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Spring pressure in a vortex cap

This area is for the discussion of BB or airsoft sub machine guns, and or other small arms such as pellets.
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Spring pressure in a vortex cap

Unread postAuthor: Cannoneer » Sun May 02, 2010 8:35 pm

I recently built a vortex cap BBMG it does not jam frequently but I wanted a plunger to improve performance. My question is: how strong does the spring need to be? because when I tried to use a toilet paper holder spring it completely stopped the gun from firing. The mag is 3/4"x21/2" and the spring is about 4". I'm guessing that the spring needs to be very weak. I have done a search but I couldn't get a good answer. Thanks.
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Unread postAuthor: Gaderelguitarist » Sun May 02, 2010 10:10 pm

With a spring plunger you may need to upgrade to using a vortex block. They're relatively straightforward to construct and will improve the performance of your bbmg.

A spring plunger in a cloud setup would compress the bbs together so there is less agitation when the air is introduced. Granted the spring will go backwards if the pressure is great enough, but generally bbmg chambers aren't exerted to much.

EDIT:

I'm sorry I didn't answer your question. :oops:

The spring has to be strong enough to push the bbs towards the barrel, but weak enough to not compress them to thoroughly. Use a vortex block and this problem is nullified.
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Unread postAuthor: Cannoneer » Sun May 02, 2010 11:04 pm

Thanks. I definatelly see what you mean about a vortex block and while it won't help the vortex cap Il definatelly implement an effective spring in my next one:)
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Unread postAuthor: Gaderelguitarist » Mon May 03, 2010 2:10 pm

Oh wow I must have not been paying attention. Thats twice I've faulted.

I thought you were reffering to an inline setup.

I'm not all too familiar with the vortex cap setup, though I understand it's workings. I still think that the spring might be too strong to allow for enough aggitation, although a toilet paper holder spring would in theory be very light.
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Unread postAuthor: clemsonguy1125 » Mon May 03, 2010 3:06 pm

I had the same problem with mine, it wouldnt fire if I had a spring, weight or too many bbs in it, the only way I found to fix this problem was to up the pressure
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Unread postAuthor: Cannoneer » Mon May 03, 2010 3:10 pm

Yeah I might just try cutting the spring down. If that doesn't work then I'm just going to use it as-is unless I can find an appropriate spring in some toy.
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Unread postAuthor: irisher » Mon May 03, 2010 4:00 pm

Do you have shims on your cap? Because that will make a big difference.
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Unread postAuthor: Cannoneer » Mon May 03, 2010 7:07 pm

No it's just 31/4" pipe all the way to the cap. I actually haven't thought of using shims but it sounds like a good idea Ill try to add some though.
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