Author Topic: Disco SSG thread (Read 55676 times))

David Mccann · « **Reply #160 on:** March 18, 2016, 09:13:14 AM »

I will post a link. I had to shorten them a little and reduce head dia a bit , so they would fit the disco tubes holes. Think they were from McMaster Carr. Post later.. cheers

Buldawg76 · « **Reply #161 on:** March 19, 2016, 02:18:57 AM »

David
Sounds good and no rush as if you just have the part number I cam look them up as I have an account with them and they ship to me from Atlanta only two hours away so I have driven to get stuff if I am going to be in the area for other reasons.

No rush

Mike

David Mccann · « **Reply #162 on:** March 19, 2016, 09:29:11 PM »

http://www.mcmaster.com/#91772a189/=11m2xf2 http://www.mcmaster.com/#91400a189/=11m30ku

David Mccann · « **Reply #163 on:** March 19, 2016, 09:39:43 PM »

ive got 90 of the stainless ones. ill drop some in the mail to ya. how bout that??

Buldawg76 · « **Reply #164 on:** March 20, 2016, 03:36:30 AM »

David
PM sent with shipping address and very much appreciated for you generosity.

Mike

wll2506 · « **Reply #165 on:** March 20, 2016, 04:22:00 PM »

Quote from: David Mccann on March 19, 2016, 09:29:11 PM

http://www.mcmaster.com/#91772a189/=11m2xf2 http://www.mcmaster.com/#91400a189/=11m30ku

I bought some the same mil spec ones just last week from McMaster -Carr. I won't be using pressure past 2200, just putting them in for insurance.

wll

Dairyboy · « **Reply #166 on:** March 20, 2016, 05:33:26 PM »

Quote from: wll on March 20, 2016, 04:22:00 PM

Quote from: David Mccann on March 19, 2016, 09:29:11 PM
http://www.mcmaster.com/#91772a189/=11m2xf2 http://www.mcmaster.com/#91400a189/=11m30ku

I bought some the same mil spec ones just last week from McMaster -Carr I won't be using pressure past 2200, just putting them in for insurance.

wll

So these are the same threads as the stock bolts right? Just a drop in? I wouldn't do more than a 2200psi fill either and would be nice if it's the same threads so don't need to drill and tap.

David Mccann · « **Reply #167 on:** March 20, 2016, 05:57:01 PM »

should fit, may have to remove a thread so they will screw down to the head... same thread size and pitch

Dairyboy · « **Reply #168 on:** March 20, 2016, 06:01:16 PM »

Quote from: David Mccann on March 20, 2016, 05:57:01 PM

should fit, may have to remove a thread so they will screw down to the head... same thread size and pitch

Perfect thank you sir for the confirmation

wll2506 · « **Reply #169 on:** March 20, 2016, 06:02:04 PM »

Quote from: Dairyboy on March 20, 2016, 05:33:26 PM

Quote from: wll on March 20, 2016, 04:22:00 PM
Quote from: David Mccann on March 19, 2016, 09:29:11 PM
http://www.mcmaster.com/#91772a189/=11m2xf2 http://www.mcmaster.com/#91400a189/=11m30ku

I bought some the same mil spec ones just last week from McMaster -Carr I won't be using pressure past 2200, just putting them in for insurance.

wll

So these are the same threads as the stock bolts right? Just a drop in? I wouldn't do more than a 2200psi fill either and would be nice if it's the same threads so don't need to drill and tap.

Same threads but a bit stronger ... I would not push the envelope. I have some others coming from Magnum-Air that are supposed to be good to 2500psi ... but I would not push that either. The only really safe screw if you are going around the 2300+ area is using 10x32. I really trust Bob and Lloyd in the testing they do, IMHO there is no one better.

I would love to do it, but I really messed up one valve housing and don't want to mess up any more. I'm ~comfortable with the replacement screws at the psi I tend to use. I have said 2200 is my goal, but in reality it is more like 2000 to 2100.

