Airacuda updates.

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Firewalker said:
I just wanted you all to know that there is another design problem with this generation of the MAX.

View attachment 310839

This vent hole allows the hammer to strike the poppet pin, the displaced air escapes through this hole. Well... it WOULD allow the air to escape but the vent hole aligns perfectly with the stock wood buffering the vent air, causing all sorts of issues with consistency and choking speeds from the 860 FPS it shoots when the assembly is out of the stock down to 620 FPS when assembled but the FPS varies so wildly as the stock warms or cools and rises to about 750 FPS.

I went ahead and stuck my thumb over the vent hole and shot a pellet, it dropped to 300 FPS! I took the hammer spring, hammer and guide out to look at the assembly and found that indeed, it's flat walled with no air bypass on the hammer. By this time I was so annoyed that I drilled a hole through the stock, allowing the hammer to vent and allow all of the bleed air to escape.

Had I been of a cooler head, I would have run groves on the sides of the hammer (Travis, this is what needs to be done to the next gen) on the mill to bleed off the air instead.

So, if you have a MAX, you will have to either drill a hole in the stock or mill slots in the hammer to get full use of the hammer or it will be buffered on every shot but you will not know how much buffering you will get...

(Pic stolen from GTA)
View attachment 310868
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Once my blocks/spacers come in I believe I will just go ahead and drill hole. Does this hole just need to be as close as I can get to inner air vent? If I’m slightly off will it still be effective? What size hole/ drill bit do u recommend?

I really don’t like to make these modifications but I certainly appreciate all ur advice on this. Without this forum I would of probably be in the process of selling/returning gun at this point.
 
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Trueshot said:
Once my blocks/spacers come in I believe I will just go ahead and drill hole. Does this hole just need to be as close as I can get to inner air vent? If I’m slightly off will it still be effective? What size hole/ drill bit do u recommend?

I really don’t like to make these modifications but I certainly appreciate all ur advice on this. Without this forum I would of probably be in the process of selling/returning gun at this point.
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Personally .. NO HOLE
Make note on where the hole reside at the stock, how close to top edge of wood etc ...
Using a DREMEL tool and a small round burr take away some wood from the holes area making a shallow channel down to cut away area already there.

EASY PEEZY and you won't see it and more importantly NOT get debris into the vent from outside handling of the rifle !!
 
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Motorhead said:
Personally .. NO HOLE
Make note on where the hole reside at the stock, how close to top edge of wood etc ...
Using a DREMEL tool and a small round burr take away some wood from the holes area making a shallow channel down to cut away area already there.

EASY PEEZY and you won't see it and more importantly NOT get debris into the vent from outside handling of the rifle !!
Click to expand...
Great solution. I will do that I didn’t even think about the debris.
 
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Trueshot said:
Great solution. I will do that I didn’t even think about the debris.
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Agreed! Use a burr and make a channel, I was incredibly annoyed after several hours of troubleshooting the issue and drilled the hole to prove the fix. Had I been able to think clearly at the time, I would have made the channel instead.

I don't regret the decision though, I have matching stain so you wouldn't see it unless you were looking and an inlay will hide the hole.
 
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Trueshot,
If you get a chance, check out these YouTube videos; 1) Air Rifle Depinger, Pt. 2 by Air Rifle Tech and, 2) JTS Airacuda Max Reseal and Reg Repair by 45 Bravo Airguns. Today, I added a bottle brush depinger and adjusted my regulator, all based on information from these videos. My regulator, previously at 1900psi, now rests at 2100, just took a counterclockwise 1/4 turn on regulator. Picked up a dollar bottle brush and installed while air tube was off, no more ping in my ear. Was going to Dremel groove from air hole to top edge of stock but like Motorhead's idea to groove down instead. Never had to work so hard on a new gun but it's a good learning experience. WM
 
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WorriedMan said:
Trueshot,
If you get a chance, check out these YouTube videos; 1) Air Rifle Depinger, Pt. 2 by Air Rifle Tech and, 2) JTS Airacuda Max Reseal and Reg Repair by 45 Bravo Airguns. Today, I added a bottle brush depinger and adjusted my regulator, all based on information from these videos. My regulator, previously at 1900psi, now rests at 2100, just took a counterclockwise 1/4 turn on regulator. Picked up a dollar bottle brush and installed while air tube was off, no more ping in my ear. Was going to Dremel groove from air hole to top edge of stock but like Motorhead's idea to groove down instead. Never had to work so hard on a new gun but it's a good learning experience. WM
Click to expand...

