What would the tuners out there feel is the ideal transfer port dia.for a .22 Disco in terms of shot count, velocity, noise control?
Thanks and regards, John in N. J.

...I don't think there's much to be gained from modifying the stock porting. However, an HDD will improve shot count and reduce noise substantially.

If you plan on reducing power (e.g., to 12fpe), a smaller port would be helpful. But so would grinding some weight off the hammer.

Steve

Tim has set up Disco's from 12fpe up to 30fpe with very good results on consistency.

Sound wise, I don't think anything other than an attachment on the end of your muzzle is going to make a significant difference in sound control if keeping neighbors happy is a concern.

Even regulated sub 12fpe pcp rifles have a fair amount of muzzle report that would not be considered quiet by any means without a moderator or shroud on it.

Regards,

Tony

Maximum Working Pressure = 2000psi?

Steve

Regulated Fill Tank:

http://www.network54.com/Forum/275684/message/1246025188/Universal+Fill+Adapter

Regards,

Tony

...what MWP means - yet charge PCPs - you definitely need to. I urge you to look it up.

http://www.network54.com/Forum/275684/thread/1246021685/Just+spoke+with+Cameron+Simmons+at++Crosman+Customer+Service-+%281-800-7AIRGUN%29

Steve

You know, convince them to put it on the tube like they did with the Marauder? And put it in their literature?

Then you wouldn't have to keep repeating this over and over and over to folks that aren't buying into it.

If you ever were an engineer in a company like Crosman I should think you'd know that important specifications like MWP are set by Engineering staff, not a Customer Service tech over the phone. Or customers with an agenda. At least that's how I've seen it done......

And maybe you could get them to stop filling the same gun to 3000 psi with the A Team? Safe is safe after all, and MWP should be the same no matter what the stock looks like......

Doug Owen

...of his product is? To each his own, I suppose.

Personally, I'd rather let the manufacturer tell me - as Crosman has re: the Disco - both with crystal clear "DO NOT ... Overfill" verbage in the manual, and via Customer Service in response to a simple question. And in both cases the one and only number mentioned is: 2000psi.

As for continuous attempts to change the subject from the Max. pressure rating of production Discos to imagined "agendas" and different guns and prototype development, I'd say that itself speaks pretty loudly of an "agenda."

Steve

You're the champ at putting words in folk's mouths IMO. I'll let you do it.

And as far as strawmen and other distractions from the topic goes, my hat's off to you again. I won't try to fight over my weight, I'll let readers decide who has an agenda and who doesn't if you'll not distract us and respond to the points you're avoiding:

* Is the tube engraved like the Marauder, and does the manual include the magic words ("Maximum Working Pressure")?

* Is this an Engineering spec? (then where is it published?)

* Why does the factory sponsor the A Team violating this important safety spec? (that is can others do it and still be safe?).

I'm sure you're no more inclined to do so now than before, but I thought I'd ask all the same.

Doug Owen

I can tune a Disco to shoot ABOVE 28 ft lbs on 2000 psi...though you don't get many shots that way.

Transfer port diameter IS one of the things that I use to achieve higher power then a stock Disco.

Steve

designing, making, customizing and servicing various airguns. Been doing this for 3 generations so the experience and knowledge is there. Be wary of the sideline/sideshow operations.

Another outfit that can help you is Roy Weid/Mountain Air that specializes in customizing Crosmans/Benjamins and other air rifles.

The power level/tuning work you are interested is right in their skillset.

Regards,

Tony

Not really a fan of pimping tuners, giving them my money is enough Planning on taking some of theirs soon!

However Tim McMurray, cantankerous as he may often be rumored to be, is actually a gem of a guy if your courteous and polite. I don't know what I was expecting when I called him, but I ended up liking the guy. I had to press a little to get the power I wanted for hunting and he was still a total gentleman.

Wouldn't hesitate to do business again!

Just think old fashioned manners .... and not too much bs.

Mac1 set me up at around 30 ftpds or so and I COULDN'T BE HAPPIER.

I have a Mac1 prepped .22 caliber that I had adjusted to 27 ft/lb by doing nothing more than adjusting the power adjusting screw. I never fill over 2000 psi.
The consistant shot count dropped to about ten shots @ 27 ft/lb and it got loud enough to overide my dust collector.
I have found a sweet spot at 23.4 ft/lb @ 15 and that is where I will leave it.
Twenty very consistant shots and much quieter.

You can get the power you want from a Mac1 prepped Disco but, the shot count will suffer. It is a trade off and depends on what you want from your gun.

I don`t know if this is good or not but i`m satisfied.

[IMG][/IMG

Just for hunting...so only care about 1st 25 shots or so..had this rifle almost a year now..very accurate...

JSB 14.3 GR...

1st string..
1.890.5 FPS
2.902.0
3.907.0
4.904.0
5.907.1
6.908.8
7.915.9
8.912.0
9.911.6
10.903.7

Lo= 890.5
HI= 915.9
AV= 906.3
ES= 25.4
SD= 6.93

2nd string
1.909.4
2.903.6
3.903.3
4.905.7
5.900.9
6.890.2
7.880.2
8.876.2
9.868.2
10.859.4

Lo= 859.4
HI= 909.4
AV= 889.7
ES= 49.7
SD= 17.4

3rd string...
1.853.8
2.842.0
3.831.4
4.822.1
5.809.3
6.798.0
7.778.4
8.762.9
9.742.6
10.723.5

LO= 723.5
HI= 853.8
AV= 796.4
ES= 130.2
SD= 43.6

I have no plans to fiddle around with the power setting to "stretch shot count",as i got exactly what I needed for how I'm going to use this rifle...

40 yards...shooting from sticks...POA on bean can was "blue Frjoles"...group on cardboard..same yardage..jerked one at 10 o'clock..

[IMG][/IMG]

[IMG][/IMG]

[IMG][/IMG]

Bench from bag...51 yards...1/2" ctr-ctr..

[IMG][/IMG]

My point exactly Rich.
He can get the power he wants from a standard Mac1 prepped Disco.
Don`t know about a stock Disco.
I bet John can get the power he wants by just adding a power adjuster and not changing the transfer port.

..IMO, excellant accuracy can be had assuming barrel is up to task....ie crown,etc...and the MAC 1 tune covers all that...

Think mine is shooting close to 26 FPE with JSB 14.3 GR Express...

This is what my stock Discovery is doing for twenty rounds with 16 grain JSBs. Start pressure is 2000, end 1000. It's doing about 22 fpe, rather than the 20 I was looking for, but I see no reason to change anything. It groups really tight and has taken California ground squirrels way on out there.

759.0
777.6
777.8
782.8
786.5
788.9
788.7
790.5
793.5
792.9
793.8
793.7
792.8
793.6
794.0
791.4
788.2
785.2
783.8
771.8

Doug Owen