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PostPosted: Tue Apr 15, 2014 6:19 pm 
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I went looking for a heavier hammer spring today and found what I was looking for at an auto parts store. An 8 inch long 3/16 brake line . It had a spring around it that was perfect, and long enough for 2 spring,s. Total cost $1.60.

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PostPosted: Tue Apr 15, 2014 8:02 pm 
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are you talking about brake line shield Joe /
Like this: http://www.drclassic.com/catalog/Camaro ... 00127.html

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PostPosted: Tue Apr 15, 2014 9:56 pm 
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Just curious why you want a heavier hammer spring on a 2240.... they already waste CO2 with the stock one.... While you might gain a tiny bit of velocity with a 24" barrel, with the 8" one you will just get more noise.... topic59801.html

Bob

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PostPosted: Wed Apr 16, 2014 12:11 am 
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since your on the subject Bob i have that 2240 on HPA project gun down to 485-490fps for better efficiency and shot count but its still barking very loud. :shock:
any suggestions? besides the obvious which is illegal and a big no,no.... :?

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PostPosted: Wed Apr 16, 2014 4:30 am 
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Ace wrote:
are you talking about brake line shield Joe /
Like this: http://www.drclassic.com/catalog/Camaro ... 00127.html

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no, the ones I found were on rigid brake line and the coil spacing was wider. I get no bind at all.

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PostPosted: Wed Apr 16, 2014 4:32 am 
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rsterne wrote:
Just curious why you want a heavier hammer spring on a 2240.... they already waste CO2 with the stock one.... While you might gain a tiny bit of velocity with a 24" barrel, with the 8" one you will just get more noise.... topic59801.html

Bob

my 2240 is fitted with the hipac and at 1500 psi the stock spring won,t open the valve.

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PostPosted: Wed Apr 16, 2014 4:37 am 
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Ace wrote:
since your on the subject Bob i have that 2240 on HPA project gun down to 485-490fps for better efficiency and shot count but its still barking very loud. :shock:
any suggestions? besides the obvious which is illegal and a big no,no.... :?

I dont know if this helps but I have the AT44 lw long barrel and the difference in loudness from the stock barrel is very noticeable. Also on my 2240, the 24" barrel is much quieter.

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PostPosted: Wed Apr 16, 2014 8:51 am 
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Great find Joe. How does the stiffness compare to the stock spring? I need less spring force than stock, but if the spring isn't too stiff I could cut it short.

Jim


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PostPosted: Wed Apr 16, 2014 10:07 am 
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Ah, yes Joe, you would need a stiffer spring for 1500 psi....

Ace, the bark is primarily from getting near 500 fps with an 8" barrel.... The only way around it would be to use very high pressure and a very short valve dwell to get the valve to close before the pellet has moved more than a couple of inches....

Bob

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Airsonal;
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PostPosted: Wed Apr 16, 2014 10:24 am 
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EverHopeful wrote:
Great find Joe. How does the stiffness compare to the stock spring? I need less spring force than stock, but if the spring isn't too stiff I could cut it short.

Jim

Quite a bit stiffer.

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PostPosted: Wed Apr 16, 2014 12:12 pm 
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rsterne wrote:
Ace, the bark is primarily from getting near 500 fps with an 8" barrel.... The only way around it would be to use very high pressure and a very short valve dwell to get the valve to close before the pellet has moved more than a couple of inches....Bob

Its got a 14" barrel which doesn't make much deference, so a stronger valve spring then ?
makes since, I'm sure theres air flowing out way after the pellet has left the barrel, since it has a lighter spring in the valve at the moment, but i also have a lighter hammer spring in it as well thinking they would cancel each other out guess not.

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PostPosted: Wed Apr 16, 2014 3:20 pm 
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Have you ever tried to find the knee of the velocity curve?.... back off the hammer spring until the velocity drops a bit, you may be surprised at how much quieter it is and more shots....

Bob

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Airsonal;
Too many! Springers, Pumpers, CO2, but I love my PCPs and developing them!
Proud Member of the 2000+fps Club!


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PostPosted: Wed Apr 16, 2014 3:22 pm 
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not yet but i I'll will try that Bob, but at the same time should i re-install the stock valve spring ?

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PostPosted: Wed Apr 16, 2014 5:33 pm 
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You can try it both ways, but if you are on the plateau (above the knee) a stiffer valve spring may help....

Bob

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Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since!
Airsonal;
Too many! Springers, Pumpers, CO2, but I love my PCPs and developing them!
Proud Member of the 2000+fps Club!


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PostPosted: Wed Apr 16, 2014 5:56 pm 
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OK thanks Bob. :wink:

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