 |  | | | |  | |  |  | 1377 potetial? |  | |  |  | |
 Posted: Thu Feb 07, 2013 5:48 pm |
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| Robw |
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| Joined: 30 Jan 2013 |
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I was just wondering. What is the max speed and fpe that can be
milked out of a 1377? |
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| Posted: Thu Feb 07, 2013 6:48 pm |
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| rsterne |
| Moderator |
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| Joined: 15 Jan 2008 |
| Posts: 2998 |
| Location: Coalmont, BC |
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Depends mostly on the barrel length.... and secondly on how much you want to pump it.... With a stock 10" barrel I'm guessing around 700 fps....
Bob |
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Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since!
Airsonal: Too many to count! |
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| Posted: Thu Feb 07, 2013 6:55 pm |
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| Robw |
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| Joined: 30 Jan 2013 |
| Posts: 441 |
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| How much do you think with a long barrel and hot rodded? |
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| Posted: Thu Feb 07, 2013 7:00 pm |
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| rsterne |
| Moderator |
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| Joined: 15 Jan 2008 |
| Posts: 2998 |
| Location: Coalmont, BC |
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I managed to fire a 7 gr. pellet supersonic using a 24" barrel, a bigger valve, and the pump assembly from a 1400.... It still had the 1377 triggergroup, though.... The gun is now detuned (using a stock valve volume) to ~990 fps (7.8 gr.) at 30 pumps with a 2200 pump assembly, and shoots 500 at only 3 pumps, and 800 at 10 pumps (940 at 20).... Multiply those pump numbers by about 1.5 for a 1377 pump mechanism....
Bob |
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_________________
Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since!
Airsonal: Too many to count! |
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| Posted: Thu Feb 07, 2013 7:15 pm |
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| Robw |
| Veteran Member |
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| Joined: 30 Jan 2013 |
| Posts: 441 |
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Wow! No kidding? I had no idea. I was hoping to get this one up to at
least the high 700s.
I have already done a lot to it that I read about on the yellow forum.
I enlarged and angled the transfer port. I drilled the air entry hole in
the barrel larger and I completely eliminated the little transfer tube that
Crosman calls the transfer port. So now it is pretty much a 3/16"
passage up to the hole in the barrel. I polished the hammer and part of the
main tube that it slide in.
It is now up to 670 fps and is a lot louder like it is putting out a much
stronger air flow. So I think that it will push more barrel.
I have a 20 inch Lothar Walther target barrel ordered for it and am going
to start with 18 inches and work from there. |
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| | | | | | | | | 1377 potetial? | | | | | |
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