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Old 09-04-2014, 10:56 AM #1
imped4now
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Modifying valve and ram spring tension

Hey guys, I'm not sure anyone else still even checks this section but we'll give it a shot.

I've got a Rhino spring in the Legend I use most (own 2) and with a dwell of 9ms, I'm still at about 270 psi (verified) to achieve ~285 fps. There are no issues anywhere and no excess friction so that's not a problem.

I'd like to be able to reduce the required pressure to get up to field velocity down closer to 200 psi if possible. I've currently got my valve spring and ram springs compressed in a vice to reduce the rate. The valve spring has been there for about 36 hours and the ram spring about 12 hours. I'm not overly concerned about reducing the maximum ROF since I keep her capped low and only play semi.

My thought process is this--reducing the ram spring tension will require less pressure to achieve the same ram speed when opening the valve, just like going from the stock to Rhino spring. I don't plan on reducing the spring tension by much. As for the valve spring, reducing the tension will increase mechanical dwell, allowing for less pressure and/or less electronic dwell to achieve the same velocity it does now.

I'd like to hear results from those that have done this. Otherwise, I'll report back.
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Old 09-06-2014, 06:03 PM #2
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I frequently come around and check this forum. Don't know who else does lol.

I have no idea if this will work since I don't mess around with guns much. But, if it does, please let us know. Sounds interesting.
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Old 09-12-2014, 11:28 AM #3
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I tested out the Rhino spring recently. Unfortunately, I did not log psi on the HPR.

I chrono'd up to 285 with the stock spring (5 shot average). A simple switch to the Rhino lowered my velocity to around 270 (5 shot average) with no change other than said spring.

Stock v2 internals.
Rhino & stock spring (fairly certain it's a "regular" Rhino spring as he wasn't advertising the ultra light ones when I bought them)

I'm game for testing/tweaking if others are.
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Old 09-15-2014, 08:04 AM #4
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The Rhino spring lowered your velocity? That's interesting and should definitely not be the case....at least logically.
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Old 09-15-2014, 11:13 AM #5
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I've never owned a Legend, but if shooting without a ram spring gives you the highest velocity, then as spring tension decreases, velocity should increase, with everything else staying the same.
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Old 09-15-2014, 02:29 PM #6
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I had a increase in FPS when I switched my spring for the stock one. Had to reduce input pressure by 50 psi to get back down below 300 fps.
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Old 09-15-2014, 02:40 PM #7
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Right.....I've never actually done a before and after comparison at the chrono before. I'll do one with my inline pressure gauge attached.
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Old 09-16-2014, 07:54 AM #8
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Quote:
Originally Posted by imped4now View Post
The Rhino spring lowered your velocity? That's interesting and should definitely not be the case....at least logically.
Yup. Switched it back and forth twice because I thought I was doing something wrong. 2nd time I took 5 or 6 shots to make sure I was reading it right for each spring.

Rhino was great to deal with and it's awesome to have an alternate source for Legend parts. I had ordered 2 rhino springs so I'm eventually going to try the other one to see if my one spring is "off." I'm debating trimming a rhino to tweak the spring resistance, but they work so well in shockers I don't know if I want to risk destroying one.

Oh, dwell on the Legend was the stock 10. CP reg if that matters.
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Old 09-16-2014, 04:18 PM #9
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my rhino spring increased pressure about 50 psi. i had to lower hpr to get back to correct fps.
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Old 09-16-2014, 06:40 PM #10
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Quote:
Originally Posted by 913boyd View Post
my rhino spring increased pressure about 50 psi. i had to lower hpr to get back to correct fps.
Then it increased your velocity, not your pressure. You had to reduce the pressure in order to reduce the velocity after the spring swap.
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