Murph Posted September 14, 2004 Report Share Posted September 14, 2004 Okay, so my upgrades would have been fine, except my gears destroyed a Area1000 PolyCarb Piston. I searched around by didn't find any good reviews of upgrade parts. Right now I have a 9.6v 2000mah and Systema Flat Gears... Other things here and there. Anyone have any suggestions for a replacement piston? FYI here's a picture of the first tooth that got cracked off. Link to post Share on other sites
Bamse Posted September 14, 2004 Report Share Posted September 14, 2004 really odd, how many bb's has been fired? what spring is used? I have really nothing but good experiance with guarders pistons along with G&P's. I also heard good things about the Prometheus piston ... even if they had some minor flaws in the beginning. Link to post Share on other sites
nmcabecadas Posted September 14, 2004 Report Share Posted September 14, 2004 My best experience its with the blue Guarder pistons. Just check if this gun can be discussed here Link to post Share on other sites
Murph Posted September 14, 2004 Author Report Share Posted September 14, 2004 Not that many rnds (multiple hicaps over a month or so) when through it. The spring is slightly upgraded, but nothing absurd like other guys in the States do. Link to post Share on other sites
Murph Posted September 14, 2004 Author Report Share Posted September 14, 2004 My best experience its with the blue Guarder pistons. Just check if this gun can be discussed here <{POST_SNAPBACK}> Yes, I'm pretty sure it is UK limits. I haven't found where the latest revision of the Forum rules are. Can you point me in their direction? Link to post Share on other sites
Spike Posted September 14, 2004 Report Share Posted September 14, 2004 Yes, I'm pretty sure it is UK limits. I haven't found where the latest revision of the Forum rules are. Can you point me in their direction? <{POST_SNAPBACK}> Rules If I have worked out how to sue the HTML then click "rules" and it should take you there. For quick reference though 328FPS W/0.2G rounds (or 1 Joule, whichever you want to use). Link to post Share on other sites
Sale Posted September 15, 2004 Report Share Posted September 15, 2004 Murph never mentioned any spring rate or muzzle velocity. Just because a part is broken doesn't necessarily mean that a "forum restricted" spring was used. Murph: What gearbox, cylinder head and piston head you were using? I've sometimes seen slight measurement errors in CA boxes, and some piston heads require a certain cylinder head to match. Otherwise the piston might be positioned a little too back or forth, which could easily break it regardless of the brand. -Sale Link to post Share on other sites
Murph Posted September 15, 2004 Author Report Share Posted September 15, 2004 Sale... Stock TM gearbox, hurricanE upgrade parts, except for the Systema Flat gears and the "former" Area1000 polycarb. Bushings shims, etc. Link to post Share on other sites
Tripod Posted September 15, 2004 Report Share Posted September 15, 2004 Do you hold the trigger down for long periods of time? Was everything shipped correctly? What about the timing? Who did the upgrading? How experienced is that person? Link to post Share on other sites
Azrael Posted September 15, 2004 Report Share Posted September 15, 2004 does the gun have an extremely high rate of fire? over 1,250 rpm I mean? (if it sound a lot faster than other peoples aegs then use your computer to record a wav file of it firing, and then count the peaks in the wav file between the end of the one second marker and the sixth second marker, multiply that figure by 12, and thats your rpm.)- ah.. not possible with broken piston. Doh! If so, then I've seen this problem before, about three or four times, and no matter what you do- it will keep happenning, as you have chosen to make your gun fire faster than its supposed to. Go for a readily available supply of cheap pistons, as you will eat them quite quickly if your ROF is as high as I suspect. Link to post Share on other sites
ColSanders Posted September 16, 2004 Report Share Posted September 16, 2004 I've heard of systema pistons (area 1000 is systema) having some recent problems with the plastic being unusually brittle recently. I haven't had any problems with black systema polycarbs, or blue guarders as Nuno said. I've heard of the piston head coming slightly loose and throwing things out of wack, you might want to check that it isn't problematic. Alex "Col Sanders" SubzeroMTH@AOL.com Link to post Share on other sites
