Author Topic: Spring twang... how to cure?  (Read 9366 times)

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Spring twang... how to cure?
« on: August 21, 2007, 01:01:02 PM »
I just got the parts for my shadow today. And I'm eager to put it together but would like to know the best way to eliminate most of the twang/vibration. I have used spring tar but wasn't sure if you just coated the spring or goobered it on. So if some of you can help me out maybe show pics or recommend some things to try id be much appreciated.

Thanks,

Jason

Offline brokenarrowjbe

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Re: Spring twang... how to cure?
« Reply #1 on: August 21, 2007, 01:10:09 PM »
lots of info here http://www.gatewaytoairguns.com/library/Library_MainPage.htm
Charlie won't give away all his secrets, however, their are lots of links and thesearch function is very helpful, John
Chance favors the well prepared

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Re: Spring twang... how to cure?
« Reply #2 on: August 21, 2007, 01:26:46 PM »
So just goober it all over the spring then? Also where is a good place ot get some more tar. I dont have alot left.

Offline CharlieDaTuna

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RE: Spring twang... how to cure?
« Reply #3 on: August 21, 2007, 03:45:56 PM »
The best lube to use for the spring is either heavy tar or velocity tar. I suggest that you never use moly on a spring. In most cases the heavy tar is more than adequate and moly though a good lube in some applications and areas has little or no dampening value.

 Russ Best said it best when it comes to applying heavy tar. You spread it like you are spreading butter on an ear of corn. It should be on the outside of the coils and string slightly from coil to coil. I also determine how much I'm going to apply usually by the geographical area that the owner resides in. I wouldn't worry about the tar getting slung off the spring as much as I would the amount of tar that is there as it gets colder and the lube stiffens up. Heavy tar gets very thick but there is nothing better to use on a spring.
Bob  aka:  CharlieDaTuna
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Re: Spring twang... how to cure?
« Reply #4 on: August 21, 2007, 11:08:04 PM »
Now last question, where can I get heavy tar at?

Offline shadow

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Re: Spring twang... how to cure?
« Reply #5 on: August 21, 2007, 11:31:41 PM »
James Maccari in our Mall. You can get just the tar or get the kit for all airgun lubing need's. Ed
I airgun hunt therefore I am... };)  {SHADOWS Tunes & Camo}  airguncamo@yahoo.com

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Re: Spring twang... how to cure?
« Reply #6 on: August 21, 2007, 11:32:53 PM »
^^ OH thanks much Ed, I forgot about that.

Offline shadow

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Re: Spring twang... how to cure?
« Reply #7 on: August 21, 2007, 11:35:10 PM »
No prob. I just got the whole kit for tuning my babies.Ed
I airgun hunt therefore I am... };)  {SHADOWS Tunes & Camo}  airguncamo@yahoo.com

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Re: Spring twang... how to cure?
« Reply #8 on: August 22, 2007, 12:58:16 PM »
Well I found soem tar from when I got my rebuild kit. I used quite a bit and covered the coils pretty good. Now is there supposed to be a decent velocity drop? I mean like 50 fps? before the gun shot around 880-890's and its prolly around 820-830ish. Its not really a huge problem seeing as the gun shoots pretty smooth now, but just wondering if thats normal.

Offline CharlieDaTuna

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RE: Spring twang... how to cure?
« Reply #9 on: August 22, 2007, 01:49:27 PM »
Unless you have a chrony it's pretty hard to tell. Because of the difference in the feel of the gun, it quite often seems to be less powerful but in reality, it's not.

The heavy tar if used in excess can reduce the velocity, especially in cooler to cold weather. Also, a lot depends on what spring you used and what seal. Another factor could be the seal sizing if needed. If it is pretty tight, it can cause some excessive drag. Also, if you were not careful in the deburring process, you may have nicked the seal. Normally the .177 should be in the 850-860's to the low 900's somewhere depending on the pellet and how it is set up. I don't really like to see them upwards of 920 or so and sometimes detune them to drop them down  a little.
Bob  aka:  CharlieDaTuna
Co-founder of the GTA


HOME OF THE GRT-III TRIGGER
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Home of the NPSS-NP Triggers:  
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E-Mail:  CDT22@Verizon.net

Benji-342 .177 /Brazilian Winchester 800 .22 /Gamo Cadet .177 /Gamo Shadowmatic .177 /Gamo 440 .22 /Gamo Royal .22 /Gamo Whisper .177 /Gamo SK-1 .20 /B-20 .177 /TF-99 .177 /QB-78 .177 /QB-78t .22 /QB-78-(CD) .22 /QB-78-(CJ) .22/QB-78D .22 /Crosman 2240 .22 /Cros 150 .177 /Crosman Back Packer .22 ?Crosman AS 2250 .22 /Daisy Mod 93 .177 /Marksman 2004 .177 /GS 35 .177 /FWB-124 .177 /Custom Marauder .22 /Custom Disco .177


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Re: Spring twang... how to cure?
« Reply #10 on: August 22, 2007, 01:56:00 PM »
Charlie I have a chrony. And it was shootin 790's then each consecutive shot it was going up. And last I seen before the storms rolled in and my light got cut was about 820. I have the crosman spring fronm when I replaced it back in january.

