VM68 on HPA?

pinkanese · 01-13-2009, 01:40 PM

I apologize for my lack of knowledge. I am hopefully gettting of of these huge blocks of aluminuminum soon and I was wondering whether or not it would work well on HPA. A friend told me they wouldn't and I have only ever seem them with Co2 so I figured I would ask some people with mor eknowledge.

MacWhorter · 01-13-2009, 01:53 PM

I tried HPA in mine and it seemed to cycle fine, but they definitly seem to favor co2. I haven't fired paint through it with HPA yet so i'm not sure if the velocity will have problems. It Does appear to work, though.

HP_Lovecraft · 01-13-2009, 03:54 PM

Its not a liquid-only gun, like the early Tippmanns, and Icons. Brass Eagles seem to favor liquid as well. The VM68 was probobly the first blowback that ran non-liquid pretty well.

And as a side effect, that means it should run HPA as well too. HPA has slightly less energy then Co2, at the same pressure. The only issue I can think of is the stock valve requires a huge amount of flow. Some regs may act as a bottleneck, and not provide enough backpressure. So, either use a good reg, or add some volume downstream.

VM-onster · 01-13-2009, 07:26 PM

I run both and I found that recently when I got into HPA when I got my ATS gun, that all my vm-68's run better on HPA.

pinkanese · 01-13-2009, 08:23 PM

Cool, thanks for the info fellas!

sparky · 01-13-2009, 08:27 PM

They will run and cycle fine from HPA, but I've had the problem with not getting a good velocity out of a few of mine. You may have to play around a bit to get the velocity up...

pinkanese · 01-13-2009, 08:33 PM

I don't think that wil be any problem for me. My current plans involve....

polishing the internals
milling the hammer
drilling out the valve
srilling an internal E/C
drilling/tapping for a vertical asa
maybe work on the trigger

....so yeah velocity shouldn't be a problem

KingVM · 01-19-2009, 07:01 PM

My VM's run excellent on HPA ... Never had an issue ... I actually prefer HPA as it keeps my velocity spikes down in the summer heat... But as Sparky stated ... You do need to adjust your velocity a bit when you switch from one to the other...

01-13-2009, 03:54 PM	#3 (permalink)
HP_Lovecraft Post Whore Join Date: Aug 2006 Location: Southern Maine	Its not a liquid-only gun, like the early Tippmanns, and Icons. Brass Eagles seem to favor liquid as well. The VM68 was probobly the first blowback that ran non-liquid pretty well. And as a side effect, that means it should run HPA as well too. HPA has slightly less energy then Co2, at the same pressure. The only issue I can think of is the stock valve requires a huge amount of flow. Some regs may act as a bottleneck, and not provide enough backpressure. So, either use a good reg, or add some volume downstream. __________________ www.montneel.com "the evidence strongly suggests that neither Billy nor Adam (Smart Parts) could have invented the electronic paintgun" -Garr M. King, U.S. Judge

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01-13-2009, 01:53 PM	#2 (permalink)
MacWhorter Seasoned Member Join Date: Apr 2008 Location: Cumberland, RI	I tried HPA in mine and it seemed to cycle fine, but they definitly seem to favor co2. I haven't fired paint through it with HPA yet so i'm not sure if the velocity will have problems. It Does appear to work, though.

01-13-2009, 07:26 PM	#4 (permalink)
VM-onster Seasoned Member Join Date: Dec 2007 Location: WestCoast	I run both and I found that recently when I got into HPA when I got my ATS gun, that all my vm-68's run better on HPA.

01-19-2009, 07:01 PM	#8 (permalink)
KingVM Newbie Join Date: Jan 2009 Location: Burlington, ON, CANADA	My VM's run excellent on HPA ... Never had an issue ... I actually prefer HPA as it keeps my velocity spikes down in the summer heat... But as Sparky stated ... You do need to adjust your velocity a bit when you switch from one to the other...