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Homemade HPA v2 engine

Built a BB Machine Gun? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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Homemade HPA v2 engine

Unread postAuthor: wyz2285 » Thu Sep 10, 2015 2:32 pm

Sup.
I had a G&P M4 with broken gearbox for about a year. Even though it wasn't working I got it accessories once a while and it ended up looking very good, a bit too good for just a new gearbox. While I'm not welling to spend >350 on a HPA engine and since it's a DMR build semi only was acceptable.
So, I ended up following a blow forward bolt design I saw here somewhere then added a coaxial piston valve piloted by a homemade 3-way as firing mechanism. The hardest part was definitely the 3-way, but all worked. Blow forward nozzle is the worst functional part, but for a first time attempt I'm happy it all worked, No leak everywhere :shock: not even the 3-way.

Gonna check the FPS later and get a proper hop-up system, this thing needs a hard hop-up to get the bb fly straight.
Oh BTW I'd show you all the components but I REALLY don't feel like open the gearbox again :lol:
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CpTn_lAw wrote::D "yay, me wanna make big multishot pnoob with 1000 psi foot pump compressor using diamond as main material. Do you think wet bread make good sealant? " :D
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Re: Homemade HPA v2 engine

Unread postAuthor: jackssmirkingrevenge » Fri Sep 11, 2015 6:37 am

Very impressive, congratulations!

I guess it's semi-auto only which is a pity but nonetheless, well done!

I've played with PolarStar FE and Jack as well as Valken V12 and the fact that it's electronic makes it relatively easy to optimize but as you say, the price tag is not for everyone.
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Re: Homemade HPA v2 engine

Unread postAuthor: wyz2285 » Fri Sep 11, 2015 7:53 am

The Jack was actually acceptable, and now since yo have played with it, how does the solenoid works? My guess it's a custom 3way.
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CpTn_lAw wrote::D "yay, me wanna make big multishot pnoob with 1000 psi foot pump compressor using diamond as main material. Do you think wet bread make good sealant? " :D
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Re: Homemade HPA v2 engine

Unread postAuthor: jackssmirkingrevenge » Fri Sep 11, 2015 8:32 am

It's nothing more than a compact solenoid valve driving a blow forward bolt. Since you asked nicely, took one apart and took a photo ;)

edit: just to clarify, it's a little bit more complex than that, since the solenoid has two ports that driver forward and backward motion of the bolt, which allows more adjustability in terms of power and efficiency.

jackdisassembled.jpg
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Re: Homemade HPA v2 engine

Unread postAuthor: wyz2285 » Fri Sep 11, 2015 9:47 am

Yeah I know it's like a blow forward bolt without a return spring. So the solenoid must be some kind of 2 postion solenoid. Could you please screw out the solenoid? From the only video I found where it was taken apart, it seemed very interesting, my guess is a coaxial 2 position.
Took mine apart, going to source a solenoid 3-way for it, mechanical not very consistent. It was doing 490FPS with 0.20 already though :D
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CpTn_lAw wrote::D "yay, me wanna make big multishot pnoob with 1000 psi foot pump compressor using diamond as main material. Do you think wet bread make good sealant? " :D
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Re: Homemade HPA v2 engine

Unread postAuthor: jackssmirkingrevenge » Sat Sep 12, 2015 10:31 am

wyz2285 wrote:Could you please screw out the solenoid?


Not for now, this is new stock. We'll have to wait until someone breaks one :D
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Re: Homemade HPA v2 engine

Unread postAuthor: wyz2285 » Sun Sep 13, 2015 8:09 am

I also confused it with the SMP, must say they look very similar though. Wonder whats the brand of the solenoid they used, it's rather unlikely that they made their own...
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CpTn_lAw wrote::D "yay, me wanna make big multishot pnoob with 1000 psi foot pump compressor using diamond as main material. Do you think wet bread make good sealant? " :D
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Re: Homemade HPA v2 engine

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Re: Homemade HPA v2 engine

Unread postAuthor: vng21092 » Sun Sep 13, 2015 5:04 pm

Any way you can make a little sketch of your homemade 3 way pilot internals? Very curious, thanks.
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Re: Homemade HPA v2 engine

Unread postAuthor: wyz2285 » Mon Sep 14, 2015 2:01 am

vng21092 wrote:Any way you can make a little sketch of your homemade 3 way pilot internals? Very curious, thanks.

The name says it all, it's a 3-way valve, just as any other 3 way valves.
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CpTn_lAw wrote::D "yay, me wanna make big multishot pnoob with 1000 psi foot pump compressor using diamond as main material. Do you think wet bread make good sealant? " :D
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Re: Homemade HPA v2 engine

Unread postAuthor: vng21092 » Mon Sep 14, 2015 8:47 am

so basically the same way a slide valve works? but re-configured?
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Re: Homemade HPA v2 engine

Unread postAuthor: wyz2285 » Mon Sep 14, 2015 5:42 pm

Not exactly, even though a slide valve is kind like a 3-way, mine can use all the 3 ports while s slide valve can only use 2.
Image
Now, an update:

It's not nearly useful, but I posted because I own this to dewey-1 :)
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CpTn_lAw wrote::D "yay, me wanna make big multishot pnoob with 1000 psi foot pump compressor using diamond as main material. Do you think wet bread make good sealant? " :D
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Re: Homemade HPA v2 engine

Unread postAuthor: vng21092 » Mon Sep 14, 2015 6:40 pm

Would you say it's kinda like this?

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Re: Homemade HPA v2 engine

Unread postAuthor: wyz2285 » Mon Sep 14, 2015 7:34 pm

No, more like this:
The diagram I posted above shows how the internals work.
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CpTn_lAw wrote::D "yay, me wanna make big multishot pnoob with 1000 psi foot pump compressor using diamond as main material. Do you think wet bread make good sealant? " :D
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Re: Homemade HPA v2 engine

Unread postAuthor: vng21092 » Tue Sep 15, 2015 9:43 am

ahhh ok I get it now. Thanks. I just bought myself one off Amazon to play with, hopefully I could implement it nicely into a new build.
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Re: Homemade HPA v2 engine

Unread postAuthor: wyz2285 » Wed Sep 16, 2015 2:35 pm

Haha :D that's more like it!
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CpTn_lAw wrote::D "yay, me wanna make big multishot pnoob with 1000 psi foot pump compressor using diamond as main material. Do you think wet bread make good sealant? " :D
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