Vulcan mods to make the hammer/spring assembly consistent.
This mods were performed on Zonk .22 Vulcan. his issue was sudden change in pellet speed.
in my testing —–> it was consistent for 5-12 shots or so around 900fps then drop down to 840fps for about 2 to 6 shots then back up to 900fps keeps doing this for 4 fill and can’t complete a string without the speed dropping to 840fps.
So the 1st thing I did was tuned the reg down to 120b with some polishing and better orings, didn’t see anything wrong with the reg during dissemble.
When testing the tuned reg I still see the speed drop in every fill. So I know now it’s in the hammer assembly so heres the mods I done in the photo:
1. In the middle of the hammer spring there is no spring guide so the spring flex where less resistant (rainbow) so the spring end at the HSTA rub on the threads in the action for the HSTA. to prevent the spring drag I sanded and polish the coils that’s making contact with the action threads and that also was sanded and polish.
2.The hammer was given a high polish for less friction.
3. The brass bushing for the hammer spring has an edge that side in the hammer chamber—- sense the hammer has a loose clearance that edge hits the action 1st at times that prevent the full travel of the hammer spring—the fix I reduce the OD.
4. after the hammer open the fire valve it will slam back at the brass bushing guide so to prevent metallic noise and still have a clearance for a de bouncing device (hammer is free floating so the hammer isn’t pressing on the VS when uncock) i installed a nylon slim.
here is a photo of a delrine spring retainer with a longer spring guied to replace the brass spring retainer and hopefully will keep the hammer spring from binding out ward so the back end of the spring from rubbing on the threads and reduce the impact noise.
if you want one contact John.
After all this mods I got her shooting consistently after 200+ rounds here are 3 shot string with the reg set a 120b. with 18.1g pellet.
pressure 205b to 105b
String #1 string #2 string #3
#shots 65 65 62
high: 900fps 907fps 902fps
low: 892fps 895fps 895fps
ES: 8fps 12fps 7fps
Not every Vulcan will have this issue but some useful info for others.
All Replies
I just won´t have that !! I´m a bigger liar than Zonkey, damn it !! :angrymob:
Especially waist down …
No one lies more the Lead Nutz but Zonk and h00t who taught him.
And gas……
I just sent mine back, what’s another 3 weeks with out it…..
Are you full of beans Zonk
Sent from my Z30 using Tapatalk
It was only firs impression. :confusedn: Nothing is perfect 😉
I just sent mine back, what’s another 3 weeks with out it…..
I’m having an air leak and offered to send mine in, I would like the Ernest Rowe once over. I PM’d him earlier this week but haven’t heard back yet. He also makes some killer jewelry. You guys should look into it for your next anniversary!
Some body send Ernest a Vulcan to tune fast! 😯
when you have the time, can you please make a video on this mod.
Your videos are good info, & people get alot from them.
I’m still not sure how to do this mod.
Thx. 
Sure, when I get another Vulcan to tune!
Ernest,
when you have the time, can you please make a video on this mod.
Your videos are good info, & people get alot from them.
I’m still not sure how to do this mod.
Thx.
I would think that Delrin will squash like a bug. ….
I think your better off making an alluminum spacer with tighter tolerances out of 7075… then swiss cheese it….
What’s the ID of the airtube and the od of the spacer…..
Maybe make one that is a little closer in tolerance. Maybe even give you a little more reg chamber
Zonk Vulcan ship al ready , so the next one I’ll cut 2 Oring groove so it will be a de pinger for the AT also
Suppose we make the air chamber spacer out of say a slightly shorter length of UHMW or Delrin and increase it’s volume by means of holes and/or making it’s wall thinner. This would give the same volume as the stock spacer, but allow slightly more air tube volume for an increased shot count. The non-metallic material may absorb/reduce the pinging tone as well. Just a thought, and I will be trying this the first time I feel like getting into my Vulcan’s air tube. 💡
You clearly found a solution to the Vulcan’s ping, which is the worst complaint people have about the Vulcan (says something, doesn’t it).
That’s awesome!
My big question: Is fixing the ping something the average Joe could do?
I’ve never had any of my airguns apart and I have never owned a regulated airgun, so your instructions in the above quotes are not very intuitive to me.
Do I need a special tool to remove the regulator (it seemed so in SniperQTY’s recent Youtube video)?
Will it be obvious what size o-ring I need to add, where to add it, and how to apply the electrical tape to the spacer?
Look, I’m OK with sending my Vulcan to you and have you do it all, but I would like to avoid the downtime in my shooting. Moreover, if you have fix instructions that ANYONE with a pinging Vulcan can follow, that would make you an even bigger hero than you are already with Vulcan owners.
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:rofl: