Need HELP with Main Springs!

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DJAlpha

Member
Jun 7, 2020
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Northumbria
Hi, I am a newbie not only to this forum but also to air gunning in general. 
I'm trying to learn as much as I can about my gun... a Remmington Express XP (I didn't want a £200+ gun in case this sport is not for me. - So far I'm loving it :) 

My mainspring has the following measurements:

Outer Diameter: 20.6mm
Inner Diameter: 13.68mm
Wire thickness: 3mm
Coils: 26
Length: 220mm


I am wanting to change the mainspring and I'm planning on installing a tuning kit.
What leverage of the measurements should I allow? For example, for length... 'I don't want the new spring to have a length any bigger than 260mm' or for the number of coils 'I don't want to exceed 30 coils'. (These are guesses)

This is properly basic physics but I just want to confirm... Do more coils mean higher power output of the spring (Not talking about the gun) or is it longer length that increases the springs power? 

FYI: I'm wanting to avoid cutting coils.


All replies are much appreciated
 
Hello NEWBIE and WELCOME. I am just curious as to why you want to be an AIRGUN TUNER even before you know for sure if this AIRGUNNING SPORT is your cup of tea? I would just go shoot it and if yous is 177 be sure to use heavy pellets such at 10.3grain JSB or Air Arms or 10.5grain CROSMAN Ultra MAGNUMS or H&N Barracuda 10.6gr specifically. Yo!
 
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Reminds me of a long ago friend from school. His parents were rich bought him a new Toyota. Less than a month he gathers some classmates to chop all of the coil springs to drop it to the ground to be cool. Car wouldn't drive straight and became too dangerous to drive. Toyota OUTRIGHT REFUSED to warranty that BRAND NEW CAR. Father hired a lawyer to take TOYOTA to court. $10,000.00+ Lawyer and court fees later AND $4000.00 later it's all back to original condition and made them sign acknowledgement of malicious intent to destroy their Brand thus nullifying any and ALL WARRANTIES. Yo!
 
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Try calling Tom G. at Vortek airgun tuning. He's a Great guy and will gladly offer suggestions,advice and if possible,any parts needed.

Hope this helps!

Mike
Click to expand...

The parts kit with shipping will cost more than the gun. Yo!
Click to expand...

The point of my suggestion was to ask advice from a Real pro and perhaps obtain a piston seal or spring...keeping in mind that the rifle most likely cost more than 20-30 bucks. Not suggesting an $80+ PG3 Tune kit!

Mike
 
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If you are looking for better accuracy, reducing power is what most people do. If you want to increase power to see what happens, then increasing wire diameter while keeping length, inner diameter and number of coils the same would do that. In general springs are fitted to the inner guides, so ID should be kept the same. Just increasing the wire diameter a small amount should not cause the spring to go solid when cocked, but that is something else to keep in mind. Another option would be to add a coil or two while keeping the same coil spacing. This will increase the free length, and definitely increase the possibility of the spring going solid.

As others have stated, yours may not be the best gun to start experimenting with. I don't know if there is someone out there selling tuning parts for it or not. You might search online. I know there is a company in India that sells parts for Gamo, maybe they have parts for your rifle as well.
 
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why for ,use heavier pellets first..another thing; I Always use a spring compressor when taking a springer apart....poor friend did not,poor friend got a big ochie=hurt from force of spring uncompressing itself on a body part.

Ask your self is it really going to be worth it...if so Vortek and JM spring gun tune kits are top notch,plus Jim sells just the springs... 
 
Upvote 0
Try calling Tom G. at Vortek airgun tuning. He's a Great guy and will gladly offer suggestions,advice and if possible,any parts needed.

Hope this helps!

Mike
Click to expand...

The parts kit with shipping will cost more than the gun. Yo!
Click to expand...

The point of my suggestion was to ask advice from a Real pro and perhaps obtain a piston seal or spring...keeping in mind that the rifle most likely cost more than 20-30 bucks. Not suggesting an $80+ PG3 Tune kit!

Mike
Click to expand...

😆😆 😆 Yo!
 
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why for ,use heavier pellets first..another thing; I Always use a spring compressor when taking a springer apart....poor friend did not,poor friend got a big ochie=hurt from force of spring uncompressing itself on a body part.

Ask your self is it really going to be worth it...if so Vortek and JM spring gun tune kits are top notch,plus Jim sells just the springs...
Click to expand...

Actually he can do it with a car and a good stable brick wall and a car scissors jack and Couple of 2x4s with the muzzle wedged in a tire thread. Talk about BACKYARD MECHANIC ACTION. Had to install an ACE Hardware weaker spring for a bud's kid who bought One of those cheap $90 Chinese magnum Wal-Mart break barrels for $20 at a garage sale who had the darndest time cocking it. Lured me all in with the darn Mickey-Ds!!! I have a spring compressor at home and was too lazy to drive back to go get it. Had the dad watch me so next time he can do it himself since I told him I have no idea how long that springs gonna last. Yo!
 
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Here's some basics I believe in:

A smaller diameter spring will be stiffer than a bigger diameter spring of the same wire size. 

A longer spring with more preload will reduce piston bounce, and usually boost power a touch. 

Throwing in a heavier spring won't necessarily boost power. 

A larger diameter softer spring will likely last longer than a smaller diameter one. Less stress. 

The most important thing you can do is make sure your gun is sealing well. The piston seal needs to fit well, and be properly lubed. Check the breech seal. 

If you are reusing your old guides, pick a spring that fits them well and tailor your power by spring length and preload. 

When tinkering, it's best to get a spring that's too long and shorten it as necessary. Cutting and closing coils is not difficult. 

Be mindful of the OD of the spring you select, and make sure it will still fit inside the piston. 

When I go into making a custom tune from scratch, I like a bigger diameter spring of heavier wire size. I think they shoot softer and last longer. Make a piston sleeve from PTFE sheet or plastic and it will really help with the buzz. Just my opinion. 
 
Upvote 0
Here's some basics I believe in:

A smaller diameter spring will be stiffer than a bigger diameter spring of the same wire size. 

A longer spring with more preload will reduce piston bounce, and usually boost power a touch. 

Throwing in a heavier spring won't necessarily boost power. 

A larger diameter softer spring will likely last longer than a smaller diameter one. Less stress. 

The most important thing you can do is make sure your gun is sealing well. The piston seal needs to fit well, and be properly lubed. Check the breech seal. 

If you are reusing your old guides, pick a spring that fits them well and tailor your power by spring length and preload. 

When tinkering, it's best to get a spring that's too long and shorten it as necessary. Cutting and closing coils is not difficult. 

Be mindful of the OD of the spring you select, and make sure it will still fit inside the piston. 

When I go into making a custom tune from scratch, I like a bigger diameter spring of heavier wire size. I think they shoot softer and last longer. Make a piston sleeve from PTFE sheet or plastic and it will really help with the buzz. Just my opinion.
Click to expand...

Great advice!

That's what I'm talkin about! 

Thank You,

Mike
 
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