Offline CharlieDaTuna

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Re: Spring twang... how to cure?
« Reply #11 on: August 22, 2007, 02:09:00 PM »
That's starting out pretty slow and I would think there might be a problem. The gain is common and gains as the seal wears into the compression chamber. Did you cross hatch the chamber itself? What seal did you use in it? Did you size the seal to the chamber? What spring did you use? Did you use Macarri's lubes in it? Also, the Crosman spring in my opinion is not the best spring to use and I never use them. Did you use Macarri's lubes in it? Let's see if we can pin it down.
Bob  aka:  CharlieDaTuna
Co-founder of the GTA


HOME OF THE GRT-III TRIGGER
   Website:  http://charliedatuna.com/

Home of the NPSS-NP Triggers:  
            http://charliedatuna.com/NPSS.htm

E-Mail:  CDT22@Verizon.net

Benji-342 .177 /Brazilian Winchester 800 .22 /Gamo Cadet .177 /Gamo Shadowmatic .177 /Gamo 440 .22 /Gamo Royal .22 /Gamo Whisper .177 /Gamo SK-1 .20 /B-20 .177 /TF-99 .177 /QB-78 .177 /QB-78t .22 /QB-78-(CD) .22 /QB-78-(CJ) .22/QB-78D .22 /Crosman 2240 .22 /Cros 150 .177 /Crosman Back Packer .22 ?Crosman AS 2250 .22 /Daisy Mod 93 .177 /Marksman 2004 .177 /GS 35 .177 /FWB-124 .177 /Custom Marauder .22 /Custom Disco .177


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Re: Spring twang... how to cure?
« Reply #12 on: August 22, 2007, 02:13:13 PM »
Ahh aite.. Well not to shure how to size a piston. So no I didnt, I used the stock one in a new tube from gamo. Seal looked fine to me (visually) just checked for cuts or anyhting else I kinda figured that would be a problem. I used moly to lube the piston (not the face just the edges made shure none got in the compression portion of it). It did seem pretty tight when I put it in.

Offline CharlieDaTuna

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Re: Spring twang... how to cure?
« Reply #13 on: August 22, 2007, 02:41:36 PM »
I didn't mean sizing the piston but rather sizing the seal to the chamber when installed on the piston. Some seals do need to be sized. The seal will develope a different wear pattern over the existing one if you used the same one over again and especially if in a different tube. That can cause blowby around the seal. You didn't say what spring that you used or what moly. The moly can make a difference and should be at least 60% and not over 70%. Also, what did you tar the spring with?
Bob  aka:  CharlieDaTuna
Co-founder of the GTA


HOME OF THE GRT-III TRIGGER
   Website:  http://charliedatuna.com/

Home of the NPSS-NP Triggers:  
            http://charliedatuna.com/NPSS.htm

E-Mail:  CDT22@Verizon.net

Benji-342 .177 /Brazilian Winchester 800 .22 /Gamo Cadet .177 /Gamo Shadowmatic .177 /Gamo 440 .22 /Gamo Royal .22 /Gamo Whisper .177 /Gamo SK-1 .20 /B-20 .177 /TF-99 .177 /QB-78 .177 /QB-78t .22 /QB-78-(CD) .22 /QB-78-(CJ) .22/QB-78D .22 /Crosman 2240 .22 /Cros 150 .177 /Crosman Back Packer .22 ?Crosman AS 2250 .22 /Daisy Mod 93 .177 /Marksman 2004 .177 /GS 35 .177 /FWB-124 .177 /Custom Marauder .22 /Custom Disco .177


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Re: Spring twang... how to cure?
« Reply #14 on: August 22, 2007, 02:46:52 PM »
I have the crosman spring I forgot who I got it from on here, he offered a tune kit so i grabbed one he was fairly popular on here a few months ago (offered a nice spring compressor). Not shure what amount of moly is in there.. the tar was spring tar that was included with the kit.

I guess my next question would be where to get a new good spring and seal along with a lube kit.

I seen JM's page for the lubes.. now which spring and seal :)

Thansk so much so far everyone, especially bob for helping to track this down :)