mcarterbrown.com  

Ask The Experts You ask the tough questions

Reply
 
Thread Tools Search this Thread
Old 03-25-2020, 08:27 AM   #1 (permalink)
Active Member
 
Join Date: Feb 2013

That low(er) pressure tippmann thread got me thinking...

So today is the last day of work at my factory before a coronavirus shutdown, and I've got 8 hours to do basically nothing, and the machine shop is completely open.

I have some spare Tippmann 98 parts, and i was thinking about milling out the air passages in the valve a bit because I've read that that can help lower operating pressure, along with other mods.

So i guess my question is, how deep or wide should i machine these passages to be? I don't really have any numbers to work with.

Last edited by brokeass_baller; 03-26-2020 at 10:11 AM.
brokeass_baller is offline   Reply With Quote
Old 03-25-2020, 10:10 AM   #2 (permalink)
Super Legit
 
Trbo323's Avatar
 
Join Date: May 2012
Location: Vancouver, Washington

I believe the answer is, yes

There's not going to be a perfect answer because everyone's marker is different and especially with the mods you have on yours being different than the mods someone else had on their prior to modding the valve.

I wouldn't really go deeper. Wider yes but not really deeper
__________________
https://www.mcarterbrown.com/forums/n...ml#post2612544

^^^ If you are new to the sport and need help finding gear, click here!!!^^^


feedback: https://www.mcarterbrown.com/forums/f...-feedback.html
Trbo323 is offline   Reply With Quote
Old 03-25-2020, 10:57 AM   #3 (permalink)
Active Member
 
Join Date: Sep 2015

What do you machine that isn’t considered “essential”? Also I don’t think you would want to mill them deeper, I thought if anything you would go wider. Also isn’t the valve volume the biggest limitation? Thinking about it more, wouldn’t you want to devolumize the passages.. making them too big gives the greatest opportunity for headloss or expansion of LP air, with is essentially death for LP systems..

Last edited by Frmespec; 03-25-2020 at 11:00 AM.
Frmespec is online now   Reply With Quote
Old 03-25-2020, 11:18 AM   #4 (permalink)
Active Member
 
Join Date: Feb 2013

I'll likely be using HPA, so I'm not sure how much expansion occurs. Maybe i won't touch the channels then.

Last edited by brokeass_baller; 03-25-2020 at 12:39 PM.
brokeass_baller is offline   Reply With Quote
Old 03-25-2020, 12:02 PM   #5 (permalink)
Intermidiate
 
BLINDMAN Pb's Avatar
 
Join Date: Feb 2017

I can confirm that if improperly done, widening/deepening the valve passages will be detrimental to velocity. The passages on the tippmann model however are widened and slightly deepened, but again to unknown specs.
BLINDMAN Pb is offline   Reply With Quote
Old 03-25-2020, 12:28 PM   #6 (permalink)
Super Legit
 
Trbo323's Avatar
 
Join Date: May 2012
Location: Vancouver, Washington

Quote:
Originally Posted by Frmespec View Post
What do you machine that isn’t considered “essential”?
Again, nobody is going to know this for sure because your exact setup is going to be different than someone else

Different bolt, input pressure, barrel, paint etc will all effect the air flow slightly

What you are doing is trying to get closer and closer to the line between functioning and not and nobody is ever going to be able to tell you exactly where that line is until you cross it

This is why, for the most part, I don't suggest going crazy on tippmanns. The "payoff" of having it function slightly better, or at lower pressure isn't proportional to the amount of work and risk involved.


But if you must have a guess at an answer,
I'd start by widening each passage about 1/8". Worst case is it doesn't work and you need a new valve body
__________________
https://www.mcarterbrown.com/forums/n...ml#post2612544

^^^ If you are new to the sport and need help finding gear, click here!!!^^^


feedback: https://www.mcarterbrown.com/forums/f...-feedback.html
Trbo323 is offline   Reply With Quote
Old 03-25-2020, 12:41 PM   #7 (permalink)
Active Member
 
Join Date: Feb 2013

These are all spares I'm messing with. If i mess it up badly, I'll slap back in the unmolested parts that are in there now and she'll work again.
brokeass_baller is offline   Reply With Quote
Old 03-25-2020, 01:09 PM   #8 (permalink)
Shi Tamagutsu Ka
 
Pyrate Jim's Avatar
 
Join Date: Apr 2006
Location: the group W bench

Keep in mind that volume over pressure is equal to pressure over volume.
In other words, one cubic inch of air at 500 psi does the same work as five cubic inches at 100 psi.
So to lower the pressure you need to increase the volume of air used. Just opening up the chamber does little unless you can also keep the valve open longer.
__________________
CT co-ordinator, Paintball Marshals
https://www.pbmarshals.com/
PTI #2691 ~ C1, C2, C5, C5a, C6
Pyrate Jim is offline   Reply With Quote
Old 03-25-2020, 03:08 PM   #9 (permalink)
Post Whore
 
Cunha's Avatar
 
Join Date: Apr 2006
Location: Monterey, CA
Send a message via AIM to Cunha Send a message via MSN to Cunha Send a message via Yahoo to Cunha

Stock tippmann CVX valve is really great.
__________________
"I'll see it when I believe it"

PSA: To post direct images when using imgur or other hosting site, copy the "direct link" url in between these image tags [img]yoururlhere[/img]
Cunha is offline   Reply With Quote
Old 03-25-2020, 04:16 PM   #10 (permalink)
Active Member
 
Join Date: Feb 2013

I decided not to mess with the valve. Instead i Swiss cheesed the hammer. Lol.

I was just thinking larger passages would equal more air down the barrel, so maybe a rise in velocity and i could tune it to softer springing. But i guess I'll just leave it be for now.
brokeass_baller is offline   Reply With Quote
Reply

  mcarterbrown.com » Paintball » Ask The Experts

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

Forum Jump


All times are GMT -4. The time now is 11:43 AM.


Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO
© MCB Network LLC