Author Topic: SPA M16 additional plenum... (Read 5480 times))

Atom · « **on:** March 04, 2019, 10:14:23 AM »

Additional plenum for more power...

mackeral5 · « **Reply #1 on:** March 04, 2019, 10:42:15 AM »

That is the exact type of plenum extension we need for P15's.

So far I've yet to find a source that isn't cost-prohibitive.....

CraigH · « **Reply #2 on:** March 04, 2019, 10:58:30 AM »

Very informative. I had not previously known the construction of the SPA rifle. Very nice design.

KnifeMaker · « **Reply #3 on:** March 04, 2019, 11:06:00 AM »

For such a low cost gun, they sure went at the hard/expensive way. GRRRR!!!

Wayne52 · « **Reply #4 on:** March 04, 2019, 11:09:14 AM »

I don't like the idea of having no barrel band on mine though, I'm glad that I've got the .22 because the plenum that comes stock is very sufficient for the .22

Mike pr · « **Reply #5 on:** March 04, 2019, 01:35:35 PM »

I put inside the cylinder of my P15 extra 10cc plenun, with threads at the valve side only and at the reg side seal only with oring, its easiest to take it of because it seperates
First result, same HST, same reg pressure, fps from 880 goes to 930 fps
I prefair to have constant shots out of reg to put the reg at 110 bar
Now from 230-95 bar i have 85 shots at 26.5 fpe with 12 fps spread
Also i measured the high pressure volume and it is 205 cc (factory was 235cc)

Atom · « **Reply #6 on:** March 04, 2019, 01:54:53 PM »

Quote from: Wayne52 on March 04, 2019, 11:09:14 AM

I don't like the idea of having no barrel band on mine though, I'm glad that I've got the .22 because the plenum that comes stock is very sufficient for the .22

Factory plenum is about 3 cc, this plenum is 33cc, factory regulator is set at 155 bar

...

mackeral5 · « **Reply #7 on:** March 04, 2019, 02:20:46 PM »

Quote from: Atom on March 04, 2019, 01:54:53 PM

Quote from: Wayne52 on March 04, 2019, 11:09:14 AM
I don't like the idea of having no barrel band on mine though, I'm glad that I've got the .22 because the plenum that comes stock is very sufficient for the .22
Factory plenum is about 3 cc, this plenum is 33cc, factory regulator is set at 155 bar ...

How can I order one??

MB · « **Reply #8 on:** March 04, 2019, 07:46:19 PM »

Quote from: mackeral5 on March 04, 2019, 02:20:46 PM

Quote from: Atom on March 04, 2019, 01:54:53 PM
Quote from: Wayne52 on March 04, 2019, 11:09:14 AM
I don't like the idea of having no barrel band on mine though, I'm glad that I've got the .22 because the plenum that comes stock is very sufficient for the .22
Factory plenum is about 3 cc, this plenum is 33cc, factory regulator is set at 155 bar ...

How can I order one??

Mike I have found the dealer in Russia for Artemis and have emailed, will let you know what response I get...

mackeral5 · « **Reply #9 on:** March 04, 2019, 08:07:38 PM »

Quote from: MB on March 04, 2019, 07:46:19 PM

Quote from: mackeral5 on March 04, 2019, 02:20:46 PM
Quote from: Atom on March 04, 2019, 01:54:53 PM
Quote from: Wayne52 on March 04, 2019, 11:09:14 AM
I don't like the idea of having no barrel band on mine though, I'm glad that I've got the .22 because the plenum that comes stock is very sufficient for the .22
Factory plenum is about 3 cc, this plenum is 33cc, factory regulator is set at 155 bar ...

How can I order one??

Mike I have found the dealer in Russia for Artemis and have emailed, will let you know what response I get...

Cool. That would be the holy grail p15 mod.

MB · « **Reply #10 on:** March 04, 2019, 09:00:00 PM »

yup...

Atom · « **Reply #11 on:** March 05, 2019, 02:24:27 AM »

It's expensive buy from Russia (85 eur ), should require from SPA factory that produce this parts.
Call Mrodair

miksatx · « **Reply #12 on:** March 05, 2019, 08:28:06 AM »

I just measured the cc on my .22 Airmax Dominator and I get 10cc just like the p-15. In the pic the plenum block filled to the top with 12cc syringe with 2cc left.

mackeral5 · « **Reply #13 on:** March 05, 2019, 08:48:35 AM »

Quote from: Atom on March 05, 2019, 02:24:27 AM

It's expensive buy from Russia (85 eur ), should require from SPA factory that produce this parts.
Call Mrodair

I would GLADLY pay $85 Euro if it would fit the P15. If not, someone "over there" could start making them for the P15.

Mike pr · « **Reply #14 on:** March 05, 2019, 09:19:54 AM »

][url=https://imgur.com/bB04VJV]

[/url]
I made this 10cc extra

mackeral5 · « **Reply #15 on:** March 05, 2019, 09:26:52 AM »

Quote from: miksatx on March 05, 2019, 08:28:06 AM

I just measured the cc on my .22 Airmax Dominator and I get 10cc just like the p-15. In the pic the plenum block filled to the top with 12cc syringe with 2cc left.

I figured the 3cc was a little off.

Do the P15 and the M16/Dominator have the same threads in the tube?

Atom · « **Reply #16 on:** March 05, 2019, 09:28:21 AM »

Quote from: miksatx on March 05, 2019, 08:28:06 AM

I just measured the cc on my .22 Airmax Dominator and I get 10cc just like the p-15. In the pic the plenum block filled to the top with 12cc syringe with 2cc left.

Did you compute space of regulator?

mackeral5 · « **Reply #17 on:** March 05, 2019, 09:31:10 AM »

Quote from: Mike pr on March 05, 2019, 09:19:54 AM

][url=https://imgur.com/bB04VJV][/url]
I made this 10cc extra

Very cool. I have one similar to that but it is 15cc- yielding a total plenum space of 25cc. Once installed it takes the total air storage (high pressure + plenum) to a MEASURED 220cc vs a MEASURED 230cc in OEM form. SPA claims of 265cc are a bit inflated, lol.

The design posted in this thread is what I want, it increases air storage while adding additional plenum. I don't mind the extra overall length.

Hopefully this thread will help prompt SOMEONE to make one for the P15.

miksatx · « **Reply #18 on:** March 05, 2019, 10:03:11 AM »

Quote from: Atom on March 05, 2019, 09:28:21 AM

Quote from: miksatx on March 05, 2019, 08:28:06 AM
I just measured the cc on my .22 Airmax Dominator and I get 10cc just like the p-15. In the pic the plenum block filled to the top with 12cc syringe with 2cc left.
Did you compute space of regulator?

No I put a piece of scotch tape over the regulator hole on the bottom of the regulator. The screwed the reg into the plenum blocked and filled from there to the top. Didn't add the volume of the area where the spring is seated either
From what I've read about plenum space. Is the area behind the regulator that is sealed off? Please if this is wrong someone correct me. The onboard plenum space on the Dominator is split up in 3 pieces I took my measurement from the combined two of the pieces that make up the biggest area of the plenum and screwing the reg on the two.

miksatx · « **Reply #19 on:** March 05, 2019, 12:02:31 PM »

Ok checking the spring and valve area with the other side of the valve block installed add another 4cc.

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SPA M16 additional plenum...

Author Topic: SPA M16 additional plenum... (Read 5480 times))