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  #11  
Old 11-12-2017, 07:07 PM
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GalinHdz GalinHdz is online now
 
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Quote:
Originally Posted by gasman View Post
If you are going to use a line that can be pushed onto a barbed fitting, what is wrong with a nylon fitting?
Nothing, I just prefer metal ones inside the firewall area.

Quote:
Originally Posted by TS Flightlines View Post
Galin---we've actually improved on things. Email me and I'll send you a pic.
( Dont know why I didnt think of this before)

Tom
E-Mail sent.
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Last edited by GalinHdz : 11-12-2017 at 07:12 PM.
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  #12  
Old 11-13-2017, 09:16 AM
TS Flightlines TS Flightlines is offline
 
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Default Dual PMag tee

Figured out how to post these.
First pic is the first version. Effective, but ugly, and labor intensive. Set up for 2 PMags. Could cap off 1 port for single PMag. The outlet hose routed to the MAP sensor, or the pressure manifold.

2nd pic. AN Tee with a 910 union to make it a 4 port tee. MANY configurations possible depending on the builder. This particular one has 2 AN826-3D tees with a AN910-1D union. Supply port from the engine, 2 branch ports to the PMags, outlet port to the MAP sensor. WE use teflon hose for the supply and outlet hoses as shown by the AN hose ends here. The 2 branch ports are -3 hose ends and can use the PMag supplied hose, or teflon hose adapted to the PMags. Maybe not as compact as the handmade version, but much easier. The added bonus for guys that initially have 1 PMag with a AN824-3D or 4D tee, you can remove that tee, and install the dual tee, and add 1 hose for the other PMag. This eliminates the need for a new hose assembly, or modifying one that you have.

I chose the -3 version to simplify the plumbing. Alot of guys use -4 hose for the MAP senders. Thats ok too---With a -4 tee, just use a -3/-4 stem to reduce the size for the PMag, or the sensor. The ID of the -3 stem is .079. We havent seen any adverse readings due to line pulses.

WE 'may' decide at some point to make these from 1 piece or bar stock. It would make a more compact unit, and eliminate the union. BUT, for the time being, this is easy. NOT plastic, brass, nylon, and uses threaded connections.




http://i1316.photobucket.com/albums/...ps8sznfctv.jpg

Tom
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Last edited by TS Flightlines : 11-13-2017 at 09:18 AM. Reason: pic
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  #13  
Old 11-13-2017, 09:18 AM
TS Flightlines TS Flightlines is offline
 
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well gee--the other pic didnt insert---HUM
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Teflon Hose Assemblies for Experimentals
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RV7 Tail Kit Completed, Fuse started-Pay as I go Plan
Ridgeland, SC
www.tsflightlines.com
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  #14  
Old 11-13-2017, 09:39 AM
Aircraft Specialty Aircraft Specialty is offline
 
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Tom asked me to post the second picture here.

This is the way that Tom and I do Dual PMAG setups.




We are currently working on a 14A Dual PMAG setup and will post a completed installation picture once setup. As Tom mentioned, we can work in both -3 and -4 and also can use jump size fittings to retain smaller hose while still utilizing some -4 hardware that may already be installed in the aircraft.
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Your Source for Custom CNC parts, CNC cut instrument panels and labeling, Teflon fuel/oil hoses, Headsets, and many other items for Experimental Aircraft.
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  #15  
Old 11-13-2017, 10:10 AM
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I found standard barbed tubing connectors in stainless steel at McMaster-Carr.

You can see it in the lower left corner of the picture.


The tubing is silicon and the little clips also came from McMaster.
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  #16  
Old 11-13-2017, 10:26 AM
TS Flightlines TS Flightlines is offline
 
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Yepp there are lots of ways to do this. Some guys didnt want a barbed connection. Thats why we changed ours to the AN Tees

Tom
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Teflon Hose Assemblies for Experimentals
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RV7 Tail Kit Completed, Fuse started-Pay as I go Plan
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  #17  
Old 11-14-2017, 07:48 AM
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Christer Christer is offline
 
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Default Pulse Damper

I also added a pulse damper in the MAP line to smooth out pressure variations. I used an "Gauge Vibration Damper" from McMaster Carr P/N 3820K12. It has a .008" orifice and has worked very well. My manifold pressures are rock solid which helps in the timing with the P-Mag.
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  #18  
Old 11-14-2017, 08:12 AM
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Toobuilder Toobuilder is offline
 
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I use tees from irrigation dripper lines. Inexpensive, light, and durable. Nothing wrong with plastic in this application - if it fails, who cares?

When I see braided lines and aluminum block manifolds for this I have to wonder if you guys are building airplanes or farm equipment? Think and build light!
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WARNING! Incorrect design and/or fabrication of aircraft and/or components may result in injury or death. Information presented in this post is based on my own experience - Reader has sole responsibility for determining accuracy or suitability for use.

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  #19  
Old 11-14-2017, 08:29 AM
Larco Larco is offline
 
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This is simple and has worked very good for many hours and still like new.
http://www.aircraftspruce.com/catalo...lickkey=169439
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  #20  
Old 11-14-2017, 09:19 AM
TS Flightlines TS Flightlines is offline
 
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Michael, yep thats true. Some extra weight involved for sure, certainly more that a plastic and vacuum hose. Was just the idea of how to plumb 2 PMags and a MAP sensor. Yep--the SDS ignition solves that problem too!
Tom
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Teflon Hose Assemblies for Experimentals
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RV7 Tail Kit Completed, Fuse started-Pay as I go Plan
Ridgeland, SC
www.tsflightlines.com
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