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Old 08-03-2012, 10:41 AM #1
baggedbirds
 
 
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How do I test HPR pressure?

I have searched but haven't found it. I have done the LPR and have the gauge for it. Is there a link? 05 speed

thanks

I know it's probably a noob question. Don't beat me
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Old 08-03-2012, 12:47 PM #2
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Quote:
Originally Posted by baggedbirds
I have searched but haven't found it. I have done the LPR and have the gauge for it. Is there a link? 05 speed

thanks

I know it's probably a noob question. Don't beat me
Stick a macroline hose in your exhaust tube. Make sure the stem goes in the macroline. Cut hose to length inside of your lpr gauge to keep the stem fully closed. Adjust your velocity screw to desired hpr. Adjust lpr. Back to velocity screw to adjust your chrono

You're going to need to change your gauge to a 300psi to read both lpr and hpr.
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Old 08-03-2012, 03:00 PM #3
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ok, so does the macro line hold the valve stem closed? the hammer is still going to hit the stem when its fired right? Im not getting where the air will come from if the stem stays closed, i dont fully understand the inside of this marker
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Old 08-03-2012, 03:37 PM #4
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Originally Posted by baggedbirds
ok, so does the macro line hold the valve stem closed? the hammer is still going to hit the stem when its fired right? Im not getting where the air will come from if the stem stays closed, i dont fully understand the inside of this marker
If you cut the macroline to the correct length, yes, it will stay closed. You're not going to fire it for the hpr setting. Zero out the velocity screw, air up the marker, slowly increase the velocity and watch your gauge until desired setting.
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Old 08-03-2012, 03:39 PM #5
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Air is filling up your exhaust tube. Hammer hitting the exhaust stem will release the air.
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Old 08-03-2012, 04:35 PM #6
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oh, ok.

if I didn't use the macro line would the stock parts and spring not hold the valve closed enough to just remove the front plug and put the gauge in it?
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Old 08-03-2012, 05:39 PM #7
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oh, ok.

if I didn't use the macro line would the stock parts and spring not hold the valve closed enough to just remove the front plug and put the gauge in it?
Forgot 05 speed uses the spring. Leave the stem in and take out the spring and black bobbin.
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Old 08-03-2012, 05:43 PM #8
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Good question. I use my hpr method on my g7 fly. If the black bobbin doesn't go in your lpr gauge, it might work. Just don't fire your marker.
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Old 08-03-2012, 05:47 PM #9
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I will have to look. The concern is the bobbin will cover the hole in the gauge?
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Old 08-03-2012, 06:18 PM #10
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I will have to look. The concern is the bobbin will cover the hole in the gauge?
Hopefully not completely. But try the macroline holding the stem down.
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Old 08-03-2012, 06:20 PM #11
dr.strangelove
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You can just attach the gauge tool to the valve side tube in place of the front end cap (or volumizer if you have one) - the plastic spring guide bobbin won't obstruct air flow to the gauge (if it did, a volumizer would be pointless). As was mentioned though, you will need a higher pressure gauge.

*edit*

There isn't be any reason you would need to use anything to hold the valve stem closed even if you removed the spring and spring bobbin assembly. The pressure in the valve chamber should be more than adequate to seal the valve. Folks have been setting their Magno valve HPR pressure that way since 2008 when the Fly and Magno valve came out. If you leave the spring and spring bobbin in place though, you can go ahead and fire the gun, which makes it convenient if you've adjusted too high and need to vent off air as you adjust lower.

Last edited by dr.strangelove : 08-03-2012 at 06:24 PM.
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Old 08-03-2012, 06:57 PM #12
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So if he fired the marker with just the stem(no spring and bobbin) in the valve with gauge attached, wouldn't that that stem jump(obviously will leave the valve due to hammer hitting it) and unable to sit back down into the valve, cause a massive air leak?
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Old 08-03-2012, 07:31 PM #13
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Oh yeah, you don't want to fire the gun that way (although you can sometimes get away with it if you tilt the gun back a little bit). But as long as you aren't firing it the pressure in the chamber will hold the valve closed. If you've got the spring and bobbin installed you can fire without any issue though.
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Old 08-03-2012, 08:17 PM #14
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great. I completely understand now.

what pressure range should the HPR be?
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Old 08-03-2012, 08:20 PM #15
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200 - 300 psi depending on if you're running a volumizer (and what size it is if you are).
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Old 08-03-2012, 08:28 PM #16
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No volumizer.
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