reducing valve airflow

[Jimski]

considering such a valve:



if I'm not mistaken, the 4 round holes in the central cylinder are the way out for the gas, is that right?
in that case, will reducing holes / capping them with some material theoretically reduce gas flow ?

[m102404]

Yes...to both your questions.

[Hectic]

I dont think by much it will just come faster out of smaller / less holes the ammount of gas should remain about the same as that would be controlled by the ammount that the valve opens and how hard the valve knocker hits the valve.
Ill use the oposite example there was a mod floating around the interwebs about increasing flow by making those holes bigger i did it to my ksc glock and then just bought hiflow vaves because it didnt really change anything the hiflow valve actually had 2 holes instead of 4 but the plunger bit when pressed created a larger space to let the gas escape then the stock valve the hiflow opened almost fully while the stock one was closer to half
Think of a hose when u put yer finger over the opening the water volume doesnt really change it just comes out under more pressure and at a faster speed id think youd get the same effect by closing of holes in the valve it would "jet" out faster under more pressure but the same volume that the valve is desing to flow.
Think we need a scientist or physacist or somethin to explain it beter lol

[Jimski]

no it's pretty clear, thanks!
As I understand it, topologically the holes in the valve are just structures along the gas's path to the barrel, so the real parameter in the amount of gas flowing through should be the amount of time spent with the valve opened.
I believe this would be related to the balance between hammer spring and valve spring hardness.
right?

[Hectic]

Yup i lighter hammer spring or a stiffer valve spring would reduce gas flow.
Also but a lil tricky to acomplis depending on the gun a shorter valve knocker would reduce gas flow. The oasis gemtech is an example of an easy mod. The hammer sping is just a straight sprin removing a coil or two is an easy way to reduce fps also the valve knocker is just a str8 pin type knocker also easy to file a lil off to fine tune fps.
An m9 also uses a str8 spring easy to cut down or even put a spacer behind to reduce or increase fps. a glock however uses a funky lil hammer spring like this
Nearly imposible to adjust without a swap
What gun are u working on?

[Jimski]

interesting
I want to mod the Oasis Gemtech

[m102404]

coach posted some stuff on that before.

weakening the hammer spring is an option.

[Hectic]

http://www.airsoftcanada.com/showthr...ighlight=oasis

http://www.airsoftcanada.com/showthr...ighlight=oasis

Those two threads discuss it a bit. Im not sure if coach went ahead and moded one yet or not.
The other easyest option would just be to run it on duster instead of propane. I guess yet tryin to make it cqb friendly? The fps is nice n low on duster and the pistol still works well.
Not sure why ud wanna run it indoors tho that damn long ass trigger pull makes it not a great pistol for dbl taps or follow up shots

[Jimski]

I want to run it indoor because GBBs are i.m.o not reliable enough in the long run and I've spent enough money on them, so I got this NBB
I'm planning on using duster as well so yes, modding it will be a 'last resort' option.

Not sure why ud wanna run it indoors tho that damn long ass trigger pull makes it not a great pistol for dbl taps or follow up shots

I know, I want to see if it is such a tactical bummer.

[Hectic]

U wont need go mod it if u run duster if i remember right its around 285fps and quality gbb are reliable even some cheaper full metal ones stand the test of time. I have a kj m9 vertec full metal that has been through rain snow mud sand and swamp with over 20000 rounds through it i use as my sidearm scince 2007 its still goin strong

[Jimski]

yep, my kjw hi-capa co2 was very good for a long time but now it has problems cycling.I can't stand crappy cycles and shitty action so I stopped looking to fix it and want to use finger power instead.

[Hectic]

Also a full plastic tm ran on duster could argueably last a lifetime

[Styrak]

Originally Posted by Jimski

I want to run it indoor because GBBs are i.m.o not reliable enough in the long run and I've spent enough money on them, so I got this NBB
I'm planning on using duster as well so yes, modding it will be a 'last resort' option.



I know, I want to see if it is such a tactical bummer.

If you buy a good quality GBB like a TM it will last forever with minimal issues if any.

[Hectic]

Did Styrak mention he has some stock on TM pistols

[Jimski]

Originally Posted by Styrak

If you buy a good quality GBB like a TM it will last forever with minimal issues if any.

I have bought many 'quality' pistols and they were all crap without any exception; including several KSCs, TMs and Tanaka.
Not a single one lasted more than a few games except that KJW hi-capa that eventually died.