Further powered-down Cricket – UPDATED 7/20/2015 (320 SHOTS)
I turned down the power further on my Cricket to 10 FPE and did some chrono work today to check the results of my regulator and hammer spring setting shooting JSB 16-grainers. I don’t know what the regulator BAR setting is set to as I don’t have a reg-tester. Anyway, the starting fill pressure was 210 BAR. The pressure after the last shot was 165 BAR. I stopped on shot number 70 because I ran out of pellets. 😥 I wanted to see if there was going to be any reg-creep after letting my Cricket sit overnight; when the gun was set to 12 FPE the first shot would be around 30-40 FPS higher than the average if I let the gun sit overnight. I attribute it to incorrect HST setting. It looks like at the current setting, I am not getting too much creep (or maybe none at all judging by the string). At any rate, I’ll continue where I left off on the chrono work once I’ve restocked on pellets to see how many more shots I can get while maintaining a 15 FPS extreme spread. Anyway, here’s the data plotted on an Excel spreadsheet I created. What do you guys think?
Just for kicks, while chronying I decided to shoot the LED bulb out of this mini flashlight.
The flashlight set on my target box at 27 yards.
The end-result.
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http://talonairgun.com/forum/viewtopic.php?f=33&t=32138&p=334388#p334388
here Is the thread that I posted in frustration about adjusting my fps.
It also includs the power mods that help with efficiency.
My reg does not have an extra washer and from what I know that set up is only for the .25 at 40 fpe and higher! I would remove the extra washer and polish all internals, then talk to ernest about his general measurements on the reg. Length and valve spring depth to match the fps/fpe that you aim for. But from what I have learned is you want your hammer spring tension at its peak fps, then you want to adjust your valve and reg to match your aimed fps. Its alot of work but you wont regret it. My numbers ar as follows; hammer spring set to when it will not adjust the fps any higher, valve spring is set to 2 turns after contact or .230 of an inch, and reg length is 53.40. But with a .22 your numbers are going to be smaller then mine.
Chad, I didn’t do any work on my Cricket’s regulator except adjust the delrin seat. I did open it though and cleaned out the internals; I wiped off some of the grease on the belville springs, internal walls, and piston. I also changed the piston’s top and bottom O-ring. I noticed that I have an extra belville spring as the stack looks like this: (())(())(())(())). Is this stack similar to yours? I left the extra one in though. I’ll try to do what you did to yours the next time I get into the reg.
I’ve read that the regulator works better at higher pressures, however I am after lots of shots. I would get 140+ shots from 210 BAR to around 50-60 BAR when it was set to 12 FPE and want to see how many I can get at 10 FPE.
Yeah, the brass seal nut was loose when I inspected it. I’m afraid to Loctice the brass nut though because I think it will be difficult to unscrew if I need to do so in the future. Plus, brass is soft and the indentation (for a screwdriver) is too shallow. Maybe PTFE tape might be an alternative.
Hey spin! Have you done any work on you regulator? Other then just adjusting it? Becuase my .25, has an extreme spread of 10 fps and a standard deviation of 1, at an average fps of 910 and 36 shots from 185 bar to 97 bar. Polish everything on the inside of your reg. Polish Spring washers inside ring outside ring and flat surfaces make sure to round all sharp edges. Polish the spring guide including nozzle tip. And last polish the delrin mating surface. Also make sure that the brass seal nut on the inside is tight and lock tighted in because it will move.
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At what distances are you shooting (max distance)?
the reason I ask is because if you are not going over 30 yards then it does not matter what your fps is but if you are shooting from 50-150 (max) you need to set your gun to its most accurate fps. Which for .22 is around low to high 800s and for .177 is around mid 500s to mid 800s. Competition .177 shooters stay around mid 500s.