[youtube]https://www.youtube.com/watch?v=N0lCTjNtgHE#]1377 review part 2 CHRONY test[/url]
Well done :-*
Hey Mike that is a good job. :-*
So that project is done and time to start another. Know you have plenty of them in mind so keep us posted.
Carl
Not bad. Which brand/type pellet were you pushing through the chronograph?
i used beeman field target 8.64gr pellets
Nice Mike!
What's next?
i think im gonna start on the 2400 KT next, boss valve to start off or maybe the 2260 or the !!! lol.
With just 10 pumps mike,great numbers..good job :-*
very nice job
really like the brass! :-*
Some day my 1377 will see those numbers, lol, I hope :P
Nice work bro ;)
Just another pic, i kinda like this pic for some reason.
Mike
Have to agree! I love the brass and black. Just makes it look so bada$$ really would love to find some nice black hardwood or good synthetic grips and forearm in a matte black finish. I think that's first priority then going to work on the bling. But that thing looks awesome and apparently functions good as well!
Thanks im very happy the way it turned out.
Mike
That be one beauty of a gun there Mr. Mike. Wow! Nice! The Brass-on-Black looks awesome! We likes! Thanks for sharing it!
~Falcon
Hey Mike.
Your Gun looks great.
pump it up to 20. hehe
Where did you get the adjustable trigger?
Thanks i got all the brass from gmac custom parts. the trigger is real nice.i did polish the trigger at friction points.HaHa i did pump to 12 got up to 746 fps not sure how many pumps it will take.
Mike
Nice, top banana! If you look in the Chrony LCD reflection I can see you pumping it up for the shots! ;D
Congrats!
lol my daughter said the same thing.
I did pump it 15 times and got 798 fps i wonder how many it will take !
Mike
Ugh, you're depressing me lol... I want mine to hit 700 and I'd be happy. I don't see a need to go my higher than 1000 fps with any airgun to be honest. 700 for a pistol(let alone nearly 800!) is absolutely astounding! Isn't the super sonic 1200 fps? That would kill accuracy for such a light projectile. If you have an accurate pistol reliably shooting in the 7's you have a winner in my book!
The only good thing, in my book, about getting higher velocity (FPS) out of an airgun is that it then allows you to use heavier pellets which increases muzzle energy and that gives you higher knockdown power for them thar pesky varmints at longer ranges.
Carl
I also think higher FPS is better for a long shot, will shoot str8 a longer distance.
not to sound like a broken record.
but could you possibly give us a break down of each part you installed and what brand part you used.
And any other tuning you might have done to attain these numbers.
I'd love to get that from mine.
Thanks
Ray
Ray not a problem, the barrel is from a 1760,all the brass and adjustable trigger is from GMAC custom,the flat top piston and valve is from Mellon Air,the stock is from crosman.the wood is from RB grips, oh the breech is from crosman. I think one reason i got such good numbers is the 1377 i used is from the 80s and well broke in.Any help you need just ask.Here is a pic with the scope and wood installed.Gun complete.
Mike
I must be doing something wrong then.
I have a mellonair FTP kit in mine along with a 1760 barrel.
I've also modified the valve by trimming down the valve stem dia. and taking the corner out of the exhaust port and polished the inside. Also changed out the valve spring to a lighter weight one so I could get it to dump 30+ pumps at one shot.
I've also did the poly transfer tube mod.
I must have a leaking o-ring or something.
I don't get anywhere near what your getting.
But I wished I could.
I'm gonna tear my gun down again and inspect those seals and rings.
Thanks
Ray
Ray when you changed your piston and valve did you deber the inside of the tube ? and yes check your transfer port seal.
Mike
Well I tried to.
I thought I did.
But there must be a reason why I can't get that kind of fps.
Ray
Ray, what kind of numbers are you getting? And I must admit Mike's numbers do seem high. Of course he could be using a non lead pellet like maybe a 6 or 7 grain that would give those kind of numbers. What pellets are you using?
Carl
With a 24 inch barrel, 7.9grain CPHP's and like 30 pumps only yielded me a best of 712fps.
And he's getting more than that on only 10 pumps!!!!
Man I'm jealous.
