Author Topic: Finally fitted a SS valve in a Maximus .177!!!!  (Read 571 times)

oldpro

  • Hero Member
  • *****
  • Posts: 1218
Finally fitted a SS valve in a Maximus .177!!!!
« on: March 05, 2018, 09:37:05 PM »
 
Today We fitted our SS valve into a Benjamin Maximus.177 to see how it would fair. It really flattened out the shot string. No other parts were installed all we did was swap valves and that’s it.

Created: 03/05/18 09:56 AM
Description: stock Maximus .177
Notes 1: 2k to 1k fill
Notes 2:
Distance to Chrono(FT): 1.00
Ballistic Coefficient: 1.000
Bullet Weight(gr): 16.20
Temp: 39 °F
BP: 30.42 inHg
Altitude: 0.00
#          FPS   FT-LBS       PF
20    706      17.93    11.44   
19    715      18.39    11.58   
18    721      18.70    11.68   
17    729      19.12    11.81   
16    736      19.49    11.92   
15    739      19.65    11.97   
14    749      20.18    12.13   
13    756      20.56    12.25   
12    759      20.73    12.30   
11    766      21.11    12.41   
10    762      20.89    12.34   
9     774      21.55    12.54   
8     772      21.44    12.51   
7     775      21.61    12.56   
6     778      21.78    12.60   
5     778      21.78    12.60   
4     771      21.39    12.49   
3     772      21.44    12.51   
2     783      22.06    12.68   
1     768      21.22    12.44   
Average: 755.5 FPS
SD: 23.3 FPS
Min: 706 FPS
Max: 783 FPS
Spread: 77 FPS
Shot/sec: 0.1
True MV: 756 FPS
Group Size (in): 0.00

Now with SS valve

Created: 03/05/18 02:56 PM
Description: Maximus.177
Notes 1: 2k to 1400psi
Notes 2:
Distance to Chrono(FT): 1.00
Ballistic Coefficient: 1.000
Bullet Weight(gr): 16.00
Temp: 57 °F
BP: 30.27 inHg
Altitude: 0.00
#          FPS   FT-LBS       PF
35    703      17.56    11.25   
34    705      17.66    11.28   
33    707      17.76    11.31   
32    707      17.76    11.31   
31    713      18.06    11.41   
30    712      18.01    11.39   
29    708      17.81    11.33   
28    712      18.01    11.39   
27    713      18.06    11.41   
26    716      18.22    11.46   
25    710      17.91    11.36   
24    713      18.06    11.41   
23    716      18.22    11.46   
22    713      18.06    11.41   
21    710      17.91    11.36   
20    711      17.96    11.38   
19    712      18.01    11.39   
18    709      17.86    11.34   
17    712      18.01    11.39   
16    708      17.81    11.33   
15    708      17.81    11.33   
14    711      17.96    11.38   
13    712      18.01    11.39   
12    714      18.11    11.42   
11    712      18.01    11.39   
10    709      17.86    11.34   
9     712      18.01    11.39   
8     704      17.61    11.26   
7     705      17.66    11.28   
6     706      17.71    11.30   
5     701      17.46    11.22   
4     706      17.71    11.30   
3     707      17.76    11.31   
2     702      17.51    11.23   
1     703      17.56    11.25   
Average: 709.2 FPS
SD: 4.0 FPS
Min: 701 FPS
Max: 716 FPS
Spread: 15 FPS
Shot/sec: 0.1
True MV: 709 FPS
Group Size (in): 0.00
Modify message


 Big jet in valve no other changes from previous test

Created: 03/05/18 04:25 PM
Description: Maximus.177
Notes 1: 2k to 1300psi
Notes 2: SS valve.105 jet
Distance to Chrono(FT): 1.00
Ballistic Coefficient: 1.000
Bullet Weight(gr): 16.20
Temp: 57 °F
BP: 30.25 inHg
Altitude: 0.00
#          FPS   FT-LBS       PF
36    710      18.14    11.50   
35    713      18.29    11.55   
34    717      18.50    11.62   
33    719      18.60    11.65   
32    725      18.91    11.75   
31    720      18.65    11.66   
30    730      19.17    11.83   
29    729      19.12    11.81   
28    729      19.12    11.81   
27    732      19.28    11.86   
26    730      19.17    11.83   
25    730      19.17    11.83   
24    733      19.33    11.87   
23    734      19.38    11.89   
22    733      19.33    11.87   
21    731      19.22    11.84   
20    734      19.38    11.89   
19    736      19.49    11.92   
18    732      19.28    11.86   
17    733      19.33    11.87   
16    734      19.38    11.89   
15    735      19.44    11.91   
14    730      19.17    11.83   
13    732      19.28    11.86   
12    732      19.28    11.86   
11    729      19.12    11.81   
10    724      18.86    11.73   
9     729      19.12    11.81   
8     726      18.96    11.76   
7     725      18.91    11.75   
6     719      18.60    11.65   
5     724      18.86    11.73   
4     722      18.75    11.70   
3     714      18.34    11.57   
2     718      18.55    11.63   
1     ERROR 10
Average: 726.9 FPS
SD: 6.9 FPS
Min: 710 FPS
Max: 736 FPS
Spread: 26 FPS
Shot/sec: 0.1
True MV: 727 FPS
Group Size (in): 0.00
   


  • Mount Shasta Ca.

