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| TwitchTheAussie |
 Posted: 01/30/2011 6:46 AM Post subject: |
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Brigadier General
Joined: 06 Feb 2007
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JSR pinching things from your workplace and "borrowing" from friends doesn't count sorry  |
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| linuxexorcist |
| Posted: 01/30/2011 11:22 AM Post subject: |
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Corporal
Joined: 30 Mar 2008
Posts: 62
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alright let me rephrase that:
less than $50 for a medium bore hybrid? I think that's awesome.
Although, i think what really brings up the price of a hybrid is the metering system.
And being "resourceful" and pinching things from the lab is reasonable, there's a house under construction across the street from me and i'll admit i've helped myself to the scrap pile a few times |
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| Crna Legija |
| Posted: 01/30/2011 20:55 PM Post subject: |
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shots shots shots
Joined: 20 Jul 2008
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| lol i guy i know built his hole house on his farm from left over from other houses hes built. |
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| Zeus |
| Posted: 01/30/2011 22:27 PM Post subject: |
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Major General
Joined: 27 Oct 2009
Posts: 1324
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In regards to the barrel, if I had an old shotgun barrel around, I'd be using it for a project which puts 300 grams of lead downrange every second. I appreciate the input though.
Once I get off my rear end and finish it, fueling will be a large syringe (horse arse type), that will suffice for up to 10X mixes. That should only cost $2.
I spent another $5 on a 1/4 brass plug and 1/4 to 1/2 bushing for the shrader.
Would one trust a soldered joint holding a shrader, it's a hollow plug filled with solder? |
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| jackssmirkingrevenge |
| Posted: 01/30/2011 22:35 PM Post subject: |
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aspiring machinist
Joined: 15 Mar 2007
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| TwitchTheAussie wrote: | | JSR pinching things from your workplace and "borrowing" from friends doesn't count sorry |
Fine, the stainless steel sections were offcuts from work, as were most of the threaded fittings, but still 
| Quote: | | fueling will be a large syringe (horse arse type) |
Technically it's combustible gas under pressure, so a natural hybrid mix |
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| linuxexorcist |
| Posted: 01/30/2011 23:50 PM Post subject: |
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Corporal
Joined: 30 Mar 2008
Posts: 62
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If you have access to a tap set, experiment a little, schraeder valves from bike tubes take well to a 1/4-28 NF thread in my experience:
Soldering it should be fine, just make sure the hole is a tight fit, and remove your valve core so you don't melt it |
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| jackssmirkingrevenge |
| Posted: 01/31/2011 3:28 AM Post subject: |
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aspiring machinist
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| linuxexorcist wrote: | | Soldering it should be fine, just make sure the hole is a tight fit, and remove your valve core so you don't melt it |
Same with proper epoxy, proven up to at least 28x  |
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| Zeus |
| Posted: 01/31/2011 17:32 PM Post subject: |
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Major General
Joined: 27 Oct 2009
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I looked into tapping, I only had access to metric tap & die set which didn't have the appropriate size.
I drilled the hole 0.5mm too small then turned down the shrader in a drillpress with steel wool.
I'm revising what mix I'll run it at, 10X is looking good at the moment.
Also I used epoxy in the spark gap, it was going to be the shrader but it leaked, now it seals perfectly. |
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| ramses |
| Posted: 01/31/2011 19:48 PM Post subject: |
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Major General
Joined: 29 May 2008
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| Zeus wrote: |
I drilled the hole 0.5mm too small then turned down the shrader in a drillpress with steel wool.
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How many hours did you spend doing that? Next time, I recommend a file or coarse sandpaper. |
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| Zeus |
| Posted: 02/01/2011 4:14 AM Post subject: |
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Major General
Joined: 27 Oct 2009
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0.5mm of brass goes away fairly quickly at high speeds, I was holding the steel wool on the shrader with pliers so it ground down quite fast.
I did it initially to remove the rubber completely so the solder took properly but it worked well so I kept at it. |
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| Crna Legija |
| Posted: 02/01/2011 7:45 AM Post subject: |
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shots shots shots
Joined: 20 Jul 2008
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| what are you using as a spark plug, if you go out and buy a NGK CR10EK spark plug(used in dirt bikes) the threads on it fit perfectly with a 1/8'' npt tap. |
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| Zeus |
| Posted: 02/01/2011 17:18 PM Post subject: |
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Major General
Joined: 27 Oct 2009
Posts: 1324
2955.16 Spud Bux
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I'll look for those, it should fit into a 1/4 to 1/8 bushing and seal better than my other options.
Just need a 1/4 ball valve so I can get rid of the big mofo 1/2 I'm using for testing. |
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