Umarex Umarex Notos return spring.

Jump to latest Follow Reply
P

purplepom

Member
Nov 26, 2024
3
2
Hi all,

Quick question, any body have any experience with modifying the return spring on the umarex Notos poppet valve? Im trying to maximize volume of air (extended barrel) to push some slugs hard.

Any suggestions on a good replacement spring?

If I have to take material off the spring how much should I go? I would prefer not to have to do this of course. I like to preserve all my stock parts.
 
I cannot recommend removing the spring but replacing it is a possibility.

In my testing, changing the preload spring made no discernable difference in pellet speed but it sure did open up my ES from 6 to 20!

2000 psi vs a #1 spring?

I would not expect any noticeable change.

Porting air passages, TP and barrel port?

Yes! Along with a longer barrel, you will make better speeds.

20240921_183918.jpg
 
Upvote 0
Firewalker said:
I cannot recommend removing the spring but replacing it is a possibility.

In my testing, changing the preload spring made no discernable difference in pellet speed but it sure did open up my ES from 6 to 20!

2000 psi vs a #1 spring?

I would not expect any noticeable change.

Porting air passages, TP and barrel port?

Yes! Along with a longer barrel, you will make better speeds.

View attachment 517420
Click to expand...
I'm actually getting the porting done now. Btw is that a 700 mm barrel on your Notos? If so I can you DM me where I can get one?
 
  • Like
Reactions: Firewalker
Upvote 0
You must log in or register to reply here.
Top Bottom
Back
Home
Forums
Resources
Menu