I always wanted to try and break 800fps. if at all possible.
Right now I have converted the same 1377 to a 1322 with a 14inch .22 barrel.
And with 30 pumps and 14.3 grain CPHP's it only shoots them at a best of 525fps.
Oh well, somethings wrong somewhere.
Back to the drawing board.
Thanks
Ray
Personally, I think when some one publishes FPS numbers they should include the pellet weight so we can get a better gauge of what the gun is really putting out.
I have a AS2250XT with a .177 24" barrel running on CO2 that I can get 1106 fps with using Prometheus ThUnder BOLT pellets weighing in at 5 grains. That ain't much fpe but the fps numbers are impressive.
Carl
I have to agree with Carl 100%
Take for example Crosman high Velocity SSP pellets weighing in at only 4 grains. Those pellets aren't even legal in Canada because even a de-tuned crosman can hit 700 fps using those pellets. ;D
Mike you may want to do another test and show us what pellets your using to do these "tests"
Quote from: quickster47 on February 17, 2011, 02:24:22 PM
Personally, I think when some one publishes FPS numbers they should include the pellet weight so we can get a better gauge of what the gun is really putting out.
I have a AS2250XT with a .177 24" barrel running on CO2 that I can get 1106 fps with using Prometheus ThUnder BOLT pellets weighing in at 5 grains. That ain't much fpe but the fps numbers are impressive.
Carl
Hey Carl.
Just in case you were wondering. here's the link for those bad boys: http://www.pyramydair.com/s/p/Crosman_High_Velocity_Super_Sonic_Pellets_177_Cal_4_0_Grains_Hollowpoint_Lead_Free_250ct/739 (http://www.pyramydair.com/s/p/Crosman_High_Velocity_Super_Sonic_Pellets_177_Cal_4_0_Grains_Hollowpoint_Lead_Free_250ct/739)
These pellets are completely outlawed in Canada, unless you have a valid P.A.L. (Possession and Acquisition License) for firearms.
If you read the posts the 5th one T191032 asked what pellet i used,it was a beeman field target 8.6gr pellet.I have no reason to lie and fake a chrony test. So if you dont think its true put up some money and i will prove it.I cant help if my gun has high numbers they all arent gonna shoot the same even if you do the same mods to every 1377 made.like i said i think because it was a old will broke in gun,so the inside of the tube was very smooth this might have something to do with my high numbers. :( ???
Mike
I keep forgetting your running a 24" barrel on that gun. I didn't see a list of upgrades when you posted your pictures in the gallery section "pump gun clan" does your valve have mods? ???
how ever, a lot of "questionable" numbers float around various websites and makes me raise a eyebrow some times? ;)
-Rye
I was only pushing mid 600s with the stock barrel after piston and valve where installed,i gained about 100 fps after i changed the barrel,even i was shocked.
Mike
Quote from: airguns100 on February 17, 2011, 02:34:00 PM
I have to agree with Carl 100%
Take for example Crosman high Velocity SSP pellets weighing in at only 4 grains. Those pellets aren't even legal in Canada because even a de-tuned crosman can hit 700 fps using those pellets. ;D
Mike you may want to do another test and show us what pellets your using to do these "tests"
[youtube]https://www.youtube.com/watch?v=XrmEXw1mA4c#ws]Proof of Chrony test numbers[/url]
Quote from: Crosshairs on February 17, 2011, 03:15:05 PM
If you read the posts the 5th one T191032 asked what pellet i used,it was a beeman field target 8.6gr pellet.I have no reason to lie and fake a chrony test. So if you dont think its true put up some money and i will prove it.I cant help if my gun has high numbers they all arent gonna shoot the same even if you do the same mods to every 1377 made.like i said i think because it was a old will broke in gun,so the inside of the tube was very smooth this might have something to do with my high numbers. :( ???
Mike
I don't doubt you one bit.
In fact, I'm jealous and wished my 1377 would shoot that fast.
I had read where you used 8.6grain pellets.
Which means my gun is even slower than I thought because I was using 7.9grain pellets.
So double whammy on me. You shoot heavier pellets faster than I shoot lighter ones.
I'd be interested in knowing how fast your gun would shoot some 7.9grain CPHP's.
