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PostPosted: Sat Jul 15, 2017 2:18 pm 
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Joined: Mon Sep 17, 2007 8:13 am
Posts: 1063
Location: Victoria, B.C.
I just restored a badly neglected 618, had a hose clamp to keep the action in place as it was missing all the screws and was pretty rusty on the surface.

Now I know these were rated for about 400 FPS but has anyone ever got one to shoot close to 500 FPS?


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PostPosted: Sat Jul 15, 2017 5:53 pm 
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Joined: Thu May 07, 2015 8:30 pm
Posts: 1190
Location: Eastern Townships
IMHO, that could be hard to attain. Piston chamber is 24 mm ID IIRC, and piston stroke is around 55-60mm, so you're limited by swept volume. Then take into account the stock spring wire diam, which is 0.098'' I think. You'd have to get a custom spring made with bigger wire, and probably use a synthetic, flat-faced piston seal instead of the stock leather seal. I would also be a bit worried about the sear, would it hold for long with the added spring pressure? Couldn't say. Interesting idea though, keep us posted :)


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PostPosted: Sat Jul 15, 2017 10:49 pm 
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Joined: Mon Sep 17, 2007 8:13 am
Posts: 1063
Location: Victoria, B.C.
I just wanted to see if anyone attempted such feat. It's a sweet little gun as is and pretty accurate, fun to shoot.


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PostPosted: Sun Jul 16, 2017 6:15 am 
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Joined: Thu May 07, 2015 8:30 pm
Posts: 1190
Location: Eastern Townships
Mar wrote:
I just wanted to see if anyone attempted such feat. It's a sweet little gun as is and pretty accurate, fun to shoot.


I so agree! I have two of them, one in perfect order, the other still in bits. Really pleasant for plinking and 10 meters target shooting, and nice looking to boot :)

You may check with Jim Maccari or D&L Airguns for a spring. Don't know where you could get a synthetic seal for it, for my good one I made a new leather seal and re-used the original spring, and I'm happy with it 8) . Because of its age (50 years, made in 1967), I didn't want to mess too much with it.

Here are some links that I hope may help:

topic44096.html

topic31627.html

http://anotherairgunblog.blogspot.ca/20 ... art-1.html

http://anotherairgunblog.blogspot.ca/20 ... art-2.html

http://anotherairgunblog.blogspot.ca/se ... avia%20618

Cheers!


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PostPosted: Mon Jul 17, 2017 1:36 am 
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Joined: Mon May 26, 2014 1:08 am
Posts: 480
Location: Thunder Bay
I have a 618 that I tuned. It makes 400 fps with a 7 gr pellet, a good stiff tailwind, and total planetary alignment. It's an accurate little Springer that shoots any pellet well, even Daisy pointed!!
I don't know if it would still be as pleasant to shoot if you speeded it up.

_________________
12 springers and a couple of pumpers.
2 lathes and lots of scrap metal.

I'm not multitasking. I'm doing something else until I remember what I was doing.


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PostPosted: Tue Jul 18, 2017 5:52 am 
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Joined: Sun Apr 23, 2017 4:10 am
Posts: 61
airmec wrote:
IMHO, that could be hard to attain. Piston chamber is 24 mm ID IIRC, and piston stroke is around 55-60mm, so you're limited by swept volume.


The volume (from a given data) is about 25 cubic centimeters. Spring-piston airguns usually limited by 2-2.5 q.cm. for every joule of muzzle energy, so the maximum achievable power will be around 10-12,5J. It translates to 650+ FPS with 0,5 gramm pellets.

In fact, the parameters of cylinder is very common for a standard-power spring airguns, rated below 7,5J. And all of them usually can go just beyond 10J after upgrades. Probably just installing a stiffer spring will result in "breaking" 500 FPS barrier w\o any precise adjustments.

_________________
Rifles: Horhe Jager .22 (LW barrel, 4500psi tube), Mp-512, Mp-60
Pistols: 46M, Zoraki HP-01 ultra, 2240, baikal drozd.


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