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Old May 10th, 2009, 12:57   #31
AngelusNex
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Quote:
Originally Posted by grimreefer View Post
So which method is the proper way to do a compression test? Pushing the nozzle back into the assembled mechbox? Or pushing the piston forward with your compression parts outside the mechbox?

Can you still have a good airseal and be able to push the nozzle back into your assembled mechbox?
the piston pushing is better for testing the piston's/cylinder heads compression. The assembled mech box test is better for testing the nozzles compression.
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Old May 10th, 2009, 13:02   #32
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Originally Posted by Sepulcrum View Post
the piston pushing is better for testing the piston's/cylinder heads compression. The assembled mech box test is better for testing the nozzles compression.
Well when I do the piston push, there is a slow air leak around the nozzle...like so slow I wasn't sure if it would matter. But when I do the nozzle push, I can push it all the way back...fairly easily. I tried soaking the nozzle's o-ring in silicone oil but didn't help much.
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Old May 10th, 2009, 13:10   #33
AngelusNex
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Quote:
Originally Posted by grimreefer View Post
Well when I do the piston push, there is a slow air leak around the nozzle...like so slow I wasn't sure if it would matter. But when I do the nozzle push, I can push it all the way back...fairly easily. I tried soaking the nozzle's o-ring in silicone oil but didn't help much.
Try the out of box method without the nozzel. If that is a perfect seal then your nozzle is leaking. THOUGH it may be only a little and only drop your gun 10-20 fps.
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Old May 10th, 2009, 13:22   #34
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Originally Posted by Sepulcrum View Post
Try the out of box method without the nozzel. If that is a perfect seal then your nozzle is leaking. THOUGH it may be only a little and only drop your gun 10-20 fps.
Yeah, without the nozzle I get a good seal. Could it be that the grease I'm using is too thin? It's the G&P cylinder grease...a liquid.

The nozzle and cylinder head are both modify...and have only seen maybe 2000 rounds. Tried expanding the o-ring in silicone oil but no luck.
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Old May 10th, 2009, 13:43   #35
AngelusNex
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Quote:
Originally Posted by grimreefer View Post
Yeah, without the nozzle I get a good seal. Could it be that the grease I'm using is too thin? It's the G&P cylinder grease...a liquid.

The nozzle and cylinder head are both modify...and have only seen maybe 2000 rounds. Tried expanding the o-ring in silicone oil but no luck.
Well Like I said, it MAY only be a small power drop. Beyond that All I can say is either get a new nozzle or play with different orings. (I'm much more handy hands on)
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