[Solved] Severe compression issue.

[Boyso]

Originally Posted by Thenooblord

cracked cylinder head? or borken oring

I noticed the nozzle wasn't perfectly straight. That's why. :P (Check pic in previous post)

[Kid]

Originally Posted by Thenooblord

oh no tahts fine, just duct tape it back on and its good to go!

Anyway, HOW did you overlook that? Haha! "wasn't perfectly straight" is an understatement.

[Boyso]

I believe it was only a fissure at first. But after a day of assembling, dissassembling, swearing, trying new parts combo, I probably damaged it more :P

Thankfully, there's a nice Modify cylinder head in the Classifieds right now

[Amos]

Originally Posted by LastSpartan

Ah. HA!

Found the culprit.

Let's just say I won't buy anything from ARS ever again, I believe.

I'll snap a pic in a second.

EDIT : Here it is :

PM sent, The owner of ARS takes GREAT pride in his products, you can probably get a replacement.

I've installed over 50 of these kits and I've never seen this problem... This may have been one of those cylinder heads that snuck past quality control

The ARS parts are top notch otherwise.

[Boyso]

Oh and I'd like to add, it was used under 5k cycles. So it's not one of these 10 yrs old guns, the gearbox is pretty much new with no wear anywhere, except, on the head :P

[coach]

Makes me wonder if you had some weird blockages or during install accidentally bent it. Wouldn't take much if you were installing it and put the upper on and off many times. If the inner barrel/ hopup isn't fully forwards when you put an upper on, you could have put some downward pressure on the nozzle, and in turn, the tip of the cylinder head. Once it is bent, cycling it as normal could have put excessive wear on it causing it to break.

Don't get me wrong. I understand you aren't sold on ARS but this is quite an odd failure. It could have been defective from the factory or you could have dropped it or rested something on it unintentionally.

[Boyso]

Yeah that's totaly plausible. But it's hard to find out without going CSI :P

Sadly, I was happy when I found out what was broke lol.

[coach]

fair enough, but I wouldn't stop using all ARS product just because of this one situation. personally, unless this is replicated by a few other people/gun docs, I still stand by ARS and will use them in my builds.

[Boyso]

Yeah I know, I was getting awesome airseal with them. I guess I was just unlucky, or excessively hard on them as both the cylinder head and the piston head broke on me :P (Piston head was clearly my fault though, as I had forgotten to check the tolerances within my gearbox, and clearly, it had not enough clearance).

I do love Sorbos though, I just hope my next set won't break. Might be time to try their 3G line ^^

[Jackarutu]

I would like to hear more about this tolerance that caused the piston head to break. What possible tolerance of the gear box itself affects the piston head? If the grove on each side of the piston were pinched that would cause a possible lockup but not a broken piston head. Could you ID what these tolerances are so we may learn from your experience?

[Amos]

You had to modify your lower receiver right?

Can I get a pic of it, looking at the airway it looks like you've got some pretty severe friction marks on it... this leads me to believe the hop and barrel aren't lining up properly with your cylinder head (and would explain your FPS issue)

[Boyso]

Originally Posted by Jackarutu

I would like to hear more about this tolerance that caused the piston head to break. What possible tolerance of the gear box itself affects the piston head? If the grove on each side of the piston were pinched that would cause a possible lockup but not a broken piston head. Could you ID what these tolerances are so we may learn from your experience?

The rails on the piston (Modify) caused friction and then, seemed to have caused the piston head ripping out of the piston (I hadn't locktite it down though, but it ripped right where you screw)

I basicly filled down the rails on the piston itself, and abit on the shell. No issues afterwards with the Modify piston head :wink:

Originally Posted by Amos

You had to modify your lower receiver right?

Can I get a pic of it, looking at the airway it looks like you've got some pretty severe friction marks on it... this leads me to believe the hop and barrel aren't lining up properly with your cylinder head (and would explain your FPS issue)

I dremel'd out a part of the plastic lower receiver in order to install a one piece metal receiver. However, recently I've had issues with the outer barrel, basicly falling from my gun (stupid screws). Maybe it bent the inner barrel/Hopup downward.


I will post pics of the lower receiver, shell and cylinder head tomorrow morning, with a good camera

I'm heading off to bed now :P

I want to add, that this is most likely a personnal error, and not the fault of the MASK kit. I'm just good at messing stuff sometimes

[Amos]

Originally Posted by LastSpartan

I dremel'd out a part of the plastic lower receiver in order to install a one piece metal receiver. However, recently I've had issues with the outer barrel, basicly falling from my gun (stupid screws). Maybe it bent the inner barrel/Hopup downward.

Yea... that definitely sounds like it could be the problem here.

The airway on your cylinder head is showing some pretty crazy friction marks..

Could you get me a cleared picture of the piston head, and a picture of your lower?

[Boyso]

VoilÃ*.


http://img121.imageshack.us/i/img1715p.jpg
http://img543.imageshack.us/i/img1716g.jpg
http://img835.imageshack.us/i/img1717rg.jpg
http://img830.imageshack.us/i/img1718el.jpg
http://img822.imageshack.us/i/img1719p.jpg

[Amos]

Yup I can see the problem right there,

You didn't remove enough material from your lower.



There's yours, the red is what you need to remove.


Here's a 1st gen CA lower for comparison.




So your cylinder head wasn't faulty, it had some pretty crazy stress on it from the body.