bulk co2 ?? self regulating ?//? any help appreciated-co2 masters

[rsterne]

You WILL need more preload.... If your velocity is then too high, THEN reduce the transfer port diameter....

Bob

[kj]

kj
You are picking up speed as the gas temp drops. So to even things out my guess would be a bit more spring in the striker. I really doubt that you need the extra volume of a boss valve, I'd go with a Disco valve and if possible lighten the striker a bit. Are you using a hard stem, or a soft one? The hardest one that will seal would be best for you.

hi anthony, the boss valve has a disco stem ...i think. i'm not sure on that though.  i have disco valve stems on hand though. and disco valve. i have plenty room left to increase pre=load, and or change the throw. the hammer i'm using is the p-rod hammer/striker set-up, same one in the challenger.

so if i up the pre-load and start at a higher fps do you think it will even out ? i'll try switching out the valve to the disco valve. and open up the boss valve and see what stem it has. i thinjk this boss valve will be great for my .25's though..lol

what about the ping sound ? sounds almost like a spring vibrating or something ?

have nice day
kj

kj, pretty much all of my rifles "Ping" The only one that might not is the alum tube Disco with the Don Cothran valve.
As far as the striker weight goes, I'm pretty sure the P'rod with the hammer installed weighs just about the same as the oem 2240 +- 58g. Another thing to note is if you are using that factory hammer/stroke adjuster, even with it backed out to where it is flush against the striker face you will loose about .060" of stroke if you use a standard length Disco stem. I use those strikers but I use a 1/4x28 allen set screw with the face ground flat for the stroke adjustment. To further lighten them I also bore them and use a Delrin insert to bring the I.D. back to size. My thoughts for you..the smaller Disco valve and stem, standard stroke, and a bit more spring pre-load. And if at all possible see if you can get the striker down to 50g or less. That will kill some of the dwell time.

thanks again anothony for your input. i'll definitely switch out the valve and increase pre-load like you and bob said . i  also have another valve option. it's a smaller hole front of the valve that screws onto a regular 2240 valve. i think i'll try the disco valve first. i'm also going to try to make a smaller transfer port that bob mentioned. but i'll try the other things first. i gotta wiegh that hammer. i don't have any delrin here and don't know where to get it .  getting/finding things here is alot different than back in the states...3rd world living..lol/  i could shave the sides some and drill some cross holes.   wouldn't lessening the throw have a similar effect as lightening the hammer ?

peace
kj

[kj]

You WILL need more preload.... If your velocity is then too high, THEN reduce the transfer port diameter....

Bob

ok, i wasn't sure on the port reduction and increased pre-load. i think i'll give these ideas a go here soon as i get a cup of coffee in me and wake up a bit. i appreciate your advise. i had it tuned easy with the 12gr cartridges, but this is alot different and new to me.

thanks again, have nice evening
kj

[plinker81366]

kevin we have delrin lol, but i think some co2 users also make use of chopping board, its nylon or teflon, the white one

[kj]

kevin we have delrin lol, but i think some co2 users also make use of chopping board, its nylon or teflon, the white one

ok, but where to get ? i'd need 1/2" or 5/8" diameter delrin rod.

thanks eumel

[fivestar45]

kj
You are picking up speed as the gas temp drops. So to even things out my guess would be a bit more spring in the striker. I really doubt that you need the extra volume of a boss valve, I'd go with a Disco valve and if possible lighten the striker a bit. Are you using a hard stem, or a soft one? The hardest one that will seal would be best for you.

hi anthony, the boss valve has a disco stem ...i think. i'm not sure on that though.  i have disco valve stems on hand though. and disco valve. i have plenty room left to increase pre=load, and or change the throw. the hammer i'm using is the p-rod hammer/striker set-up, same one in the challenger.

so if i up the pre-load and start at a higher fps do you think it will even out ? i'll try switching out the valve to the disco valve. and open up the boss valve and see what stem it has. i thinjk this boss valve will be great for my .25's though..lol

what about the ping sound ? sounds almost like a spring vibrating or something ?

have nice day
kj

kj, pretty much all of my rifles "Ping" The only one that might not is the alum tube Disco with the Don Cothran valve.
As far as the striker weight goes, I'm pretty sure the P'rod with the hammer installed weighs just about the same as the oem 2240 +- 58g. Another thing to note is if you are using that factory hammer/stroke adjuster, even with it backed out to where it is flush against the striker face you will loose about .060" of stroke if you use a standard length Disco stem. I use those strikers but I use a 1/4x28 allen set screw with the face ground flat for the stroke adjustment. To further lighten them I also bore them and use a Delrin insert to bring the I.D. back to size. My thoughts for you..the smaller Disco valve and stem, standard stroke, and a bit more spring pre-load. And if at all possible see if you can get the striker down to 50g or less. That will kill some of the dwell time.