Christopher

  • Sr. Member
  • ****
  • Posts: 382
Re: Finally fitted a SS valve in a Maximus .177!!!!
« Reply #1 on: March 06, 2018, 02:46:39 AM »
Nice work Travis, those strings looks great......very stable and flat 8).  Does the Maximus and the Disco have the same valve type?

Thanks,
Chris
  • dead end road KY

CraigH

  • Newbie
  • *
  • Posts: 16
Re: Finally fitted a SS valve in a Maximus .177!!!!
« Reply #2 on: March 06, 2018, 06:48:21 AM »
I like the ES on the first SS run.    Is this a Maximus Euro?    Rather low FPS for a Maximus (or am I missing something).
  • Lone Tree, Colorado
Craig

Benjamin Maximus Hunter -Marauder Pistol - Wildfire
1322C SB FTP Prod Trigger 14.6"
2240 Carbine SB Prod Trigger PA 14.2"
2400KT .22 14.6" LW PA
Other 2240's
Crosman 2100 - 1077
Beeman QB78D - Chief - P17
Gamo Urban
Umarex 712 - P.08

mobilehomer

  • Newbie
  • *
  • Posts: 38
Re: Finally fitted a SS valve in a Maximus .177!!!!
« Reply #3 on: March 06, 2018, 07:40:43 AM »
Craig, it's a 16 gr pellet. Look at the fpe. Pretty decent.

Travis, my Maximus Hunter .22 does 770 average for 20 shots with JSB 18.1. What can I expect from the SS? It look like yours lost just a little. I would like more shots with about 28-30 fpe. Is this possible?
Maximus Hunter
4-16X56 UTG
2400KT
Bushnell 3-12X40 AR 223
Trail NP2 .22
UTG 10X50

oldpro

  • Hero Member
  • *****
  • Posts: 1218
Re: Finally fitted a SS valve in a Maximus .177!!!!
« Reply #4 on: March 06, 2018, 08:24:26 AM »
Craig, it's a 16 gr pellet. Look at the fpe. Pretty decent.

Travis, my Maximus Hunter .22 does 770 average for 20 shots with JSB 18.1. What can I expect from the SS? It look like yours lost just a little. I would like more shots with about 28-30 fpe. Is this possible?
Yea it will make way more power if the rifle was ported I just wanted to see what a direct drop in would do. If we open the ports to 160-170 then we will see even longer strings at higher power.
  • Mount Shasta Ca.

CraigH

  • Newbie
  • *
  • Posts: 16
Re: Finally fitted a SS valve in a Maximus .177!!!!
« Reply #5 on: March 06, 2018, 08:34:49 AM »
Craig, it's a 16 gr pellet. Look at the fpe. Pretty decent.

DOH!    The shortcomings of visual impairment.

Glad to see these options from Travis.

(My .22 Maximus runs 886 fps with RWS Hobbies and 860 fps with CPHP 14.3 grains.   Need to relocate those old graphs)
  • Lone Tree, Colorado
Craig

Benjamin Maximus Hunter -Marauder Pistol - Wildfire
1322C SB FTP Prod Trigger 14.6"
2240 Carbine SB Prod Trigger PA 14.2"
2400KT .22 14.6" LW PA
Other 2240's
Crosman 2100 - 1077
Beeman QB78D - Chief - P17
Gamo Urban
Umarex 712 - P.08

mobilehomer

  • Newbie
  • *
  • Posts: 38
Re: Finally fitted a SS valve in a Maximus .177!!!!
« Reply #6 on: March 06, 2018, 08:47:21 AM »
One more, is this the PRod valve?
Maximus Hunter
4-16X56 UTG
2400KT
Bushnell 3-12X40 AR 223
Trail NP2 .22
UTG 10X50

oldpro

  • Hero Member
  • *****
  • Posts: 1218
Re: Finally fitted a SS valve in a Maximus .177!!!!
« Reply #7 on: March 06, 2018, 09:42:09 AM »
One more, is this the PRod valve?
Yes. Its the same mounting position as the Maximus but not the Discovery.
  • Mount Shasta Ca.