The regulator is "the same" as ther DAR regulator so I am familiar with it. I do not get a ping from my MAX so I will leave it as is and the FPS is 850 with CPHP's so I'm good for now.
 
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Pulled action out of stock far enough to expose vent hole then placed tape on stock exterior to mark exact location. After fully removing stock and following tape mark down inside stock I saw a light grey circular stain caused by vented air. Dremel tool with small circular stone hollowed around then cut groove to lower stock area. Wiped everything down with oily rag. Repair not visible from outside and vented air should no longer be restricted. WM
 
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Firewalker,
With hammer spring in three turns and the regulator finally set @ 2100psi, I'm shooting JSB Exact King .25 (25.39 grain) around 880 fps. Groups are not very good; however, we'll see if freeing up the air vent improves things. My .25 has a loud ping, never noticed it until I borrowed my M3's DonnyFL moderator. The BuckRail moderator I'm using now isn't as efficient as the Donny, but for a dollar the bottle brush is an inexpensive fix. WM
 
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Firewalker said:
Agreed! Use a burr and make a channel, I was incredibly annoyed after several hours of troubleshooting the issue and drilled the hole to prove the fix. Had I been able to think clearly at the time, I would have made the channel instead.

I don't regret the decision though, I have matching stain so you wouldn't see it unless you were looking and an inlay will hide the hole.
Click to expand...
Thank you Firewalker
 
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WorriedMan said:
Trueshot,
If you get a chance, check out these YouTube videos; 1) Air Rifle Depinger, Pt. 2 by Air Rifle Tech and, 2) JTS Airacuda Max Reseal and Reg Repair by 45 Bravo Airguns. Today, I added a bottle brush depinger and adjusted my regulator, all based on information from these videos. My regulator, previously at 1900psi, now rests at 2100, just took a counterclockwise 1/4 turn on regulator. Picked up a dollar bottle brush and installed while air tube was off, no more ping in my ear. Was going to Dremel groove from air hole to top edge of stock but like Motorhead's idea to groove down instead. Never had to work so hard on a new gun but it's a good learning experience. WM
Click to expand...
I will get on this. My spacers have been shipped so this should be short term now. Can’t wait and thank you
 
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Trueshot,
Suggested 45Bravos' video so you could see stock removal as well as understanding how to adjust regulator. The Air Rifle Tech video was suggested to provide understanding of the "bottle brush" depinger, for future reference. Regulator has settled @2200psi, much better than the 1900psi set from factory. Am considering an H&N .25 Pellet Sampler to see if the Max prefers over JSB. WM
 
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With one turn in on the hammer spring and 2200psi on the regulator, tried JSB (33.95 grain and 25.39 grain), Predator Polymags (26 grain) and JSB Hades (26.54 grain), all with dismal results, only thing even close was the JSB 33.95, chrono'd @ 768fps. Bumped regulator up to 2400psi and another turn in on hammer spring for next round of testing. WM
 
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WorriedMan said:
With one turn in on the hammer spring and 2200psi on the regulator, tried JSB (33.95 grain and 25.39 grain), Predator Polymags (26 grain) and JSB Hades (26.54 grain), all with dismal results, only thing even close was the JSB 33.95, chrono'd @ 768fps. Bumped regulator up to 2400psi and another turn in on hammer spring for next round of testing. WM
Click to expand...

Check the vent yet?
 
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FYI:

DONNYFL, has " ADAPTERS " in stock for the " Airacuda Standard ".

Evanix Rainstorm / JTS Airguns 1/2 x 20 Adapter A29

Features:

Made by CNC for accuracy
Material is 6061 T6 Aluminum
Matte black anodize
Diamond pattern knurling for easy grip
Compatible with .22 to .30 cal.
JTS Airguns .22 to .25 cal.

https://donnyfl.com/products/evanix-rainstorm-1-2-x-20-unf-adapter-a29
 
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