Footloose said:

just for fun I just bought a cheep Beeman Commander .22 cost around $240 It has a surprisingly nice stock I shot It for the first time today , using AEA 18g pellets at 900 fps out to 65 yards and got this group , then I shot my Impact same pellets same distance So I sat there for a minute and thought wow that group Is as good as my MK4 Impact that cost ( with extras ) around 3K . I don't hunt, I bench rest most of the time , so I'm thinking why am I spending all this money on high end guns when a gun at a fraction of the cost shoots just as well . yes the Beeman Is not a refined as the Impact but It's the end result that counts right ?
View attachment 563157View attachment 563158View attachment 563159View attachment 563160

Click to expand...

Ratzy said:

I figured it out. Added a U adapter and 20CM long 125CC tube.
The 40CM 250 CC tube runs along the body of the gun with the top hat in the middle. Extension, U adapter and joints add about 50CC.

Now i just have to drive 500 miles to test it...

View attachment 563221
Regulated big bore needs a big bottle, so 1.1LView attachment 563220

Click to expand...

inverted said:

You guys were right, oil level was a bit high but not by much.
When I poured new oil in few months back it was really cold so it was settling slower than I thought. I'm always careful about this things but obviously got it wrong this time.
But, this was a new oil after rebuild with maybe 10 minutes of work time and colour is worse than the old oil which I've changed after 2.5 hours of work time.

I'm using Bauer diving compressor oil so oil itself is not an issue.

Everything is still the same even after lowering the oil level. It still blows blue smoke out of the breather.
Mind you, there's not a lot of smoke and it's visible only when I point a flash light at it, under normal workshop lighting it's not visible so I may have this problem for longer than I think I do.
I have topped up my 6.8L bottle two times this week from 260-270 bar up to 300 bar without any issues.
But, there is evidently a problem and potential bigger malfunction waiting to happen.

In any case, after two cylinder rebuilds, there's no point in rebuilding them for the third time. I'll buy both new cylinders with all the parts and change them completely.

Only question is when, my spring vacation is over, little free time that I have on my hands I spend rebuilding my lathe which won't be finished any time soon.

Click to expand...

Ratzy said:

I've been playing with plenums for a few months now and a friend with a .510 Texan asked if it is possible to regulate with a large plenum.

I did the math and a .510 with a 34 inch barrel has a volume of 114cc. Optimal plenum would be 3x or 4x barrel volume.
350-450cc would be a good starting point.

Turns out the best I have available is a 40cmx28mm tube which is about 250cc.
I built it up and tested it on a .25 Condor with a 24 inch barrel, high flow valve and heavy hammer. It was impressive. Regulator set to 1500psi and I was getting almost 900FPS with Barracuda 30.86gr pellets.

Don't know when I'll get to try it on the Texan (500 miles away) but if I change out the regulator to a Huben Max-ATH it will add 50cc to 300cc it should work pretty well.

Was able to run the 40CM tube along the body of the Condor. It is possible to add more tubes either in parallel or a 20CM tube in series. Parallel would add another Tee to the arrangement.

All done with COTS parts except two custom M18 male to male adapters.
Shan Bao 40CM tube with M18 adapters
M18 F-F-F Tee
M18 M-F Elbow
M18 plug
2 custom M18 M-M adapters
Regulator of choice
Bottle - 1.1L Acecare Fat

The fun part getting it clocked and tight.
Various thickness PTFE 16mm washers, 1mm, 2mm and 3mm
16mm bonded washers.

Whole thing weighs right at 5lbs.

Big issue right now, the 40CM tube is unavailable on AliExpress due to tariff fun and games. Hopefully it will be back during the current hiatus.

View attachment 563104

Click to expand...

Ratzy said:

See if i can add more volume to a 300CC plenum set up. Trying to get enough volume a friend can regulate a .510 Texan.
Need 350-450CC minimum
.510 barrel volume is 114 CC
(3 x 114) = 342cc
4 is probably better

Click to expand...

Bandito said:

That's a marvelous group offhand. BUT YOU MISSED THE SILVER DIME! Be Well Brother, B.

Click to expand...