Monkeydad1969

  • Global Moderator
  • Hero Member
  • *****
  • Posts: 1961
Re: Finally fitted a SS valve in a Maximus .177!!!!
« Reply #8 on: March 06, 2018, 07:14:56 PM »
Nice work Travis, those strings looks great......very stable and flat 8).  Does the Maximus and the Disco have the same valve type?

Thanks,
Chris

Close, but they have their differences.

Joe
  • Aurora, Colorado
Joe the P-Dawg Slayer!!!!!

Monkeydad1969

  • Global Moderator
  • Hero Member
  • *****
  • Posts: 1961
Re: Finally fitted a SS valve in a Maximus .177!!!!
« Reply #9 on: March 06, 2018, 07:16:54 PM »
What about a power mod for the SS valve in the Maximus, Travis?

Joe
  • Aurora, Colorado
Joe the P-Dawg Slayer!!!!!

Christopher

  • Sr. Member
  • ****
  • Posts: 382
Re: Finally fitted a SS valve in a Maximus .177!!!!
« Reply #10 on: March 07, 2018, 07:07:52 PM »
Nice work Travis, those strings looks great......very stable and flat 8).  Does the Maximus and the Disco have the same valve type?

Thanks,
Chris

Close, but they have their differences.

Joe

Gotcha. Thanks Mr. Monkey....good to see ya back around again.

Chris
  • dead end road KY

Monkeydad1969

  • Global Moderator
  • Hero Member
  • *****
  • Posts: 1961
Re: Finally fitted a SS valve in a Maximus .177!!!!
« Reply #11 on: March 07, 2018, 10:07:55 PM »
Nice work Travis, those strings looks great......very stable and flat 8).  Does the Maximus and the Disco have the same valve type?

Thanks,
Chris

Close, but they have their differences.

Joe

Gotcha. Thanks Mr. Monkey....good to see ya back around again.

Chris

 ;)
  • Aurora, Colorado
Joe the P-Dawg Slayer!!!!!

oldpro

  • Hero Member
  • *****
  • Posts: 1218
Re: Finally fitted a SS valve in a Maximus .177!!!!
« Reply #12 on: March 07, 2018, 10:23:01 PM »
What about a power mod for the SS valve in the Maximus, Travis?

Joe
20ft lbs in a .177 with 2k fill is pretty powerful
  • Mount Shasta Ca.

Monkeydad1969

  • Global Moderator
  • Hero Member
  • *****
  • Posts: 1961
Re: Finally fitted a SS valve in a Maximus .177!!!!
« Reply #13 on: March 07, 2018, 10:31:47 PM »
What about a power mod for the SS valve in the Maximus, Travis?

Joe
20ft lbs in a .177 with 2k fill is pretty powerful

I'm curious because I have a Cothran powered Disco pushing Piledrivers over 40+fpe, with a stock spring.  I changed to a shorter, slightly heavier spring and two o-rings on the back of the valve, no rva and I average 914fps/39fpe. This is with the .180 valve exhaust.  My fill is 3000-2000.  At 2000 I get 874fps/35.63fpe.  At 3000 I get 954fps/42.45fpe.  It will take P-Dawgs out to 150yds.  With this setup I get 10 shots.  Not mind blowing, but expected.  Also the spread is huge, but not tuned for a bell curve.

Will your valve give me those numbers?  I've become power hungry with the small bores... Lol

Thanks,

Joe---by the way, here's my numbers.

Created: 01-15-2018 10:14:49 PM
Description: Cothran Disco 2 o-ring mod
Notes 1: Piledrivers
Notes 2: 3000-2000
Distance to Chrono (FT): 1.00
Ballistic Coefficient: 1.000
Bullet Weight (gr): 21.000
Altitude (FT): 5280.0
Temp: 8 °F
BP: 24.81 inHG
Shots
#     FPS        FT-LBS     PF
10    874        35.63      18.35     
9     879        36.03      18.46     
8     891        37.02      18.71     
7     899        37.69      18.88     
6     911        38.71      19.13     
5     920        39.47      19.32     
4     928        40.16      19.49     
3     935        40.77      19.64     
2     946        41.74      19.87     
1     954        42.45      20.03     
Average: 913.70
StdDev: 27.66
Min: 874
Max: 954
Spread: 80
True MV: 913.80
Shots/sec: 0.09
Group Size (IN): 0.00
« Last Edit: March 07, 2018, 10:55:36 PM by Monkeydad1969 »
  • Aurora, Colorado
Joe the P-Dawg Slayer!!!!!

oldpro

  • Hero Member
  • *****
  • Posts: 1218
Re: Finally fitted a SS valve in a Maximus .177!!!!
« Reply #14 on: March 08, 2018, 10:12:27 PM »
That’s a .22 isn’t it Joe
  • Mount Shasta Ca.