[SilentScope]

I'm missing a lot of expected fps (shooting 450fps with a m170 spring) and I've checked all my bases.

I've double, triple, etc checked every component + air seal connection and to no avail :[ I'm still missing a pdi hop up chamber w/ tbb and systema bucking.

I know the tbb and bucking "shouldn't" increase fps by that much sooooo anyone think the PDI chamber can remedy this large fps loss?

 

[Wolfgeorge]

I don't think you'll gain anything from the hop up chamber.
Maybe the seal between bucking-nozzle isn't good.


Wolf

 

[SilentScope]

Maybe the seal between bucking-nozzle isn't good.

Is there any way to improve on this aspect? When the bucking was teflon taped + flossed, it was shooting 450-460ish fps and without the tape+floss it was shooting 450fps. Therefore I believe the bucking health is not an issue.

The cylinder head does seem to have a little loose space when it's inserted into the bucking, but I placed a small square piece of teflon in the magwell as I shot the gun upside-down and the teflon tape barely moved.

Could a piston cause blow-by even though the cylinder head compression test gives excellent results?

 

[wyvernfist]

Try wrapping the nozzle head in a few layers of teflon tape?

 

[SilentScope]

Tried it just now. Unfortunately it wasn't successful

There's three suspects right now:

1. Hopup is somehow reducing fps.
2. Cylinder head nozzle too short or small bore. (I hear Laylax Type 96 Cylinder Head has a wider bore)
3. Piston is somehow causing blow-by when using higher FPS springs.

I'm considering buying a Polar Star Piston because someone told me it's wider than the piston accuracy cup + purple piston. Anyone have a clue?

 

[WorstInFinlanD]

Try other o ring first, or stretch it by putting it around something thick as the cylinder is, then heating the o ring with lighter/heat gun. For example, you can use broomstick with a few layers of tape on it.

 

[SilentScope]

Are you referring to the o-ring on the cylinder head?

 

[madhellsing]

try putting some oil on the oring and cylinder to smooth the spring action

 

[SilentScope]

The delrin o-ring on my piston is well lubricated, but still nothing. I even lubed up the o-ring on my cylinder head just for laughs and of course nothing >.

I have the red accuracy power cup for the laylax piston. Could a damaged or faulty piston w/ a functional power cup be a problem?

 

[akfortyseven]

What about telfon tape on the cylinder head?

 

[SilentScope]

Still nothing

 

[akfortyseven]

How heavy is the piston??? Maybe that could be it?

 

[SilentScope]

I can't weight it right now, but it's a PSS2 3 Element Piston. It's properly cleaned and lubed and loved.

 

[akfortyseven]

What's the cylinder like on the inside?

 

[SilentScope]

The cylinder is in great shape. I chrono'ed the gun while I still had the stock cylinder and it was shooting lower than expected as well.

I'm going to buy some new parts and if that doesn't work, it's probably something like a faulty piston. Hopefully it works :nuts:.