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How to inject MAPP through a Schrader valve?

Post questions and info about hybrid (compressed gas with fuel) powered cannons here. This includes discussion about fuels, ratios, ignition systems, build types, safety, and anything else relevant.
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How to inject MAPP through a Schrader valve?

Unread postAuthor: zomgwtfbbq » Fri Apr 09, 2010 7:38 am

Has anyone injected MAPP through a Schrader valve? I searched the forums for a how-to but couldn't find one.
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Unread postAuthor: Crna Legija » Fri Apr 09, 2010 8:34 am

jsr has used syringe but thats for small amount of gass

you could use a thread on type of conector there use on shock pumps
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Re: How to inject MAPP through a Schrader valve?

Unread postAuthor: SpudFarm » Fri Apr 09, 2010 8:36 am

zomgwtfbbq wrote:Has anyone injected MAPP through a Schrader valve? I searched the forums for a how-to but couldn't find one.

Get one of those tire filling guns and screw the hose off. Then attach it to your metering setup.
If you do that you have a almost universal meter.

The hose from a shock pump is better since it is a "no leak" connector.

Edit: -_- beat me.
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Re: How to inject MAPP through a Schrader valve?

Unread postAuthor: SpudBlaster15 » Fri Apr 09, 2010 11:02 am

SpudFarm wrote:The hose from a shock pump is better since it is a "no leak" connector.


This is what I'd go with. Connect the hose from a bike pump or shock pump to your meter, and you have an easily detachable, leak free method of injecting fuel gas through a schader valve.
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Unread postAuthor: theBOOM » Fri Apr 09, 2010 12:16 pm

Careful with the heat pressure when your pumping in the compressed gases. Also I'm not sure of this but I think I read that you have to "modify" the schrader valve to crack open at a low psi to be able to let the MAPP or whatever gas in
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Unread postAuthor: MrCrowley » Fri Apr 09, 2010 5:14 pm

theBOOM wrote:Also I'm not sure of this but I think I read that you have to "modify" the schrader valve to crack open at a low psi to be able to let the MAPP or whatever gas in

Unless the attachment from the pump has a small stem which forces it open when attached to the schrader.
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Unread postAuthor: theBOOM » Fri Apr 09, 2010 6:05 pm

I also know that JSR modded his pump with some orings to not let any air or in this case MAPP out, when he disconnects this attachment from the schrader, beacuase usally a tiny amount of air leaks out (if your trying to get a hybrid mix in there you can't afford losing that small amount of MAPP or w-e)...Maybe he can tell us where exactly he put these orings.. :roll: :?:
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Unread postAuthor: Mr.Sandman » Fri Apr 09, 2010 9:42 pm

Well for one thing, you could make a cylinder to pump mapp into via modded torch head, then at the end of the cylinder have a schrader adpater with ball valve.
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Unread postAuthor: theBOOM » Fri Apr 09, 2010 9:47 pm

How would this "pumping" take place.. I would say you make a touch meter fueling system... NOW thats pretty awwesome
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Unread postAuthor: Mr.Sandman » Fri Apr 09, 2010 9:50 pm

Well pumped was misused in that sentence but since mapp tanks are 100-150 psi it would surely fit your needs.
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Unread postAuthor: theBOOM » Fri Apr 09, 2010 10:50 pm

Oh these arent my needs... ha it's just something I've always wanted to try with some electronicly actuated diaphram 3 way valves
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Unread postAuthor: Mr.Sandman » Fri Apr 09, 2010 11:11 pm

theBOOM wrote:Oh these arent my needs... ha it's just something I've always wanted to try with some electronicly actuated diaphram 3 way valves
Haha Mapp semi anyone? Well if you wanted to you could make an actual pump for mapp with a floating o ring and what not.
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Unread postAuthor: zomgwtfbbq » Sat Apr 10, 2010 11:15 am

Okay thanks for all the suggestions.

I wonder if the connector and hose from a shock pump could be bought separately, if not it would be quite a waste to buy a shock pump and dissect it just for that.
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Unread postAuthor: SpudFarm » Sat Apr 10, 2010 1:42 pm

zomgwtfbbq wrote:Okay thanks for all the suggestions.

I wonder if the connector and hose from a shock pump could be bought separately, if not it would be quite a waste to buy a shock pump and dissect it just for that.


You can just attach a quick connector from a compressor hose to it and use male fittings and a ball valve on your guns. Makes it more prectical IMO.
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Unread postAuthor: turner » Mon Mar 28, 2011 7:05 pm

if you don't want to buy some special fittings, you could just take the core out and use a syringe.

edit- is 18 days kicking up a dead thread?
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