Thanks
Ray
I guess i can do a vid with some lighter pellets,that would be a good test.This thing shoots real flat, 30 yard shot no problem she hardly drops.I think i got lucky with my gun.I just hope my friends here in the forum can do the same with there guns.When you take your gun apart check the inside of the tube make sure you dont have any sharp edges, if you do hone it real smoth and replace your o- rings you might have cut one.
Mike
Thanks Mike.
Like i said, using a 24" barrel and properly tuned valve in conjunction with urethane orings and SSP pellets, FPS numbers can hit well (over 900fps). believe me. ;)
Thats very cool how many pumps do you think i can max out i did pump 15 times or so and almost reached 800 fps it was 790 something lol i wrote it down some place.I took a little bashing from some of the boys at my range,they could not belive my numbers so now they can see them on youtube but not here Ha Ha ;D
Mike
if your using (buna duro 60 orings) i wouldn't suggest pumping the gun past 40, it will either blow out the piston oring or the valves oring.
Duro 75 is a bit more rigid, urethane can be pumped to 60, after that they'll rip. ;D
you should make another video pumping the gun up to 30-40. i'll mail you a few new orings (for free) if they blow out, i promise! just email me your address and i'll send them to you. 8)
I have a bunch of brand new buna duro 60 orings in .177 size (003), .22 (005-006), 006 fit's tighter, and piston/valve (111) and inner valve sized (012)
i pretty much have a bunch of extra's ;)
-Rye.
edit. valves inner is size (012)
Well I did some testing tonight after work.
I took off the .22 barrel and put my 24inch .177 barrel back on my 1377.
With a 24 inch barrel, Mellonair FTP kit, poly-port mod, ported and polished valve internals, lighter valve spring.
Using 7.9 grain CPHP's I got these numbers.
10-pumps = 643fps
20-pumps = 714fps
30-pumps = 742fps
40-pumps = 768fps
50-pumps = 791fps
60-pumps = 808fps
I "FINALLY" broke 800fps , but dang, 60 pumps!!
I don't think so.
Back to the drawing board.
Thanks
Ray
Holy Chit Ray 60 pumps i dont have the balls to pump mine 60 times, but you got some good numbers.Well i guess i will have to try sooner or later.I will to a vid and go only 25 pumps maybe 30 hope she dont blow,the gun that is.
Mike
Sounds like a leaking O-Ring i dont think its pushing all the air into the valve air must be leaking past the O-Ring thats the only thing i can think of,unless you got a bad valve. ???
Mike
Quote from: ray1377 on February 18, 2011, 04:37:25 AM
Well I did some testing tonight after work.
I took off the .22 barrel and put my 24inch .177 barrel back on my 1377.
With a 24 inch barrel, Mellonair FTP kit, poly-port mod, ported and polished valve internals, lighter valve spring.
Using 7.9 grain CPHP's I got these numbers.
10-pumps = 643fps
20-pumps = 714fps
30-pumps = 742fps
40-pumps = 768fps
50-pumps = 791fps
60-pumps = 808fps
I "FINALLY" broke 800fps , but dang, 60 pumps!!
I don't think so.
Back to the drawing board.
Thanks
Ray
i'm surprised it didn't melt the orings at 60 pumps. During hot summer they probably would have. ;D
What bolt are you using? and what oring material?
Check to see if all the air in the valve is being dumped in one trigger pull, if not, you'll need a stiffer hammer spring.
Check:
-pump gun to 20
-pull trigger
-cock gun (with out loading a pellet, and pumping) and pull the trigger again.
if air is released it probably your spring.
let us know.
I only pumped it up to 60 one time.
And yes, the pump tube was a tad warm after all those pumps.
With the stock valve spring installed it used to have air left over when I put in 30 pumps.
I could get like 545fps with the first shot and then without pumping it again, load another pellet, cock it
and get a second shot at somewhere around 450fps.
So yes, I've installed a lighter valve spring and it will dump all 60 pumps.
I can't see how a o-ring can be damaged since it does seem to increase in fps when I increase the number of pumps.
If it was leaking, looks like when the pumps went up, that at some point, the fps would bottom out.
Doesn't it?
