tank or gun

[Bigal1]

For the past two months I've had trouble getting my velocity below the 300fps. I ended up relacing the small pistion in the mini-reg because it looked scored on the surface to me. That seemed to work for a week or two but now I can't get it below 300 again. The velocity adjust valve is fully closed (all the way clockwise) and I still can't get velocity below 290 and that's above the field limit.

I'm using the same old LP tank I always have.

Just wondering if someone thinks I should troubleshoot the tank or the marker. If it's the marker, what should I try next?

[angelballer4life]

lpr, dwell, if you have a tool kit make sure the minireg is not the problem by putting it on the lpr side, not sure if that will work, but it should

[warpedx]

You could check the tank to see if the output pressure drifted.
Other than that, if your lpr is at a normal psi (mine is at 55) and the dwell is 10 or less, the only thing left is the inline reg or the tank.

[Bigal1]

an update:

I swapped my tank with my son's and no change.

I swapped my son's mini-reg for mine and no change.

I took out the LPR and found one bent shim (i only have one installed). replaced it and no change. LPR pressure is around 55.

I reset dwell to factory and no change.

I have now completely disassembled the marker and found nothing else.

I still can't get velocity below the field limit of 275.

any ideas?

[RangerJoe]

Beats the hell outa me. Thats rlly weird your tried just about every possible idea. Maby put it in the frazer thread.

[Bigal1]

ok, an update.

I've replaced the foregrip, mini-reg, LPR, exhaust valve, ram, pistol grip with circuit board, drop forward and tank.

Still can't get velocity below field limit.

Anybody got a suggestion? MT's have a suggestion?

Would altitude have anything to do with the problem? I'm at 5500 feet above sea level.

[RangerJoe]

How exacly would that cause any differnce?( your alltitude)

[Bigal1]

dunno. all I can say is that when I adjust the marker for sea level and 275fps and then I take it back to 5500 feet, velocity is too high.

[Bigal1]

ok, here's my explanation of why altitude is a factor:

at a lower atmospheric pressure as is the case at higher altitude, the gage pressure of the tank and therefore marker is higher. In simple terms, a lower atmospheric pressure means a higher differential pressure between the tank and the atmosphere meaning the ball will shoot faster.

[Bigal1]

Now it occurs to me that the only thing I haven't swapped out is the 14 way solenoid valve. Anybody think that's the culprit?

[RangerJoe]

I say give it a try wont hurt to try.

[angelballer4life]

that would seem to be the only thing

[esandov]

I know it probably not, but chekck the chrono? It may be. Also whats the velocity for 1st shot and maybe say 3rd shot in a string. It could be 1st shot only. Just trying to figure this out becasue from what I am reading you have pretty much replaced every part of that marker.

[Bigal1]

I know it probably not, but chekck the chrono? It may be. Also whats the velocity for 1st shot and maybe say 3rd shot in a string. It could be 1st shot only. Just trying to figure this out becasue from what I am reading you have pretty much replaced every part of that marker.


I've used the field's chrono and my own and they're both above the limit.

There's a lot of velocity variation but consistently above 290.

I replaced the 14 way solenoid with no effect.

No clue.

Sending to Bob.

[whitepimp259]

Ken is better :)

[MuPpEtMoWeR_569]

ken is also on the other side of the country for him :pirate2:

[Bigal1]

Yesterday was the first opportunity I have had to air up the marker and test it. When I first fired it, I could tell just by the sound it was shooting way way fast. I chrono'd it at 347. However, the velocity adjust screw was a little more than 5 full turns from completey shut and I ended up getting velocity very consistent at about 265 with the velocity adjust screw just under 4 full turns from full shut.

My hat is off to Bob. I don't know what the problem was (and that's a little unsettling but it works) but I'm glad Bob got it working again.

Thanks Bob.:cheers:

[yps]

I had the same prob with my lcd a few years back . It would never crono and it was loud as heck so I had sent it in and they changed the exhoust valve and the marker went back to being a 290fps silent killer