Slavia 630, under powered

[lone-wolf]

I'm looking for your opinions, I got a Slavia 630 that has been in the family as long as I have been.
It seems way under powered, as I use it on squirrels in the barn and even for shots under 10yrds(dumb squirrels!) it knocks them over but doesn't kill them unless I hit them in the head. I'm using crappy tire crossman pointed pellets, would there be a better pellet to use? Is there anything myself, or a pro, can do to get a little better power out of it?

 

[trip43]

Check some of the US web sites and see if you can get a new main spring for it and maybe a new piston seal preferably the synthetic type , this should give you a performance boost. The crosman pellets are fine as long as their accurate in your gun .

 

[Vettek50]

you can improve the power, careful dismattle the gun. dis mattle the compression tube, you will find piston cup. (becarefull not to damage anything). remove spring. Why you ask? the spring is what powers the compression SO you need the ! replace it with stiffer spring OR ad spacers to one end (or both) . the object is to compress it to the max without it binding when cocking it. this is done several times to find exact fit. i think mine was .250" try that .. the other is to mod the power valve, create a larger chamber by remove what metal is not needed. next improve the flow of the air through the holes EITHER BY enlarging or just polish them. NOTE spring compression alone will improve performance up to 545 ft /sec. for pellet use the " premier hunting hollow point" by crossman..either .177 or .22 cal.. for more info utube has a good selection of 630 mods..
improved, shoot and giggle. worked for me!

I'm looking for your opinions, I got a Slavia 630 that has been in the family as long as I have been.
It seems way under powered, as I use it on squirrels in the barn and even for shots under 10yrds(dumb squirrels!) it knocks them over but doesn't kill them unless I hit them in the head. I'm using crappy tire crossman pointed pellets, would there be a better pellet to use? Is there anything myself, or a pro, can do to get a little better power out of it?

 

[leonardj]

the other is to mod the power valve, creaet a larger chamber by remove what metal is not needed.

What????

next improve the flow of the air through the holes EITHER BY enlarging or just polish them.

I have seen more spring piston airguns reduced to scrap steel paper weights by people that thought they knew what they were doing, attempting to modify the transfer port.

 

[leonardj]

I'm looking for your opinions, I got a Slavia 630 that has been in the family as long as I have been.
It seems way under powered, as I use it on squirrels in the barn and even for shots under 10yrds(dumb squirrels!) it knocks them over but doesn't kill them unless I hit them in the head. I'm using crappy tire crossman pointed pellets, would there be a better pellet to use? Is there anything myself, or a pro, can do to get a little better power out of it?

The 630 was never known to be a powerhouse, and generally shot at only around 450 or so FPS when new.
Try some of the suggestions offered in this thread, and you may be good to go:
http://www.canadiangunnutz.com/forum/showthread.php/989217-Power-loss

As well. a softer grade of lead pellet may help.
The Crosman pellets are quite a hard grade of lead, whereas, other brands, such as JSB, or RWS use a softer lead for their pellets.

 

[Vettek50]

yes your right..however, if attempted by someone that has seen more then looking, the improvements work just fine...

What????


I have seen more spring piston airguns reduced to scrap steel paper weights by people that thought they knew what they were doing, attempting to modify the transfer port.

 

[mbogo3]

Just spend $8 at D+L Airgun and get a replacement utility spring which will bring it back up to 550fps.I cleanly kill grouse with mine as it's very accurate.Polish the internals/Lube tune it with moly.Harold J+G Airgun in the States will also have the correct full power spring.

 

[leonardj]

yes your right..however, if attempted by someone that has seen more then looking, the improvements work just fine...

Ummm.....OK.
Since you seem to be implying that you know what you are doing, could you please explain what exactly you mean by:

the other is to mod the power valve, create a larger chamber by remove what metal is not needed

Where exactly is the "power valve" in a springer, and how does one "create a larger chamber" in it?

 

[Vettek50]

Ummm.....OK.
Since you seem to be implying that you know what you are doing, could you please explain what exactly you mean by:

Where exactly is the "power valve" in a springer, and how does one "create a larger chamber" in it?

LMAO ...see ,,what did i tell you sir look here: http://www.czub.cz/zbrojovka/cz-manual/Instruction-Manual-Slavia-630-631.pdf it a power books for dummies and here https://sites.google.com/site/cherrytwist/slavia631tune-upLMAO and that s the end my friend.

 

[Vettek50]

just spend $8 at d+l airgun and get a replacement utility spring which will bring it back up to 550fps.i cleanly kill grouse with mine as it's very accurate.polish the internals/lube tune it with moly.harold j+g airgun in the states will also have the correct full power spring.

i like it..

 

[lone-wolf]

I just took it apart for the first time(probably the first for the gun as well) and cleaned it up a little.
I notice on cherry twist write up, there's a spacer mentioned that my rifle did not have. The little plastic white one that is inside of the piston, but I don't see it on the exploded diagram by cz.