When I get these screws in and change them, if I can get a good 25+ shots using JSB 15.9 at the 750fps mark .... that it for me ... that's what that gun will do, I'm not going to make an elephant gun out of a mouse gun ! I did the same thing with my QB's, set perimeters and that was it. My hottest QB just got a couple shims (.120 worth) removed because of poor shot count, and if shot count increase and she looses some speed .... that's just hard cheese and I'll live with it. The regulator is set to 1350 outgoing, and I'm not going any higher than that.

wll2506

David Mccann · « **Reply #170 on:** March 20, 2016, 06:08:59 PM »

i will give this gun the 10-32 mod at the next teardown. ive emptied the tube and removed the screws one at a time and inspected them and their holes and the tube. all look like they did when i put it together. screws are straight and threaded holes dont appear to be stressed sideways. ill do the mod anyway.

wll2506 · « **Reply #171 on:** March 20, 2016, 06:13:00 PM »

Man alive, it sure sounds like those stock screws are #$^&@. Have not heard of anyone getting hurt, but lots of folks are not happy about them.

wll2506

wll2506 · « **Reply #172 on:** March 20, 2016, 06:16:07 PM »

Quote from: David Mccann on March 20, 2016, 06:08:59 PM

i will give this gun the 10-32 mod at the next teardown. ive emptied the tube and removed the screws one at a time and inspected them and their holes and the tube. all look like they did when i put it together. screws are straight and threaded holes dont appear to be stressed sideways. ill do the mod anyway.

David, how much shooting did you do with 3000psi in the gun, did you use it a few months or ? just want to get an idea. I just wish I could drill straight, and i was using a jig !

wll2506

David Mccann · « **Reply #173 on:** March 20, 2016, 06:22:41 PM »

i have filled and shot it down 6 times since the build. near 350 shots i would guess. the last 2 fills after the ssg installed, gave me 80 shots from 3000 down to 900 psi...jsb 18.13,.... amazed......... 104cc res

David Mccann · « **Reply #174 on:** March 20, 2016, 06:28:50 PM »

the valve in this disco also has the 2 forward breech screws thru the tube and into the valve.... they are 4-40.. as it has the prod breech fitted.

Buldawg76 · « **Reply #175 on:** March 20, 2016, 06:45:24 PM »

David
Do the two prod breech screws fit tight thru the holes in the tube or did you make the holes bigger than the 4-40 screws like they are in the Prod and Mrod tubes. While they will add some strength to the retention of the valve in the tube just by the fact that there is two additional screws there. Unless they fit the holes in the tube tight like the heads of the retention screws do it is likely only their clamp load of the valve in the tube that is of any benefit but any extra is better than none at all.

I like the idea of the Prod breech on the disco tube, so did you use a prod valve so it already had the breech holes in the valve or did you drill a disco valve for the breech holes as well as the tube.

Mike

David Mccann · « **Reply #176 on:** March 20, 2016, 07:31:20 PM »

yes, used a disco valve. holes drilled and tapped thru the tube and vlv. at same time... so tube has threads too.easy to mess this up, so use caution with that $45 prod breech as you start relocating the forward holes further forward, so the breech screws will hit the meat of the front of the valve. be really easy to drill crooked or break out the side. i was nervous.

Buldawg76 · « **Reply #177 on:** March 20, 2016, 07:56:28 PM »

Yes that's what I was wondering and might be as easy and less nerve racking to just get the prod valve and only have to drill tube. At least with the tube and valve threaded it adds a good bit more support for the valve at the 3000 psi.

Did you buy the breech from crosman direct or aftermarket vendor as I was just curious if that's the price from crosman for the breech. I am thinking of doing the same thing so I can have the barrel shrouded like the prod and mrods are for noise reduction.

Mike

David Mccann · « **Reply #178 on:** March 20, 2016, 08:28:40 PM »

stock crosman breech. the t port on the prod vlv. doesnt match the disco tube. i think i am correct on this. someone else may confirm?

Buldawg76 · « **Reply #179 on:** March 21, 2016, 12:25:32 AM »

David
If the prod valve port does not match the disco tube then how does the prod breech T port line up to the disco valve port or did you have to adjust the placement of the breech on the tube to line up with the T port hole in the disco tube so that you had to drill all 4 breech screw holes in the tube and if so were the holes moved forward or backward on the tube and in the valve. If moved forward then do the two rear breech screws still thread into the end cap or just the tube in the hammer and spring pocket of the tube. I looked at the schematic of a prod and it shows the T port ahead of the valve retention screws versus the disco valves T port being inline with the valve retention screws. So it appears you would have to adjust the breech rearward to line up the T ports of the breech and tube/valve in a disco.

The rear two breech screws in the prod thread into the end cap directly inline with the single disco breech screw hole of a disco end cap as I have several 2240 with a prod end cap that I had to drill and tap the one hole to mount a rear breech screw to from the 2240s to have a prod RVA adjuster.

If the two rear screws are in the end cap for the prod breech I would think the T port is at the same location as a disco valve is but like you am not 100% sure. Very good point you brought up and I just assumed they were the same but according to the schematics they are different.

Anyone out there have one of each they can compare.

Mike

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Disco SSG thread

Author Topic: Disco SSG thread (Read 55676 times))