The LP BBT Tribal

[Theguy]

Well this mod came as inspiration because my air efficiency was shot to hell.

1000psi off a hopper from an 88ci tank is horrible.

So I decided there must be a way to lower my pressure and keep the valve open longer. 2 options, drmatically increase my dwell, which is already at 14ms. Or, modify the spring to need less force to open the valve.


Well you can guess which one I did. I took the old velocity screw from a spyder, and clipped it a little longer than the old spring. Heated it over the stove to flatten out that last turn so It would sit flat on my TILPR. Flahs cooled it in water to harden the metal.

So far I have the TILPR as low as it will go without cutting off air totally, and my HPR is under 150psi, and it still seems to be shooting hot. I will probly have to turn down my dwell to get the velocity down. But I shot about 400 shots off my last 300psi.

I will need to refill tomorrow at work. Since I only have access to a chrono at the field.

[bakerboy4679]

What does "Flahs" mean? :o

Thats awsome.. I'm sure it's fairly quiet as well, eh?

[Edwin]

So the only thing you did was change the valve spring?

[bakerboy4679]

Thats what it sounds like, besides turning the pressure down that is. :Smile:

[Theguy]

Flahs is a technical term, look it up. :Burp:


Yes, all I technically did was replace the spring. Its not as consistent as it used to be, but I can fill up every 3 games, instead of after every one.

Now if I can just get my eyes installed so every 3rd shot didn't chop...

Shouldn;t a 17bps cap be adequate for a reloader b?

[bakerboy4679]

Your chopping now with a reloader b??

When I put my B on my 2.0, on auto-response, it never chopped.
even when it double/triple/and sometimes even quadruple fed(crappy TT ball detent), it still wouldnt chop..

[Edwin]

What are the specs of the marker, as you may have a HPR that is spiking!!!

I never owned a Tribal that would chop that bad, and the one Tribal I messed with (that did chop that bad) had a damaged Stock HPR that could not be fixed. A vigilante fixed that problem.

[Theguy]

my old stock reg used to spike, err leak and put 800 psi slowly to the valve.

BBT, Mini-morlock, TILPR, CP HPR, BKO Frame, Whitedog Tub, CP barrel.

Tried changing barrels, not the problem. Spiking HPR sounds like it might fit, although its gotta be the 3rd reg I've tried on this gun.

I never had any paint in the breech until the very last game, after chopping that badly (and getting bunekred trying to fix it), I have paint in my hopper, barrel, breech, bolt, and ram (yes INSIDE the ram).


I also noticed that my valve set screw had backed itself out. (probly the main reason). I figure the valve was probly spinning in the body or something, but the screw wasn;t out enough for the valve to mvoe at all.

Either way, I'm still not putting in eyes until I find eye covers.

*edit* did I mention I did chrono it with no hot shots... , and usually when it chopped it was single shots, strings went fine, until that last game.

[Theguy]

Any ideas, guys?

[bakerboy4679]

Your running at such a low pressure.. I'm supprised it ever chops.. ever. My stock tribals didnt even chop...

Anyway, I'd say just try a different barrel. It sounds like your reg is fine(over the chrono wit no hotshots).
Then just check your feedneck/breech area.. make sure theres no nicks or anything.. then run over your barrel with your finger.

just inspect everything, make sure it's all nice and smooth.


Thats all I got for ya. :Wink10:

[warpedmephisto]

Make sure that your ram has a buffer on it as that can solve any roll back issues that might be causing the chopping. Look down in the breech and you should just barely see the tip of the bolt sticking into the breech. Also make sure your detent is good as that can cause a ball to overload and the next one to half load, thus causing a chop.

[Theguy]

my bolt might be too far back, but if I put a buffer on my ram, then it leaks.

I tried more than one barrel on my gun, to no avail. The pressure I have my LPR at, it takes a good amount of force to move the bolt. I had to turn the LPR up to get the velocity up. Otherwise I would be back to working at a higher pressure. I need to dink around with my dwell and stuff a bit more i guess.

[warpedmephisto]

Hmm... is the ram shaft scratched severely? That could cause a leak. Check that and the o-ring in the front portion of the ram body. Also check your detent.

[Theguy]

it only leaked when I had the buffer in.

*edit* my ram is polished

[Theguy]

ah, possible culprit identified, I somehow managed to set my dwell to 6ms.

[warpedmephisto]

That wouldn't affect the ram leaking nor the chopping problems.

[Theguy]

well like I said before, the ram only leaks when I put a buffer on the shaft.

The back buffer works fine, the pin doesn;t strike the slot. I unscrewed the hammer 1-2 turns and that brought the very tip of the bolt into view in the feedneck.

I reassembled the whole gun today, greased and oiled everything. I turned my dwell back up where I wanted it, and I will turn down the LPR and chrono it a different day. since I only have chrono access on days I work.

[TheTramp]

Wouldn't you want a lower dwell with a bit higher HPR for good efficency?

[warpedmephisto]

That was kinda my thoughts as well. Also make sure that that hammer doesn't come all the way unscrewed as that can cause some major problems for you (stripped hammer/ram shaft). You might want to use a bit of loctite or do the hammer lock screw idea.

[Theguy]

already did the loc-tite, one step ahead of you.

[bakerboy4679]

Theguy, as Thetramp was touching on, try setting your dwell up(if you havent already).

I'd say since your running so low, try even the 18ms setting. ?.

[Theguy]

and step ahead of you too. 6ms was an accident, probly me changing registers by accident.

now it just boils down to me getting a chance to chrono the gun and check it again.