Best Air Sealing Components

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I currently have a Prometheus Aero Cylinder Head, Air Seal Nozzle, Aluminum Piston Head and Stainless Hard Cylinder. I'm not getting really good compression from the air seal nozzle when I do a compression test. I've heard from other ASC members that Modify components are really good at sealing air. Should I just get a Modify Air Seal Nozzle then or should I also get the Modify Cylinder Head, Cylinder and Piston Head as well?

[Rotting]

Just based on general knowledge, if you're going to go with a company's parts, try to stick with that company as much as you can. Obviously this means you may not get the best parts of the category, but the standard deviations of parts can cause a huge problem, depening. As far as air seal goes, a slight change in the part not normally noticable by human eyes, I'd think could cause a major problem. IE: The air seal nozzles that Modify markets and the Cylinder head that Prometheus make may not agree with each other.

It'd be like asking Honda to make parts for Chrysler. Sure, the part may be roughly the same, but the minor difference from the press molds may cause slight misfortunes. If you end up switching to a modify air seal nozzle, I'd highly suggest considering switching out your cylinder and piston heads and cylinder as well for modify-branded parts.

[F34N0R]

I personnaly use Systema silent head set + Modify electrolized cylinder.

Roko comments is fairly good.

Before switching to modify components. I you suggest you trying to lube piston head o-ring and cylinder head o-rings too. Stretch piston head o-ring with your fingers. And try Compression test by hand. I would recommend you to change your piston o-ring if first method doesnt work. Go to canadian tire or any hardware store, buy 1 o-ring about same size than piston o-ring (in plumbing section). It cost not even a buck and fix your problem.

[Alexei]

Hey guys how do you do a compression test?

[dpvu]

You stick your finger over the nozzle and try to push it back into the mechbox. You shouldn't be able to move it much at all if you're getting a good seal.