Author Topic: Is regulating my Disco the next step? (Read 11031 times))

rsterne · « **Reply #20 on:** February 05, 2015, 12:28:58 AM »

The hole through the Disco gauge block is very small, and emphasizes the pressure drop in the plenum.... The one for the PRod has a much bigger hole, and not only adds volume, but allows better flow into the valve.... While you don't need huge flow for 12 FPE, that small hole MAY require you to need a bigger plenum....

Bob

UCChris · « **Reply #21 on:** February 05, 2015, 12:40:26 AM »

I told Milo74 that I'd like a 1.5" plenum spacer. I will check on the price of the Prod gauge block; hopefully it is only like $5.

nervoustrigger · « **Reply #22 on:** February 05, 2015, 01:13:29 AM »

Chris, enlarging the hole through the Discovery gauge block should be fairly trivial. No need to buy a PRod gauge block.

rsterne · « **Reply #23 on:** February 05, 2015, 01:16:39 AM »

Not as trivial as you might think, as the gauge adapter seals into the block with an O-ring right next to the 1/8" center hole.... If you try and drill that hole out, you will run into the O-ring seat and ruin the Disco gauge block.... You have to mill it (or grind it out by hand with a Dremel) off center to enlarge the hole....

Bob

nervoustrigger · « **Reply #24 on:** February 05, 2015, 01:21:09 AM »

Ah, I take it this pic from the Crosman EVP is not representative of the real thing? The hole is shown centered.

nervoustrigger · « **Reply #25 on:** February 05, 2015, 01:25:04 AM »

Nevermind, I see the gauge adapter you are referring to. I was thinking the gauge threaded directly into the block with NPT threads.

UCChris · « **Reply #26 on:** February 05, 2015, 09:32:59 AM »

Can I screw my Disco gauge into the Prod block, or are they different threading?

the sloth · « **Reply #27 on:** February 05, 2015, 12:19:35 PM »

Should be the same thread, as the gauge on the Prod threads directly into the block. Also keep in mind that because of its location, your gauge will measure regulated air pressure.

rsterne · « **Reply #28 on:** February 05, 2015, 10:55:31 PM »

Nope, different threads, as the Disco gauge adapter is straight thread into the Disco block, and seals with an O-ring, while the PRod gauge block is 1/8"-NPT (tapered) pipe threads.... HOWEVER, the Disco gauge, without the adapter, will thread right into the PRod gauge block, although it will be quite deep in the stock.... If you want it lower, get a 1/8" NPT male to female adapter from a Hydraulics shop to extend it....

Another way to go would be to have a custom plenum chamber made to replace the gauge block altogether, eliminating the gauge, and with a large bore to get most of your plenum volume that way.... I don't know of anybody selling them, though....

Bob

UCChris · « **Reply #29 on:** February 06, 2015, 12:21:24 AM »

I don't mind it being deep into the stock, so I will just thread the regular Disco gauge into the Prod block. Does the Prod block use the same o-rings as the Disco? I'd assume it does since it seals in the Disco tube...

Milo74 notified me that my regulator shipped today, along with a 1.5" plenum spacer. Should be ready to assemble it by my next day off of work.

rsterne · « **Reply #30 on:** February 06, 2015, 12:55:11 AM »

I believe it does.... Oops, see Norm's post below....

Bob

Norm_m · « **Reply #31 on:** February 06, 2015, 08:19:39 AM »

The Disco gauge block uses 016 O rings and the PRod gauge block uses 113 O rings

Anytime I have ordered either gauge block they have come with the O rings already installed

Norm

darren · « **Reply #32 on:** February 06, 2015, 04:43:13 PM »

Chris, I thought about this when I had a disco......regulator....use as much of the tube volume as you need then double tube it for max shot count..

Powder burner · « **Reply #33 on:** February 07, 2015, 01:29:00 AM »

What do these regulators run price wise?

UCChris · « **Reply #34 on:** February 07, 2015, 02:00:57 AM »

Quote from: Powder burner on February 07, 2015, 01:29:00 AM

What do these regulators run price wise?

$82.70 shipped as of February 2015.

ped · « **Reply #35 on:** February 08, 2015, 06:33:00 AM »

the robert lane reg i fitted to my disco fits in place of the gauge port so you don't have to drill the tube for the bleed hole as it vents through the gauge hole
only down side is getting enough pre chamber i took as much out of the valve as i could to enlarge it
ped

Nick_59 · « **Reply #36 on:** February 08, 2015, 08:40:53 AM »

Same here, but I want to put a gauge in to show the reg setting. I intend to use a Disco block with an Mrod adapter and gauge.

rsterne · « **Reply #37 on:** February 08, 2015, 02:10:52 PM »

I would strongly suggest the PRod gauge block instead of the Disco gauge block, unless you have the ability to enlarge it off-center, you can't just drill it out....

Bob

rsterne · « **Reply #38 on:** February 08, 2015, 02:43:45 PM »

Here is a sketch of an insert that could be made to blank off the gauge port.... It slides in and sits against the front of the valve, sealed by two #016 O-rings....

It would add 3.2 cc of Plenum, and if you add the volume inside the valve, you will have about 6 cc total.... You can then use a piece of thinwall tubing between this and the regulator to increase the plenum to whatever you want.... It the tubing is 0.030" wall (any less and I would worry about it buckling), that works out to a 0.68" ID, which adds 5.9 cc per inch of length.... So, with a 1" spacer you would have about 12 cc total, and with a 2" spacer about 18 cc total.... You can see that you lose reservoir volume pretty quickly as you increase the FPE you expect to get on a regulated Disco....

Bob

UCChris · « **Reply #39 on:** February 22, 2015, 02:57:11 AM »

Okay, I finally got my Prod gauge block from Crosman. I will be working on regulating the Disco this week. A couple questions.

I ordered a regulated gun from a member here. It will do 50 shots at 25-30 fpe. So, I want to bring my Disco all the way down to 6 fpe (7.9 @ 600 fps or so). My goal is a &^^& ton of shots for sparrow popping and plinking. Do you guys think I will need to lighten the disco hammer? I realize that I'm probably going to have to turn the reg setpoint down from 1200 psi close to 800 or so.

Also, the Milo regulator needs a breathe hole drilled in the air tube. What will happen if I run the regulator without the breathe hole?

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Is regulating my Disco the next step?

Author Topic: Is regulating my Disco the next step? (Read 11031 times))