Dye DFF-20 Lazarus Valve

[flyweightnate]

My understanding, then, is that this indicates a much wider (or smoother, thus wider vena contracta) opening than the other valves? Easier for the air in front of the valve to go straight in, versus "around" a wide cup seal, perhaps.

I'm curious what this does for efficiency. The hammer-spring marker tests seem to be all about opening force, but this is more about flow when open. I bet you could also drop LPR pressure given the autococker main spring tests.

[latches109]

"I can’t see a valve playing a role in it. " - it's back pressure dependent, so whatever happens down stream will affect the dwell. I am curious if the settling time will be affected by the temp drop during sustained rate of fire.

[Hooptie]

Where did you get the set screw with oring? Definitely will have a clean install with that part.

[Roger7pball]

Unfortunately my chronograph can’t record velocities at a decent rate of fire, if I feel the urge to do that test I’ll borrow my buddy’s Virtue Clock.

Consistency at that rate of fire is mainly affected by HPR and LPR recharge rates (on top of the ball to ball shape variation). I can’t see a valve playing a role in it. The seal has 80-90 ms to return to home and unless the valve bounce and settling time is massive I can’t see a 10 bps test exposing anything a 1 bps doesn’t.

I can spit out the STD Dev of the 10 shot strings I did for this test.

[latches109]

did you measure consistency? e.g. was the std. deviation for each valve for a string of 20-50 @10.2bps?

[Roger7pball]

Yes, no variables were changed other than the valves themselves to get a good comparison.

[latches109]

Was the modified hammer used on the ccm and aka valves?

[Roger7pball]

In my mind it makes a difference for markers that have their hammers make physical contact with the valve body (autocockers etc). With my Ehm and Vikings the hammer only contacts the valve pin then stops just short of the body. So I left it out of my install.

There’s a bumper internal to the AKA ram cartridges that stop it at full extension.

[Jordan]

Does the brown "bumper" oring that comes with the valve make any difference whether it's on or off?

[Roger7pball]

Did some compares the other night in an AKA Ehm. CCM and AKA 11/16” valves were on par with each other, with the Lazarus gained 30 feet per second at the same dwell and pressures.

Had to do a little modification to the hammer but very happy with how it shoots. Probably will be installing these in more of my markers.

[Menso]

It fit! Had to steal the valve nut off my T2 and file it down a little as the stock one was too long. Threw in a Jenni Kraig hammer and the main spring it came with. Pump stroke went from ~6.1 pounds to ~3.7(!). IVG flush. Sidewinder set to a little under 200psi. Don’t have a chrono at home but eyeballing it I’m at or around 300fps and the sound signature sounds like a nice clean pop, much more satisfying to the ears than stock. Wild. Can’t wait to hit the field with it.

I only wish I could throw this in my T2.

[Menso]

Let’s hope diddly machining will be required.

[superman]

I know the morph valve would not fit with out having the vert asa piece machined.

[warbosschoppa]

That's the spirit

[Menso]

Anyone know if this would work in an SS-25?

EDIT: I’m going to make it work in an SS-25.