I will get a spring from d&l, they list some different sizes, which one should I be getting?

 

[jackrabbit000]

I've had mine since I was a kid. I mentioned the loss of power to a guy at work and he said that the leather seal is dried out. He told me to break the barrel, and just fill it full of 3 in 1 oil and let it sit for a week or two. Took it outside and shot it in the back yard and was surprised that it actually worked.

 

[Woody-to]

Ummm, I think I will go with Len on this one.
In my opinion Len is one of the most knowledgable people I have met when it comes to airguns, his reputation in the community confirms this.
In your links, I did not see the word "valve" mentioned. Nore is there mention of enlarging the chamber.
When you refered to it as a "power books for dummies" that suits it considering who is quoted in the article.

I realize that you were trying to help the original poster, but if he were to follow your instructions I do not think he would be thanking you in the end.

 

[lone-wolf]

The breech seal, well, it seemed pretty good with the tissue test, but yea, it's also pretty hard.
The piston seal is plastic. Seemed ok I guess.

Simple thing being, can I get a breech & piston seal anywhere in North America?

 

[leonardj]

LMAO ...see ,,what did i tell you sir look here: http://www.czub.cz/zbrojovka/cz-manual/Instruction-Manual-Slavia-630-631.pdf it a power books for dummies and here https://sites.google.com/site/cherrytwist/slavia631tune-upLMAO and that s the end my friend.

Just as I expected - you completely avoid answering a direct question with regard to your "advice", and use a couple unrelated URLs for a smokescreen.
Guys like you with your bad advice are the primary reason that I get so many buggered up airguns in for repair.


To Woody-to - thank you for the kind words.

can I get a breech & piston seal anywhere in North America?

Give D&L a try. It may not be listed on their website, but try e-mailing them.

 

[trevj]

The breech seal, well, it seemed pretty good with the tissue test, but yea, it's also pretty hard.
The piston seal is plastic. Seemed ok I guess.

Simple thing being, can I get a breech & piston seal anywhere in North America?

If you don't have a CTire electronic caliper, get one next time they go on sale. ~$15. Worth having.

Like as not, the word of the day, is "If it works, don't muck with it", WRT the breech seal.

When it does not work, measure the inside and outside diameters, and contact D&L. Like as not, they will have some idea which one is correct or adaptable, but if it's working, don't muck around.

I have made a few leather breech seals, using a metal lathe, and a mandrel that keeps the leather compressed hard while it gets cut to the correct diameter. PITA, and worth avoiding if you can!

Not rocket science, though.

If there is a single word that defines a springer airgun, it is balance. Too tight a fit is as bad as too loose, too much grease or oil is as bad as too little. All the parts have to work well together to get the optimum performance.

Randomly drilling out the air passage does not always make things better. The piston relies upon the resistance, to slow itself down, when it drops. The end result of too little resistance, is a piston pounding itself to death on the forward end of the compression chamber, usually amounting to a destroyed gun. If you are going to mod it, do so with an eye on cause and effect. Go with caution.

Cheers
Trev

 

[enefgee]

A Slavia air gun actually changed my life. It was the first gun I ever owned (age 8) it's what started me shooting, and basically I've been shooting ever since. Come to think of it, that gun has cost me tens of thousands of dollars in guns and gear over the last 38 years.

 

[leonardj]

I have made a few leather breech seals, using a metal lathe, and a mandrel that keeps the leather compressed hard while it gets cut to the correct diameter. PITA, and worth avoiding if you can!

If you do enough repairs, and fabricating of leather and synthetic seals, this punch set from Lee Valley is well worth the investment:
http://www.leevalley.com/en/wood/page.aspx?p=32189&cat=1,43456,32189

If there is a single word that defines a springer airgun, it is balance. Too tight a fit is as bad as too loose, too much grease or oil is as bad as too little. All the parts have to work well together to get the optimum performance.

Randomly drilling out the air passage does not always make things better. The piston relies upon the resistance, to slow itself down, when it drops. The end result of too little resistance, is a piston pounding itself to death on the forward end of the compression chamber, usually amounting to a destroyed gun. If you are going to mod it, do so with an eye on cause and effect. Go with caution.

Absolutely correct.

 

[lone-wolf]

D&L has piston and breech seal, no main springs.

My question is if there is supposed to be a plastic spacer in the piston, as one dis-assembly shows that there should be one but my airgun did not have it.

 

[trevj]

The plastic spacer may have been added or subtracted at the factory to adjust performance to match a particular country's laws, or simply to keep the performance "as advertised" with the particular batch of springs that they had made or received.

Any product that has a long production run gets changes along the way.

Spacers (to increase the amount of pre-compression) and properly fitted guides (to keep the spring from essentially rattling sideways) are a pretty common tuning step.

At some point, to determine if it should or should not be there , you will have to sort out the time lines involved, as well as where your air rifle fits in to that.

Cheers
Trev