EDgun R3 .30 caliber FIXED!!!!
I am starting a new thread so this information doesn’t get lost in the body of the other 5 page thread..
So as you know the new hammer was smashing the valve stem making it non-operational after anywhere from 100-1000 rounds My goal was to get a larger stem made in order to handle the larger hammer. John Hagan contacted me and he was willing to take on the project of making a new valve. I have been in contact with, John Hagan, Ernest Rowe and Eduard Gafarov (EDgun owner) for technical help. ( I don’t have to be smart, I just have to know the right people to contact) I had the new valve made and I couldn’t get the speed required until I fell off the regulator. My regulator was originally set from the factory at 161 bar. That was lowered to 150 bar. At the 150 bar setting I was getting an inconsistent shot string and I was having to over tension the HST.
I lowered the bar to 130 and I got a very consistent string with moderate HST tension but I could only obtain 840 FPS for 24 shots but I has an ES of 5FPS. This told me that the valve could be consistent. I contacted Ed and he suggested that I trim the top of the valve body.
This is the original 2mm valve stem (14.432 grams)
This is the new 3mm valve (15.95 grams)
I cut the valve body
With some grinding and sanding I was able to get the new valve close to the OEM weight
I got 20 shots with an ES of 9 fps
The next step is to test durability…
Eduard is going to fix your gun. He has made arrangements and I’ll let him announce how he is going to handle it. I know he has already made contact with someone and I’m sure he will announce how to fix your gun soon. Thanks Ed
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Awesome hope Ed he’s the valves made to the correct weight and sent off to John
I’m not done tuning. I think I can get 25 shots with an ES of less than 5 fps.
Very nice and you are on 130 bars. More shots on reg.
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It seems like you have this combo near maxed at 885ish, a 130bar reg setting should easy get 950fps with the 44gr JSBs with the right plenum volume and valve/ transfer port size. There should be no need for any higher reg setting than 130-135bar. Im not saying you should shoot at this speed but it should be able to do it if it was set up correctly with matching hammer springs to valve springs etc.
Something seems off and my guess is its the new rotary transfer porting size in the barrel is affecting dwell times.
My educated guess says that new brass valve will break off prematurely at the base where the stem threads in as there is not enough meat there to cope with the beating as the hammer tries to push the stem out the end of the valve. A .30cal PCP and up needs loads more meat than that which will also allow for a larger diameter valve return spring.
I know if it was my gun misbehaving Id be changing the entire valve design and going with something I know works.
I hope you get enough shots from it to call it a success Kyser 🙂