Author Topic: Bulldog modification log .328 porting and more (Read 39813 times - 1 votes)
)

PCPhack · « **Reply #80 on:** September 24, 2018, 09:43:21 PM »

Quote from: YEMX on September 24, 2018, 09:24:00 PM

If the Pitbull LDC doesn't work out, maybe give DonnyFL's LDC adapter for the Bulldog a try. This way, you can have a thread on/off LDC of any size made...

That is what I have been using prior to getting the Pitbull moderator.

YEMX · « **Reply #81 on:** September 25, 2018, 08:18:49 AM »

Ahhh... okay. I should have re-read the past posts! $:-\$

Travis: If you make those Titanium reservoirs available, will you be offering them in extended, factory, or custom length? Also, would they be using the airbow type filler or using the standard fill port? Would the end cap also be Titanium, or would we be re-using factory end caps? Not trying to hijack- I'm sure PCPhack would be interested in the info too!!

rsterne · « **Reply #82 on:** September 25, 2018, 02:28:34 PM »

If the tube is larger, you can't use factory end caps....

Bob

PCPhack · « **Reply #83 on:** September 25, 2018, 02:56:45 PM »

No no no. Same diameter tube, different length. Either end cap can be used (airbow or bulldog) except I have read they have different threading. I have both end caps, so could verify that. I would prefer the airbow because then I can still add a regulator (as then it needs to be filled from the end).

oldpro · « **Reply #84 on:** September 25, 2018, 02:57:10 PM »

Quote from: YEMX on September 25, 2018, 08:18:49 AM

Ahhh... okay. I should have re-read the past posts! $:-\$

Travis: If you make those Titanium reservoirs available, will you be offering them in extended, factory, or custom length? Also, would they be using the airbow type filler or using the standard fill port? Would the end cap also be Titanium, or would we be re-using factory end caps? Not trying to hijack- I'm sure PCPhack would be interested in the info too!!

Complete custom set up no factory parts and rated at 4500 PSI more on it after I get material and some base testing done. Will have options on length and fill location.

PCPhack · « **Reply #85 on:** September 25, 2018, 02:58:38 PM »

Quote from: oldpro on September 25, 2018, 02:57:10 PM

Quote from: YEMX on September 25, 2018, 08:18:49 AM
Ahhh... okay. I should have re-read the past posts! $:-\$

Travis: If you make those Titanium reservoirs available, will you be offering them in extended, factory, or custom length? Also, would they be using the airbow type filler or using the standard fill port? Would the end cap also be Titanium, or would we be re-using factory end caps? Not trying to hijack- I'm sure PCPhack would be interested in the info too!!
Complete custom set up no factory parts and rated at 4500 PSI more on it after I get material and some base testing done.

Thanks Travis. I want to be first.

Cash in hand.

oldpro · « **Reply #86 on:** September 25, 2018, 03:00:54 PM »

Quote from: PCPhack on September 25, 2018, 02:58:38 PM

Quote from: oldpro on September 25, 2018, 02:57:10 PM
Quote from: YEMX on September 25, 2018, 08:18:49 AM
Ahhh... okay. I should have re-read the past posts! $:-\$

Travis: If you make those Titanium reservoirs available, will you be offering them in extended, factory, or custom length? Also, would they be using the airbow type filler or using the standard fill port? Would the end cap also be Titanium, or would we be re-using factory end caps? Not trying to hijack- I'm sure PCPhack would be interested in the info too!!
Complete custom set up no factory parts and rated at 4500 PSI more on it after I get material and some base testing done.

Thanks Travis. I want to be first. Cash in hand.

I promise you will be David.

PCPhack · « **Reply #87 on:** September 25, 2018, 04:01:25 PM »

Thanks Travis! Please see the thread in the JSAR subforum. I am getting stiction after it sits a while.

MJP · « **Reply #88 on:** September 25, 2018, 04:01:45 PM »

David,
How did you fill the rifle from behind the blast shield?
Over filling is a fools errand, but going over that much I can't say how sad it makes me to read this in a public forum.
" oh oh I saw this one guy in this forum filling his ag to silly pressures and nothing happend..."
One bad section of tubing, too loose thread tolerance missed by the QC it takes only one mistake.

If it's not you, what about if the tube shoots through a door killing your kid or wife?
What more can I say.

