Piston/gearbox issue

[etd]

I just purchased a Prometheus hard piston to replace the last piston as it failed. I am running around 29~30 rounds per second at 390 fps after short stroking and of course removing the second tooth to ensure proper engagement. The problem is all other partial metal tooth pistons are failing under the high strain. The non-metal teeth and being torn up. Even when I ran a non short stroked piston. So basically I need. Crazy strong full metal teeth piston. Something reliable. Ideas?

[Azathoth]

System Supercore. Non metal teeth is stronger and lighter. You can also try the azimuth pistons with full metal teeth.

Their are guys on Airsoftmechanics running cylone sector gears and much higher FPS and not having as bad problems as you are making yours out to be. I would check AOE again.

[Amos]

Yup, System Supercore.

[theguy]

As I said when you asked for a super strong piston a few weeks ago,

System Supercore

[etd]

The promethus hard piston is suppose to be the 2nd best piston on the market. After only seeing less than 150 rounds it shows some heavy wear. The supercore can't be that much stronger. As a side note I was going to buy the supercore before but they were out of stock so I grabbed the Prometheus instead. This is why I am thinking of going with a full metal piston. From what a few of you are saying the supercore is the best.

I feel that there might be something causing the wear I just can't pin point it. It doesn't make sense. Non of my other Aegs are having this type of wear issue. this is my 3rd piston that is fubared in the past 3 months

[Amos]

There's a problem with your gears / shimming / AOE then.

[venture]

Here is a great (and cheap) piston solution. If you need strong piston gears go this way:

http://www.airsoftgi.com/product_inf...oducts_id=2975

with this for flat gears:http://www.airsoftgi.com/product_inf...oducts_id=2976

or this for helical gears:http://www.airsoftgi.com/product_inf...oducts_id=2977

Please remember that if you don't have the very strongest gears then you will just move the problem from the piston to the more expensive gear set. However, this piston solution is great because you can keep stripping the gears for $10 per shot until you find your problem. It is probably a shimming issue - ensure that when all gears are shimmed that you can set the piston/cylinder into the mechbox half and have the sector gear line up perfectly with the piston teeth. Also, don't forget the problem we had before with "length before set" of the spring. If it is still close you may be better off with a stiffer yet shorter spring. Your rate of fire is quite high for a spring of that power (M120 I would guess by the fps you are getting).

Good luck, ETD. I have watched you develop this gun over the past few months (with pertinent questions in this forum and the sale of your leftovers on the parts/accessories forum) , I hope you will post a nice review/ photo layout in the near future.

[etd]

I will try the jbu piston as it's cheap to replace the teeth ($8) so it will give me an excuse to upgrade my gearbox and move to bigger bearings.

On a side note, I had short strokes my piston/gears because I was told there maybe a length problem with my m120 (good guess btw) due to the having a linger cylinder head, bearing piston head and bearing spring guide. I just checked the alignment of my gears and it's perfect. I am running a modify smooth gearset so there is no shimming required. I use to shim myself with my stock set but I needed new gears anyways. I took a look a possible spring solution however to move to a stronger spring to ( I am assuming this is what you are getting at, correct me if I am wrong) lower my rounds perminute I would need to go to an sp spring. The spring comparison charts on the asc forums show that if I did so my fps would be raised to around 115 with my current short stroking. Is it SAFE to short stroke three forward teeth or will that fubar thempisron's integrity.

Originally Posted by venture

Here is a great (and cheap) piston solution. If you need strong piston gears go this way:

http://www.airsoftgi.com/product_inf...oducts_id=2975

with this for flat gears:http://www.airsoftgi.com/product_inf...oducts_id=2976

or this for helical gears:http://www.airsoftgi.com/product_inf...oducts_id=2977

Please remember that if you don't have the very strongest gears then you will just move the problem from the piston to the more expensive gear set. However, this piston solution is great because you can keep stripping the gears for $10 per shot until you find your problem. It is probably a shimming issue - ensure that when all gears are shimmed that you can set the piston/cylinder into the mechbox half and have the sector gear line up perfectly with the piston teeth. Also, don't forget the problem we had before with "length before set" of the spring. If it is still close you may be better off with a stiffer yet shorter spring. Your rate of fire is quite high for a spring of that power (M120 I would guess by the fps you are getting).

Good luck, ETD. I have watched you develop this gun over the past few months (with pertinent questions in this forum and the sale of your leftovers on the parts/accessories forum) , I hope you will post a nice review/ photo layout in the near future.