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TCooper
PostPosted: Thu Nov 11, 2021 3:39 pm 
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A friend has a .22cal Diana 24 that is shooting healthy but he wants more power (he has a PAL). This D24 is currently shooting around 480fps with 14.3gr pellets so it likely has a full power mainspring. Has anyone installed a slightly heavier spring in a .22cal D24 and seen improvement without extreme harshness? I haven't pulled this rifle apart yet but assume the spring has a .560"ID and around .105-.110 wire thickness.

I realize that the swept volume on this rifle is short so power improvement is limited. I'm just curious to hear if anyone has had success and how they got there.
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notec
PostPosted: Thu Nov 11, 2021 3:54 pm 
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Mine was shooting 430 out of the box, and with a lube and tune it settled in at 460........There wasnt much room to put a longer spring in it. So you would have to go with a thicker coil......


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lauchlin
PostPosted: Thu Nov 11, 2021 4:11 pm 
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Did you look at this topic8421.html

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TCooper
PostPosted: Thu Nov 11, 2021 5:23 pm 
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lauchlin wrote:
Did you look at this topic8421.html


Yup, I read that one from 2006. That was 15 years ago and I noticed that I posted on it as well.

I was hoping to find a .550" to .560"ID spring so a custom guide wouldn't be needed. A simple spring swap would be nice. If a custom guide is needed then maybe the best bet would be to adapt to the cheapo Crosman B18 line of springs. The Crosman 4B is .118" wire but a .475" guide would be needed.
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killercrow
PostPosted: Fri Nov 12, 2021 2:33 am 
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Is there any way to lengthen the stroke?
I'm not familiar with the gun... But with way too much effort I was able to gain some with a 350 clone. Shorter latch rod, longer cocking arm slot and I actually had to file a bit of material off the barrel block. Wasn't really worth the effort. I gained a few fps then ended up going back to the normal stroke as the recoil was noticeably worse.
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TriggerHappy416
PostPosted: Fri Nov 12, 2021 9:20 am 
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I've had a Diana 24 that had washers in there to increase the preload. This got it very close to 500fps. However, I found the shot cycle to be much harsher. I don't think the 24 is a good platform for increasing power. It's too light of a springer to handle stronger spring vibration and buzz.

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TCooper
PostPosted: Fri Nov 12, 2021 11:18 am 
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The rifle is in very nice condition so my friend wouldn't be too fond of me chopping or cutting his OEM parts for experiments. He was hoping a simple spring swap would give a bit more power. I'm guessing that if it was that simple then Diana would have been using the stronger spring already.

It would be interesting to try a .115" to .118" wire spring with a snug piston liner to see the results. The liner might help tame the rifle to keep it comfortable.
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MisterJ
PostPosted: Mon Jan 10, 2022 1:52 pm 
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I have a Diana 280 that I bought from the forum store, I also bought the Diana full power spring to put in it. The fps is up in the low 600s (personally I thought it would have been a bit higher). It changed the feel of the rifle too with a noticeable thwack with each shot now.
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