Marko

PCPhack · « **Reply #89 on:** September 25, 2018, 04:07:57 PM »

With a hose, how do you think? I do not test things in an unsafe way, or where any individuals would be at risk. If someone else is not following safe protocols, then it is their error. I have been working with compressed gas for over 20 years and am no idiot, thanks.

rsterne · « **Reply #90 on:** September 25, 2018, 04:18:47 PM »

Marko, I haven't been following this thread on a daily basis, but I must agree with you.... Regardless of the precautions David has taken, filling a tube designed for 3000 psi to 40% more than that is something that should not be posted on any public Forum.... JMHO....

Bob

PCPhack · « **Reply #91 on:** September 25, 2018, 04:24:58 PM »

Yet it has sparked discussion, potentiated a titanium product option, and perhaps educated some. I would agree, the practice outside of confined tests is not be encouraged, obviously. However, I strongly disagree that information and education should be hidden or not discussed. There seems to be no issue to show a test video, for example, of testing something to failure, and yet then discussion of material limits should be discouraged?

rsterne · « **Reply #92 on:** September 25, 2018, 04:28:43 PM »

There is a HUGE difference between Hydrotesting an oil-filled tube to failure to know where that point is, or shear-testing valve screws using an hydraulic press.... and overfilling a reservoir with air, which when compressed stores such HUGE amounts of energy....

You say you have worked with compressed gasses for over 20 years?.... then you should know better....

Bob

MJP · « **Reply #93 on:** September 25, 2018, 04:30:55 PM »

Bob was faster to type what I was about to...

PCPhack · « **Reply #94 on:** September 25, 2018, 04:37:07 PM »

The smugness is palpable. It was just an example, and you well know that in industry all manner of tests are performed. This is entirely different from what day to day operation or usage ranges of a product will be. When I use my Bulldog that is for hunting, it sees no more than 3k psi. I have nothing more to say on this topic, and will remain an advocate for safe practices within accepted engineering safety parameters.

Rocker1 · « **Reply #95 on:** September 26, 2018, 07:27:33 AM »

My man just because you got away with it doesn't mean someone else can, this forum will not let any unsafe use of a airgun, this thread is locked until I get time to edit it. David

PCPhack · « **Reply #96 on:** October 11, 2018, 09:22:33 PM »

I have now tuned the Bulldog for 2 shots at 250 FPE, and then slowly down from there. I have overcome most of the stiction by switching to a .015 jet on the JSAR valve, and using the factory hammer spring with a little over 2 loops cut off. This is with the factory air tube. The Pitbull air reservoir had a slightly non-squared end thay was blowing orings, so I took it off. The replacement arrived today, but it will have to go on next week, as we are hunting Friday night and Saturday morning.

The replacement Pitbull moderator solved my POI scope zeroing issue, and I even put the barrel supports back in.

I have also figured out that the rifle groups much better if I run 4 to 5 cleaning swabs through the barrel after approximately every 20 shots. It is now grouping around .75 inches at 75 yards somewhat consistently using custom NSA 130gr slugs (their 142 gr, only slightly lighter). Perhaps I will try to fire lap the barrel next.

PCPhack · « **Reply #97 on:** October 12, 2018, 11:22:11 PM »

First hunt success (NSFW) can be found here:

https://www.gatewaytoairguns.org/GTA/index.php?topic=149485.msg1525504#msg1525504

PCPhack · « **Reply #98 on:** October 17, 2018, 09:47:21 PM »

Though I am having excellent success with the NSA 130gr slugs, I have ordered some 165gr MrHollowpoint slugs, and will test them with the higher power tune (300+ FPE), along with 178gr NSA slugs (single loaded). I also have the replacement Pitbull air tube in hand, so will put that on while retuning. I can always come back to the existing tune, if accuracy is an issue. Stay tuned.

Ironman482 · « **Reply #99 on:** October 20, 2018, 05:21:18 PM »

I have a question for you david, my JSA bulldog vavle is not sealing after one shot, sounds like its burping or bouncing , I've talked to travis and he said to blow through the holes in the poppet stem to clear it , tried that didn't help, whats weird is it worked fine for about 50 shots while testing diff. Ammo, you stated yours was sticking earlier and you changed the jet in the valve, where did you find those jets , are they common carb jets?

Thank you to our advertisers!

Bulldog modification log .328 porting and more

Author Topic: Bulldog modification log .328 porting and more (Read 39813 times - 1 votes) )

Author Topic: Bulldog modification log .328 porting and more (Read 39813 times - 1 votes)
)