larger drill bit so this is a mediocre swiss cheese job. When done correctly, swiss cheesing can increase ROF by 5%. This works because there is less overall mass for the motor to have to throw around. ![]() ![]() Finally you must remove the 2nd tooth to ensure proper gear meshing at high speeds. This will ensure the longevity of the piston and MUST be done for a high ROF setup. here are some pics of that process... [img]http://i7.photobucket.com/albums/y284/meancivicsi/th_IMG_4361Medium.jpg[/img] [img]http://i7.photobucket.com/albums/y284/meancivicsi/th_IMG_4360Medium.jpg[/img] whoo hoo , piston is finished! Notice the absence of the 2nd tooth! [img]http://i7.photobucket.com/albums/y284/meancivicsi/IMG_4372Medium.jpg[/img] Now I have to remove a tooth from the sector gear. I choose to remove one from the initial catch side to keep the tappet plate timing optimal, although for removing only one tooth, it doesnt make much difference which side. [img]http://i7.photobucket.com/albums/y284/meancivicsi/IMG_4357Medium.jpg[/img] [img]http://i7.photobucket.com/albums/y284/meancivicsi/IMG_4359Medium.jpg[/img] Lastly I rewired the whole gun with teflon 16 ga wire, deans plugs and a simple 1404 mosfet setup. [img]http://i7.photobucket.com/albums/y284/meancivicsi/IMG_4376Medium.jpg[/img] [img]http://i7.photobucket.com/albums/y284/meancivicsi/IMG_4377Medium.jpg[/img] used and angle grinder to cut the butt plate to allow external battery sources. [img]http://i7.photobucket.com/albums/y284/meancivicsi/IMG_4393Medium.jpg[/img] RESULTS!!! ok now here is the improvements that resulted from all of that work. velocity is between 322 and 315 now. This is surprising since there is a bad air leak between the cylinder and cylinder head. We also cut a tooth off which reduces fps. I guess the airseal improvements and bearing spacers bumped the fps up 30 fps or so over stock. [img]http://i7.photobucket.com/albums/y284/meancivicsi/IMG_4407.jpg[/img] test 1 8.4v battery 9.97v measured at time of test. 17-19 rounds per second that sux but is better than 12 rps!! lol [img]http://i7.photobucket.com/albums/y284/meancivicsi/IMG_4389Medium.jpg[/img] with the 9.6v powerizer battery( I know powerizers suck, but its all I had at the moment.) 24 rounds per second! not bad considering it only shoots 12 rps stock [img]http://i7.photobucket.com/albums/y284/meancivicsi/IMG_4408.jpg[/img] Over all the results are a step in the right direction. although I am a little dissapointed in the rof. next installment for this ak will be a... - better motor but an ecanomical one. maybe guarder. - better battery 7.4 or 11.1v lipo 12c-25c (economically priced one) - capacitor bank setup Thanks for reading any questions please pm me [img]http://i7.photobucket.com/albums/y284/meancivicsi/IMG_4396Medium.jpg[/img] -------------------- |
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GoLgo 13 Budget High Speed Guide Dec 18 2007, 07:12 PM
ICS4life Use an Intellect 10.8v or make a custom 12v with a... Dec 18 2007, 07:39 PM
KhaosAwakened wow this will be very helpful for many users to co... Dec 18 2007, 07:42 PM
bat21win Renamed "Budget High Speed Guide", and P... Dec 18 2007, 08:15 PM
GoLgo 13 Wow, it's an honor for this to be a sticky. N... Dec 18 2007, 08:42 PM
bat21win QUOTE (GoLgo 13 @ Dec 18 2007, 07:42 PM) ... Dec 18 2007, 09:10 PM
GoLgo 13 *UpDaTe!*
OK well I ordered a brand new Toky... Dec 28 2007, 12:19 PM
rsdntevl What exactly does rewiring do? Jan 7 2008, 06:41 PM
sc0rp10n Does your motor get very warm at all? I have const... Jan 25 2008, 11:25 AM
moky Very informative post sir, just 1 question? Where ... Jan 31 2008, 06:53 PM
skippy you can get them at most local hobby stores.... ma... Jan 31 2008, 07:56 PM
Saturos Wouldn't drilling holes in the piston signifig... Feb 5 2008, 08:42 PM
zachbiz QUOTE (Saturos @ Feb 5 2008, 05:42 PM) Wo... Feb 10 2008, 12:16 PM
BeAsT! QUOTE (zachbiz @ Feb 10 2008, 05:16 PM) n... Feb 10 2008, 05:52 PM
-(eset)-HX QUOTE (BeAsT! @ Feb 10 2008, 05:52 PM... May 10 2008, 08:33 PM
xsboredom2 QUOTE (-(eset)-HX @ May 10 ... May 11 2008, 12:52 AM
Krispy Hi, Sorry to be a Newbie, but I'm from England... Feb 12 2008, 08:43 PM
xsboredom QUOTE (Krispy @ Feb 12 2008, 05:43 PM) Hi... Feb 13 2008, 01:42 AM
Krispy Thanks :P Ordering one from GolGO himself, if anyo... Feb 13 2008, 07:07 PM
insanebinky nice guide! Helps a lot Feb 20 2008, 02:45 PM
Alpha Elite Where did you get the Element FTK? I need to upgr... Feb 29 2008, 06:24 PM
Krispy Hi mate, I followed this guide, and you can either... Mar 1 2008, 02:09 PM
dy3h4rd great guid I plan on doing somthing like this on m... Apr 28 2008, 05:42 PM
StarvinMarvin That's awesome and you doubled the rps. Great ... Jun 17 2008, 08:01 PM
kamizla Swiss cheesing the piston weakens it making it pro... Sep 8 2008, 02:11 PM
xsboredom not true. There is no way for it to break on the p... Sep 8 2008, 08:58 PM
aks QUOTE (xsboredom @ Sep 8 2008, 09:58 PM) ... Oct 16 2008, 02:06 PM
DutchManDan I think I may be using this to help a little when ... Sep 8 2008, 09:14 PM
TomSiv hey, I'm kind of confused on the "breakin... Dec 19 2008, 05:15 PM
cc11rocks quote"I bought an element full tune kit from ... Dec 25 2008, 02:16 PM
blacklockdown this will be my very next project. what kind of ca... Jan 26 2010, 03:23 PM![]() ![]() |
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