Thanks
Ray
Quote from: ray1377 on February 18, 2011, 06:00:14 AM
I only pumped it up to 60 one time.
And yes, the pump tube was a tad warm after all those pumps.
With the stock valve spring installed it used to have air left over when I put in 30 pumps.
I could get like 545fps with the first shot and then without pumping it again, load another pellet, cock it
and get a second shot at somewhere around 450fps.
So yes, I've installed a lighter valve spring and it will dump all 60 pumps.
I can't see how a o-ring can be damaged since it does seem to increase in fps when I increase the number of pumps.
If it was leaking, looks like when the pumps went up, that at some point, the fps would bottom out.
Doesn't it?
Thanks
Ray
(imo) I'm not a big fan of lighter valve springs, i'd machine the valves (check valve) down to soften things up. plus installing a disco hammer spring (discovery) spring will take care of the rest. here's a example of the machined check valve: http://www.crosman-air-pistol-owners-forum.com/board/index.php?topic=1043.195 (http://www.crosman-air-pistol-owners-forum.com/board/index.php?topic=1043.195) page 14 about 6 responses down i took a bunch of pictures in the gallery section of machined brass valves, check valves and stems. AC customs did that.
you might be getting leaks from the transfer port area or the bolt oring. i just had some issues with a bolt i was using, it was allowing air past the bolt oring. i could feel it agaisnt my cheek when i pulled the trigger. another thing thing you can try doing is dusting flour around the breech area (messy) but you'll see where the leaks are coming from, if any.
do you have any photos of your rig? it would help us to remedy your situation Ray
-Rye
edit twice
Haven't thought about machining the check valve.
But as for leaks, I did the flour test between the breech and pump tube.
And it leaked bad, thats why I did the poly tube mod.
That fixed that.
To tell the truth, I never even thought about the o-ring on the bolt leaking.
Guess I should put some flour around that and see what happens.
Thanks
Ray
Well at least were getting somewere with fixing your gun.
Mike
Quote from: ray1377 on February 18, 2011, 02:58:03 PM
I did the flour test between the breech and pump tube.
And it leaked bad, thats why I did the poly tube mod.
That fixed that.
Thanks
Ray
Is the poly tube mod the one where you replace the transport sleeve and seal for a bit of poly tube? I read somewhere the tube can expand and you can lose a few fps by that mod.
I think they need to be cut to perfect size or they will leak,mine is stock.
Mike
Quote from: Oane on February 18, 2011, 08:36:28 PM
Is the poly tube mod the one where you replace the transport sleeve and seal for a bit of poly tube? I read somewhere the tube can expand and you can lose a few fps by that mod.
Quick word of warning.
The poly tube mod is to increase fps. some have had success, some have not. You may just end up having to replace your barrel in the long run.
Early on I gave up on the poly tube modifications. It just never seemed to work for me and each time I tried it leaked.
Now I use .25" stainless tubing with an I.D. of .211. This give plenty of flow and when you get it fitted, it never leaks. It can be difficult to work with and just like the poly tube mod, you need to make sure both ends are perfectly square so you have no leaks. And also just like doing the poly tube mod, you need to open up your valve port and the barrel port to .25".
Carl
Carl how long do you cut yout tube?
Mike
Quote from: Crosshairs on February 19, 2011, 02:52:55 PM
Carl how long do you cut yout tube?
Mike
Mike,
It really depends on the breech and valve I'm using and how deep I've milled the .25" holes. So what I'm really saying is that each one is pretty much a custom fit piece. And unfortunately that is just the nature of the beast when you do custom pieces.
Next time I do one or two I will measure them though.
Carl
Mike.
Here's something you might enjoy reading from last year. http://www.crosman-air-pistol-owners-forum.com/board/index.php?topic=1408.0 (http://www.crosman-air-pistol-owners-forum.com/board/index.php?topic=1408.0)
OK i think i can do that.Thanks for the info guys.
Mike
Quote from: Crosshairs on December 29, 2010, 11:34:12 PM
Just another pic, i kinda like this pic for some reason.
Mike
Hey Mike,
WOW - to drool over :-*
If you don't mind me asking, how much for the whole gig?
I guess about 250.00 bucks for everything
Mike