What are the best "must do" Daisy 880 mods?



Author Topic: What are the best "must do" Daisy 880 mods?  (Read 38788 times))

Offline Rob M

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Re: What are the best "must do" Daisy 880 mods?
« Reply #260 on: September 01, 2016, 12:13:19 AM »
thats cool either way.. what do ya mean by sanding the valve? i think the gun has lots of potential , and i have some revisions for tommorow and install a different piston, hoping to hit 880 with premiers.Ultimately , the long stroke conversion is the only way to get serious power from this gun on 10 strokes.
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Offline Dave180

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Re: What are the best "must do" Daisy 880 mods?
« Reply #261 on: September 01, 2016, 12:19:20 AM »
I grinded and sanded this piece.  It may not be a good idea though.  It does weaken it.  The flat top part.

http://www.ebay.com/itm/Daisy-Powerline-880-7880-35-Abutement-Washer-Pump-Tube-Seal-BB-Pellet-Air-Rifle-/151222795782?hash=item233594be06:g:LkEAAOSwO~hXIhTi
« Last Edit: September 01, 2016, 12:23:03 AM by Dave180 »

Offline Rob M

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Re: What are the best "must do" Daisy 880 mods?
« Reply #262 on: September 01, 2016, 12:26:45 AM »
that part shifts with the spring either way, u may have gained some swept air either way and its not a structural part. Ive done some other experiements but for the adjustble piston ive kept the gun stock to see whats possible with basic install. One thing im noticing is that the shorter the piston , the faster it seems to build pressure but that i wont be able to test till tommor after i patch the pump arm.. I have a metal one en route so that wont be an issue anymore
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Offline Rob M

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Re: What are the best "must do" Daisy 880 mods?
« Reply #263 on: September 01, 2016, 12:32:25 AM »
were it not for the steel frame surrounding the tube id simply do a 1 inch tube , piston to fit and call it a day.. that would be huge gains.. but aside from that the long tube is the only viable option.But with the long tube comes the complexity of getting the pump geometry just right both back and forth
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Offline Dave180

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Re: What are the best "must do" Daisy 880 mods?
« Reply #264 on: September 01, 2016, 09:37:26 AM »
Where do you get this longer tubing?  What size is it?  I think I could squeeze out some more by just filing the linkage.

Offline Rob M

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Re: What are the best "must do" Daisy 880 mods?
« Reply #265 on: September 01, 2016, 11:36:25 AM »
ebay or any metal supply.. if u cant machine it the easiest way is to get 7/8 tube with .065 wall for .745 id .. thats about .010 bigger than stock.. making use of another 1 would be a huge gain ( 20%)
the steel would need to be machined down from 1 inch ( 1 inch .134 wall is .732 id ) ..heres the aluminum
http://www.ebay.com/itm/201581699803?_trksid=p2060353.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT
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Offline Rob M

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Re: What are the best "must do" Daisy 880 mods?
« Reply #266 on: September 01, 2016, 11:37:59 AM »
now keep in mind the o.d on thaat is .875 whereas stock is .815 , so thats the 60 thou difference you may have to figure out.. I was just gonna turn it down to 830 ish for a snug fit , but need to do more chrony testing with the stock tube first
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Offline Dave180

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Re: What are the best "must do" Daisy 880 mods?
« Reply #267 on: September 01, 2016, 12:37:43 PM »
So your saying that the original id tube is .735 and the new one would be .745?  That seems to be a big difference for oring sealing. 

Looking at it again, I see it's tapered on the inside also.  I think I'll pass on this since I don't have a lathe.
« Last Edit: September 01, 2016, 01:17:41 PM by Dave180 »

Offline Rob M

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Re: What are the best "must do" Daisy 880 mods?
« Reply #268 on: September 01, 2016, 02:42:34 PM »
thats why i found the .732 also , but yes.., having a lathe may be key. the .010 is tiny and would be sealed by the original oring and if not a size up would seal it.I dont see the taper u speak of at all??
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Offline Rob M

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Re: What are the best "must do" Daisy 880 mods?
« Reply #269 on: September 01, 2016, 02:44:42 PM »
the .732 is ideal , and would fitr perfectly but would still need to be turned down to .830 ish to fit the steel frame.with that tube the stock piston and orings would function the exact same. if i decide to go that route and turn 12 inches of it ill be sure to send u 6
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Offline Dave180

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Re: What are the best "must do" Daisy 880 mods?
« Reply #270 on: September 01, 2016, 03:56:35 PM »
The tapering is in the front 5/8" of the tube where the o-ring goes in so it doesn't get cut.  I measured it with a telescoping gauge. Once clear of the slot,  then no more taper.

Offline Rob M

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Re: What are the best "must do" Daisy 880 mods?
« Reply #271 on: September 01, 2016, 04:03:28 PM »
yep.. JUst did a write up on the american gate, 895fps with 7.9 premiers. reliably 875-889fps
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Offline Rob M

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Re: What are the best "must do" Daisy 880 mods?
« Reply #272 on: September 01, 2016, 04:04:16 PM »
the long stroke kit is needed, to hit those numbers at 10 strokes which would be ideal ( 392 power in a 880 powerline LMBO
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Offline Yng@hrt

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Re: What are the best "must do" Daisy 880 mods?
« Reply #273 on: December 11, 2016, 10:13:38 AM »
Youdidn't hardly step that hammer at all. If you go wayback in the thread, page 2 maybe, and you will see bigtinboat and I discussing this. You can clearly see the angle in yellow on one of Robs posts.

  That is beautiful, but you didn't do much at all to reduce the trigger travel.

Can the hammer step & credit card shim be used in tandem. Or is it one or the other?

Thanks

Never mind. Dumb question!
« Last Edit: December 11, 2016, 10:45:24 AM by Fife »
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