thanks again anothony for your input. i'll definitely switch out the valve and increase pre-load like you and bob said . i  also have another valve option. it's a smaller hole front of the valve that screws onto a regular 2240 valve. i think i'll try the disco valve first. i'm also going to try to make a smaller transfer port that bob mentioned. but i'll try the other things first. i gotta wiegh that hammer. i don't have any delrin here and don't know where to get it .  getting/finding things here is alot different than back in the states...3rd world living..lol/  i could shave the sides some and drill some cross holes.   wouldn't lessening the throw have a similar effect as lightening the hammer ?

peace
kj

kj, lightening the striker allows the valve to close quicker. A longer stroke will increase the hit.
If after flattening the curve a bit you want to slow down the fps another alternative would be to drop in a valve volume reducer sleeve from a 2300.

[Rob M]

kevin we have delrin lol, but i think some co2 users also make use of chopping board, its nylon or teflon, the white one

ok, but where to get ? i'd need 1/2" or 5/8" diameter delrin rod.
ebay from china?

thanks eumel

ebay china ?

[dv8eod]

kevin we have delrin lol, but i think some co2 users also make use of chopping board, its nylon or teflon, the white one

ok, but where to get ? i'd need 1/2" or 5/8" diameter delrin rod.

thanks eumel

Try these places, kj. I didn't see any places listed for Mindanao, but I would think they are there somewhere. Have you asked any of the local shooters?
https://www.monotaro.ph/k/store/Delrin/
http://www.enlonphil.com/enlon/about_us.php

[kj]

kevin we have delrin lol, but i think some co2 users also make use of chopping board, its nylon or teflon, the white one

ok, but where to get ? i'd need 1/2" or 5/8" diameter delrin rod.

thanks eumel

Try these places, kj. I didn't see any places listed for Mindanao, but I would think they are there somewhere. Have you asked any of the local shooters?
https://www.monotaro.ph/k/store/Delrin/
http://www.enlonphil.com/enlon/about_us.php

hi terry , thanks for the links. maybe have some place in davao, depending where in davao it's a 30-60 minute taxi ride from here. the only guy i know here in toril that might know is the local gun maker, but he doesn't use anything like this. everything is a metal in his guns. another guy from the philippines in our forum , eumel , sent me some links and a phone number of someone. he got me into some philippine f.b. airgun groups and has been very helpful. pretty knowledgable guy and nice too.

just got my residency approval. so i have to go into davao next week. if i find somewhere that has it i can get some then.

i'll message you after i get my paperwork and find out about the registering airgun thing.

have nice evening
kj

[dv8eod]

Awesome. I've only seen the latest regs for bringing PBs over. Possibly more hassle than it'll be worth considering what there is to hunt.
It's looking like it'll be a few more years before I manage to get over there. Gotta get the kid out of the house first. She doesn't want to do college over there for some reason.
Got a lead on someone who just might be able to work out the CO2 plenum conundrum. I'll let you know what I find out.
Terry

[kj]

Awesome. I've only seen the latest regs for bringing PBs over. Possibly more hassle than it'll be worth considering what there is to hunt.
It's looking like it'll be a few more years before I manage to get over there. Gotta get the kid out of the house first. She doesn't want to do college over there for some reason.
Got a lead on someone who just might be able to work out the CO2 plenum conundrum. I'll let you know what I find out.
Terry

sounds good, thanks. not much to hunt here that would require a PB. you could always pick up a .22 . seems air rifles do most the hunting. doves , are big here, some ducks if you can find them,. monitor lizards.

i have and expansion chamber idea also if i need it. i'm trying the other suggestions today in a little bit. let it warm up more . my idea is to cut off the back of a disco valve where the valve stem protrudes after removing the valve stem and spring. fill the hole in the front of the valve and drill a small hole in the 12 o'clock orientation to let the gas in the top of the tube pass to the valve that's actually in operation. i figure i could slide it in up to the face of the other valve and it wouldn't be going anywhere.  hopefully i can get it tuned without it , but it's a thought if needed.

let me know what you come up with
thanks
kj