MTHaynes Posted September 16, 2004 Report Share Posted September 16, 2004 I have seen this before on upgraded ICS m4’s (m120). In the case of the ICS I attributed this poor alignment of the piston and sector gear. (Piston seems to go just a tad to far in some of the 2 part mechs after they have been taken down a few times.) Looks like the same thing. Did you change the cylinder head and the piston head? If its a stock head it may not be fitting correctly and allowing the piston to travel further than required causing poor alignment when the gear comes back to pick up the piston for the compression cycle. If the piston head does not fit snugly in the gearbox (you have l movement in the same direction as spring travel) it may be worth a cylinder / piston head upgrade. I recommend to folks that the do not do one without the other. Additionally please upgrade your spring guide as well if not done so already. Misalignment of the spring during the compression cycle can place additional force on the mechanism during compression. Gear timing is not a factor in the version 2 mech – the piston and gear set operate completely independently for half of the shot cycle. Timing (better referred to as synchronization in AS) is established between the gear and piston at the beginning of the piston compression cycle for each shot As recommended the G&P is a great replacement piston . Hope this helps Link to post Share on other sites
Hammer Posted September 16, 2004 Report Share Posted September 16, 2004 A rather high rate of fire shouldn't necessarily lead to the shredding of your piston. An AUG I had was firing at 1360rpm for quite some months with a standard piston with no ill effects. Even though you might expect a standar piston to give up before the gears (because plastic vs metal sounds like no contest) the piston has quite tough plastic as opposed to the relatively brittle standard gears. It sounds more to me as if something wasn't quite right in the first place if the piston has shredded. Either that or the teeth on the piston were shabby to begin with and were on their way out anyway (unlikely with an aftermarket one though). I suspect the piston was struggling to slide back & forth freely which resulted in much higher than normal stresses on it leading to premature failure. Link to post Share on other sites
sp00n Posted September 17, 2004 Report Share Posted September 17, 2004 Get a systema aluminum piston. If you break that thing, Ill pay to see that. I have one in my box and its great. Link to post Share on other sites
R22Master Posted September 17, 2004 Report Share Posted September 17, 2004 The aluminium pistons supposedly put more strain on your gearbox though. Life is full of compromises Link to post Share on other sites
Catchv22 Posted September 17, 2004 Report Share Posted September 17, 2004 How does it put more strain? I know I was advised Aluminum Piston Heads will definitely cause mechbox stress, although a very very cool noise. Link to post Share on other sites
R22Master Posted September 17, 2004 Report Share Posted September 17, 2004 It seems that because the aluminium is less inherently flexible than the polycarbonate pistons, the vibration is absorbed by the mechbox as it slams forward. With polycarb pistons, it is the piston itself that absorbs a lot of the impact. Makes scientific sense. Link to post Share on other sites
sp00n Posted September 17, 2004 Report Share Posted September 17, 2004 It seems that because the aluminium is less inherently flexible than the polycarbonate pistons, the vibration is absorbed by the mechbox as it slams forward. With polycarb pistons, it is the piston itself that absorbs a lot of the impact. Makes scientific sense. <{POST_SNAPBACK}> Bah. Id rather have it vibrate a little more than eat my piston every 3000 shots. Link to post Share on other sites
Catchv22 Posted September 17, 2004 Report Share Posted September 17, 2004 Sound reasonable to me. Still with a polycarb piston head I don't see much difference. Link to post Share on other sites
Murph Posted September 20, 2004 Author Report Share Posted September 20, 2004 Just to take out some of the confusion that has arised about my upgrade... I have an upgraded spring guide and also a new polycarb piston head (duh?) Anyways... It seems that things have boiled down to a debate between Alum vs. Poly pistons. I've heard bad and good things about both. I guess I'm just trying to make a decision at this point. Link to post Share on other sites
J Teezy Posted September 20, 2004 Report Share Posted September 20, 2004 Guarder Poly Carb blue piston. THe aluminum pistons and piston heads will make your gun a lot louder. It will be more of a "CRACK" sound. Now to me i dont like the idea of aluminum piston heads, especially on a TM gear box. Metal hitting metal dont sound like a good idea to me. Now if i for some reason was going to use an aluminum piston head i would only do it on a reinforced gear box. Link to post Share on other sites
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