Tuning Perfect tune at any Reg pressure?

[BlackbirdPS]

Hello Airgunners,

Can the hammer spring be set to an ideal, efficient balance at any reg pressure? Obviously a target pellet speed goes out the window.

For example, reg is 123 bar, now simply adjust hammer spring to most efficient point and done. 

??

 

[Glem.Chally]

Yeah you can do that, then if you're not happy with the speed range of that reg setting adjust the reg accordingly. But that's a good place to start 

 

[BlackbirdPS]

What to look for when tuning be hammer spring only? Pellet speed maxes out?

 

[Glem.Chally]

Yeah like find your max speed then lower it 10% or something. If that's what speed you want great, if too slow then raise the reg.

All about the balance between reg and hammer spring preload.

 

[BlackbirdPS]

thanks so much

 

[elh0102]

The only limitation would be the spring rating. Any spring has a range of compression within which it operates consistently. If the reg was set extremely high or low, then the spring and/or hammer could preclude a balanced tune.....I think.

 

[Motorhead]

Not really .... the resistance a poppet has to opening CHANGES with pressure. When a hammers weight and spring rate driving it are balanced the LIFT of poppet is enough to create the power wanted. BELOW STATEMENT would be "IF" you already had a balanced tune in place.

If pressure "Goes Lower" the poppet opens easier and with equal strike energy from hammer being unchanged WILL OVER LIFT the poppet resulting in longer dwell time and more air use.

If pressure is greater poppet opens harder and will result in a Valve lock trend further pressure is raised. !



What we're talking about with a balanced tune is that the Pressure and Strike energy are balanced on the top of the up slope of the BELL CURVE and not Past it being on the down slope side either ... BALANCED right near the peak of curve at a power level chosen / selected so it balances right there !

ANY CHANGES to Pressure or Hammer strike with Skew the balance point and you won't be balanced any longer. THERE IS NO FREE LUNCH HERE !!

There is a LOT MORE to this and many semi work arounds to get a decent tune established. Some may trend More Air Efficient, Other tunes a tighter ES value.



Scott S

 

[Motorhead]

To further this conversation ...

If reg is set too high and hammer strike is too low running well down the up slope, increasing hammer strike INCREASES POWER TOO and Dwell is not an issue. * This is IF the hammer has the weight and spring energy to overcome opening resistance further ?

If reg is set too low and hammer strike is too high, Increases in hammer strike does nothing but use more air. Decreasing hammer strike actually increases efficiency to a point speed stabilizes and where it starts dropping further IS WHERE the balance actually is at for that pressure.



And SO IT GOES ......

 

[elh0102]

By golly, I knew if folks as ill prepared as me kept trying to answer this, that finally a real tuner would step up! 

Thanks Scott

 

[BlackbirdPS]

thank again for all your feed back

 

[PkShooter]

Finding the optimal reg pressure for the speed we want aside, finding the most efficient spot for a given reg pressure is simply doing as stated about … ie. Increase hammer spring until speed decrease and then back off spring tension slightly 

Of course with any pcp, when bottle/cylinder pressure decreases down to same as reg pressure, then speed will begin to drop and drop significantly 

however, Mubhaur, a ‘tuner’ from Pakistan seems to have found a ‘phenomenon’ where by there’s actually some kind of balance between the varying pcp internals which will still allow you to shoot consistently (within 20fps) even below reg pressure … now figure that one

 

[corny]

Finding the optimal reg pressure for the speed we want aside, finding the most efficient spot for a given reg pressure is simply doing as stated about … ie. Increase hammer spring until speed decrease and then back off spring tension slightly 

Of course with any pcp, when bottle/cylinder pressure decreases down to same as reg pressure, then speed will begin to drop and drop significantly 

however, Mubhaur, a ‘tuner’ from Pakistan seems to have found a ‘phenomenon’ where by there’s actually some kind of balance between the varying pcp internals which will still allow you to shoot consistently (within 20fps) even below reg pressure … now figure that one

My ataman m2r does something very similar at a 130bar reg….if you sat and shot it down to 80-90 bar at 50y, poi wouldn’t indicate where it got of the reg. It’s really quite nice, as u get well past 100 shots. 
I actually couldn’t figure out where the reg was set till I built a tester. As the pcp doesn’t hav a reg gauge 



but as knifemaker said, your getting overlift of the valve when your shooting under the reg pressure. If the tune was balanced with said reg presssure.

So at that point it’s probably not as efficient. And hammer strike will become harsher. 

 

[PkShooter]

Yep even when pressure drops below reg pressure, poi at close range won’t shift much although the fps will drop significantly … at longer ranges, the below reg shots aren’t really useable shots