Another 2240 thread

[Jester]

If I replace the hammer spring with a 2289 hammer spring, drill out the barrel and valve ports and use poly tubing, roughly how many fps will this get me?
If I don't want to change the barrel for a longer one, would this tune be too much and result in wasted CO2? With the original barrel should I only do the port mod?

-Chris

[killercrow]

you wont waste any more co2 than normal unless you mod your valve. well maybe a bit since your putting in a harder spring... yeah, you could use a longer barrel, and see even more power increase. wouldnt worry too much about wasted gas though. i had a gun that gave me about 10 shots per co2 cart was worth it!

[airsmith282]

to end up using extra gas you really need to inlarge the inner cavity of the valve body so the valve will hold more air/gas.. the heavier hammer spring alone only makes the present amount of air come out faster, the valve is a hammer pericing type so the co2 is not allowed back into the valve untill the stem retracts back to a closed position the only way around this would be to do the mod that jez and I worked out on a SA6/44 valve steam then you would get more air pass then you start wasting gas with a shorter barrel for sure.......

[sniper]

If I replace the hammer spring with a 2289 hammer spring, drill out the barrel and valve ports and use poly tubing, roughly how many fps will this get me?
If I don't want to change the barrel for a longer one, would this tune be too much and result in wasted CO2? With the original barrel should I only do the port mod?

-Chris

Yes, you're using more co2 by using 2289 hammer spring, you might not even
see much velocity gain since the power from co2 decline rapidly since
you're not replacing the barrel. I guess the problem would be after you hit
the max. co2 is needed to push the pellet to the end of 7" barrel anything
beyond that is co2 wasted since the pellet is already left the barrel.
I've done experiment on this by testing 2240 with 5 different rated of spring.
The best is if you're going to keep the stock barrel, just mod the ports, use
poly tubing, don't change the spring. This way, you get nice consistent
higher velocity for more shots than replacing the spring,
you get a constant dropping velocity from hi to low and constantly dropping your
point of impact.

[airsmith282]

no offence sniper but can you then tell me on a hammer periceing valve that with only changing the hammer spring you go threw more gas, i tested this many times and i get the same about of shots with only a hammer spring change and noting else alterted i get maybe 20 to 30 more fps becuase the gas is coming out faster and harder iam not using more gas then what the valve holds once the hammer hits the valve stem to relase the gas the pin blocks the co2 from entering the valve untill the stem rest again in the closed position. please explain this to me and how it is if iam getting same amount of shots that iam using more gas cause i cant see it ....???????????

[sniper]

Hi Airsmith,

Yes, it is true as you said it does increase perhaps upto 30 more fps.
the harder the hammer hit the valve stem the longer it stays open therefore more co2 is used as in the experiment I used the more stronger spring and out of the powerlet got less amount of shots. Infact after I used even more stronger spring, I heard the bang was louder but velocity on the chrono didn't get any higher from the last spring and the amount of shots out of one powerlet is even less, also I noticed that velocity drop quite a bit on every shots, which showed that every shot dumped alot of co2.
2240 gives about 30 consistent shots (460-475) before fps start dropping.
2289 hammer spring, without any mod gives about 21 consistent shots (490-505) before fps start dropping.
2240 stock hammer spring, mod port, poly tube, mod breech port on the barrel gives about 30 consistent shots (495-515) before start dropping.
I had documented the experiments but I can't find it in my HD but I'm going to mod one more 2240 and this one will stay with 7.5" stock barrel.

[Jester]

2240 gives about 30 consistent shots (460-475) before fps start dropping.
2289 hammer spring, without any mod gives about 21 consistent shots (490-505) before fps start dropping.
2240 stock hammer spring, mod port, poly tube, mod breech port on the barrel gives about 30 consistent shots (495-515) before start dropping.
I had documented the experiments but I can't find it in my HD but I'm going to mod one more 2240 and this one will stay with 7.5" stock barrel.

What barrel did the 2240's have for those numbers?
Since I don't want to replace the barrel, do you recomend then that I just do the port mods? I think I'll do that, then test it with the stock spring, a 2289 spring, and also a similar spring that I found at Canadian tire.

Did you know that Crosman Canada wants $7.47 just for ONE 2289 spring? The spring before taxes or shipping is only $0.92!!

[sniper]

What barrel did the 2240's have for those numbers?
Since I don't want to replace the barrel, do you recomend then that I just do the port mods? I think I'll do that, then test it with the stock spring, a 2289 spring, and also a similar spring that I found at Canadian tire.

Did you know that Crosman Canada wants $7.47 just for ONE 2289 spring? The spring before taxes or shipping is only $0.92!!

All that experiment using the stock barrel that comes with it (7.5")

The spring is actually can be shipped in an envelope and pay reg. mail,
it will get to where ever it is in 3 days.

If I would've known earlier I could've get D&L to stick in a couple of those
springs in my shipment, he only charge 2 bucks for the spring if I'm not wrong and I'm getting
next day shipment by purolator and then I could've mail it to you ....
If I were you, I would keep the stock spring and get more consistent shots.