GTA
Airguns by Make and Model => Crosman Airguns => Topic started by: Wepster on February 20, 2019, 06:32:33 PM
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Hi,
I am pretty new here, when I search 1377 trigger I get 14 pages of results, so I will just ask...
I pumped up my 1377 to 8, and discovered (usually just do 3 or 4 in the garage) the trigger pull and feel were vastly improved! Is that normal? Or is there something wrong? I liked it but wondered...
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My experience is just the opposite. The trigger pull gets heavier with more pumps. This has never made any sense to me as the hammer spring/sear-to-hammer pressure is in no way affected by the valve pressure.
Or is it somehow?
I'm anxiously waiting for an answer, as are you.
Welcome to the GTA, BTW. :D
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This is a good question & I'm curious to read what the experts have to say. I think it has something to do with increases in air pressure on the sear against the valve to keep it shut, which I assume is then transferred to the trigger. If this is true then the trigger pull will increase.
I checked my guns for changes in trigger pull but none showed significant changes. Not sure about a 1377.
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On a 1377, the hammer is cocked rearward against a spring and held in place by the sear. The pressurized valve is completely separate from the hammer - nothing but air in between. The only interaction between the two is when the hammer is released to move forward and hit the valve pin.
(Pic borrowed from here - https://www.crosman-air-pistol-owners-forum.com/board/index.php?topic=5631.0 (https://www.crosman-air-pistol-owners-forum.com/board/index.php?topic=5631.0))
(http://i437.photobucket.com/albums/qq93/JUSTJOHNY/1377cutawaymoded2.jpg)
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On a 1377, the hammer is cocked rearward against a spring and held in place by the sear. The pressurized valve is completely separate from the hammer - nothing but air in between. The only interaction between the two is when the hammer is released to move forward and hit the valve pin.
(Pic borrowed from here - https://www.crosman-air-pistol-owners-forum.com/board/index.php?topic=5631.0 (https://www.crosman-air-pistol-owners-forum.com/board/index.php?topic=5631.0))
(http://i437.photobucket.com/albums/qq93/JUSTJOHNY/1377cutawaymoded2.jpg)
A good thing I started my comment with;"I think". :-[
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I would not even dare to speak about Benji's though. ;)
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It is possible that the air pressure in the headspace between the piston and valve pushes hard enough to warp the airtube and frame so the trigger pull feels different when the gun is pumped up.
I have a C9A that I can see the front sight drop when the shot releases, and a Daisy 856 that warps drastically sideways when under pressure.
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Mine feels better with more pumps, the others say worse, or harder. Mine is stock but I have added the dovetail adapter and a 2x scope. I do still have the plastic, ahmm, synthetic breech, so perhaps Dan is correct.
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Hrm, I have never noticed any difference in my 1322 be it 3 pumps or 12 :o
I like the comment in that picture "Wrap this piece in Teflon tape or it will leak" That is the transfer port and yea it does leak a little. I have the enlarged port though. Only reason I know is it bleeds a tiny bit of oil right there.
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Interesting question/topic.
I have never noticed a difference. As already stated, the hammer spring affects trigger pull, the pressure in the valve is not placing anything in contact with the trigger assembly. ???
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As I mentioned before, I have one 1377 and three 1389's. All have the same trigger setup with very minor differences in the hammer, but all work on exactly the same platform. All four guns have a (very expensive, but nice) MagnumAirPower trigger blade, a Super Sear (on the 1377), polished OEM sears on the 1389's, and polished hammer faces. All four have lighter springs with a nylon insert to keep the spring straight. Pretty much every mod one can do with the exception of an adjustable spring mechanism (which I find overpriced for what they do). The 1377 also has a power adjuster to adjust the hammer force.
Having said all this, I've always wondered if the heavier pull was not merely a perceived difference due to the intense concentration (at least for me) of firing on a target bull. It's one thing to pull the trigger somewhat casually on an un-pumped gun and it's another thing when you know that the shot must count with a pumped up "it's gonna fire a projectile" gun.
SO, I just took one of my 1389's and my 1377 and did a test with my shiny new Lyman digital trigger pull gauge. I did the test without pumping, and with 10 pumps. I did three tests each to get an average, and guess what?.......
The gauge showed NO difference between pumped and un-pumped.
That tells me that it's all in my head. ::)
It still bugs the heck out of me though.