Plenum Questions

[Danman]

Since we are talking plenums.... here's a plenum question!
If i wanted to add more plenum volume to a pcp (say my Brk ghost) would the usual recommended or easiest way be; to remove the reg gauge and thread in an additional plenum chamber in the hole? Yes you'd loose the gauge but my S510 never complains without one
Just kicking the can really, If i was ever after more power for slugs....
Edit** I just reread the whole thread lol, @SpindleB answered that mostly.....seems it would be an easy thing for a machinist to make!

 

[SpindleB]

Since we are talking plenums.... here's a plenum question!
If i wanted to add more plenum volume to a pcp (say my Brk ghost) would the usual recommended or easiest way be; to remove the reg gauge and thread in an additional plenum chamber in the hole? Yes you'd loose the gauge but my S510 never complains without one
Just kicking the can really, If i was ever after more power for slugs....
Edit** I just reread the whole thread lol, @SpindleB answered that mostly.....seems it would be an easy thing for a machinist to make!

Not even a little familiar with ghosts but if you can add a regulator at the bottle you can remove the internal regulator. That space then becomes plenum. If you use one of the Huben Power Regulators with plenum then your plenum space will be 20 or 50cc bigger.

 

[Danman]

Not even a little familiar with ghosts but if you can add a regulator at the bottle you can remove the internal regulator. That space then becomes plenum. If you use one of the Huben Power Regulators with plenum then your plenum space will be 20 or 50cc bigger.

Hmm never even thought of that.....Lol, that would be a MASSIVE plenum then! The bottle would stick pretty far out but with a 700mm slug barrel should be fine. The ghost chassis is one solid block of aluminum with the tail portion bolted in back to house hammer spring, H.S. adjuster, etc....great design really, think Impact M3 but built like a tank and less adjustments.
I know the ghost bottle threading is normal (M18× 1.5) but valve threads are odd iirc.

 

[SpindleB]

Hmm never even thought of that.....Lol, that would be a MASSIVE plenum then! The bottle would stick pretty far out but with a 700mm slug barrel should be fine. The ghost chassis is one solid block of aluminum with the tail portion bolted in back to house hammer spring, H.S. adjuster, etc....great design really, think Impact M3 but built like a tank and less adjustments.
I know the ghost bottle threading is normal (M18× 1.5) but valve threads are odd iirc.

The bottle threads on the gun or an adapter that screws on the gun like FX?

 

[Danman]

The bottle threads on the gun or an adapter that screws on the gun like FX?

Bottle threads to adapter (valve) and adapter to gun... very similar looking to the FX but not interchangeable via brk used wierd threads. HumaAir has a fitting out now that threads onto the valve and you can fill your bottle off the gun (Nice if you had a spare).
Pic of Brk one.

 

[PG1 Airgunner]

I have been experimenting with the additional plenum equation here recently on a pair of FX Dreamlines. I built both of them with the FX Tactical conversion kits and added FX bottle adapters to them.
Both are 25 Cal, with 600mm barrels.
I removed the Dreamline standard plenum and added a blank plenum module that is used on the FX Mavericks and Wildcats. It replaced the smaller 24 or 28cc plenum with an 89cc plenum. By taking iut the 220cc air tube and replacing it with a 580cc bottle I have a lot of power and air available.
I have been running FX 25.4 gr pellets with the reg set at 100bar, hammer wheel set to 6

Power wheel set to: .25-.30 (high)
&
Avg Kinetic energy : 50 ft lbs
@
Average fps: 941.8

I still have a lot of hammer and regualtor space to work with but this is my initial tuning.

 

[Grunt64]

I have been experimenting with the additional plenum equation here recently on a pair of FX Dreamlines. I built both of them with the FX Tactical conversion kits and added FX bottle adapters to them.
Both are 25 Cal, with 600mm barrels.
I removed the Dreamline standard plenum and added a blank plenum module that is used on the FX Mavericks and Wildcats. It replaced the smaller 24 or 28cc plenum with an 89cc plenum. By taking iut the 220cc air tube and replacing it with a 580cc bottle I have a lot of power and air available.
I have been running FX 25.4 gr pellets with the reg set at 100bar, hammer wheel set to 6

Power wheel set to: .25-.30 (high)
&
Avg Kinetic energy : 50 ft lbs
@
Average fps: 941.8

I still have a lot of hammer and regualtor space to work with but this is my initial tuning.

Nice work, PG1.That’s a clean setup and solid numbers for an initial tune.I really like seeing someone lay out the plenum changes and the results without overcomplicating it.Looking forward to what you find as you open up the reg and hammer a bit more

 

[PG1 Airgunner]

Nice work, PG1.That’s a clean setup and solid numbers for an initial tune.I really like seeing someone lay out the plenum changes and the results without overcomplicating it.Looking forward to what you find as you open up the reg and hammer a bit more

I felt like this was using too much air but I havent had a chance to get back to it yet. Compared to one of my airtube dreamlines these are giving me a lot more play with the regulator and hammer settings
This is my second setup with an FDE look.
I think this one has a leaking valve pin though so I will tear it down soon and replace it..just got those parts in yesterday. I also had to borrow the 25 cal probe out of this gun for another one and I just got a replacement for this gun yesterday as well…fun times