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  #1  
Old 01-21-2021, 09:03 AM
PhatRV PhatRV is offline
 
Join Date: Mar 2018
Location: Buena Park, California
Posts: 422
Default Suggestion for Manifold Abs Pressure Fittings/Tubing

I need to install the MAP sensor and running a same air hose to the right PMAG on my engine. Unfortunately, I have the Dynon supplied MAP sensor, its inlet port is too large for the small Vans nylon hose in the kit. I also need to split the same MAP air line into the PMAG inlet. Both of the MAP sensor and PMAG have the same hose inlet size which is approximately 1/8".

What is the tubing material and hose connectors you guys use for the MAP sensor? The Vans MAP kit comes with a steel braided hose that connects from the #3 cylinder and has a restricted AN fitting at the other end. The plastic air line connects from this restricted AN fitting to the sensor.

Thanks in advance for any reply.
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  #2  
Old 01-21-2021, 09:38 AM
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bjdecker bjdecker is offline
 
Join Date: Jun 2005
Location: Georgetown, TX
Posts: 533
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I used the 3 port manifold that Van's supplies and connected all the transducers to it.

I had a custom length manifold pressure line made, and ran it parallel to the oil pressure line along the firewall. I fabricated a small tube to run from the VA-168 to an AN fitting on the firewall which has a 1/8 hose barb installed -- Tygon tubing from there connected to the Plasma III ignition boxes.
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2020 RV-14 QB -- Under construction - Tailcone & Empennage Complete.
2018 RV-7 QB -- Built, Flying
2007 RV-7 QB -- Built, Drowned, Resurrected and flying
1998 RV-8 QB -- Started, Sold
1986 Mooney 205SE
1980 Mooney 231

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  #3  
Old 01-21-2021, 09:43 AM
John Tierney John Tierney is offline
 
Join Date: Jan 2006
Location: Vonore, TN
Posts: 433
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I ended up getting a selection of plastic and brass tees and adapter fittings and playing around with locations and assemblies. Got the fittings from hardware stores, auto parts stores, etc.
I used the black rubber tubing supplied by EMag and the Van's sensor manifold as a splitter. See photos.
The terminal block is a 5V bus for the Dynon sensors. The MAP sensor is below the terminal block.
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  #4  
Old 01-21-2021, 10:11 AM
PhatRV PhatRV is offline
 
Join Date: Mar 2018
Location: Buena Park, California
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Thanks for all the pictures. I haven't thought about using the manifold fitting in the Vans FF kit since the braided line is too short from #3 cylinder. I have to check if I can tap the MP from the #4 cylinder.
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RV8 standard build: Empennage 99% completed
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Avionics Installation -- 90%
Firewall Forward -- Prep for cowl install
Electrical -- 90%

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  #5  
Old 01-21-2021, 11:17 AM
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rv8ch rv8ch is offline
 
Join Date: Feb 2005
Location: LSGY
Posts: 3,670
Default MAP hose anf fittings

Here is what i did:

http://www.rv8.ch/manifold-pressure/
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  #6  
Old 01-21-2021, 11:34 AM
lr172 lr172 is offline
 
Join Date: Oct 2013
Location: Schaumburg, IL
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I used silicone vacuum tubing. See no need for braided hose in this application. Get the appropiate sized, brass 1/8" NPT to 1/8" barb fitting (for the cyl) and a brass tee for 1/8" I thought Dynon used the GM map sensor, which has a 1/4" fitting I thought.

Don't use rubber vac hose. It will break down in a few years from the oil mist floating around.
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Last edited by lr172 : 01-21-2021 at 11:38 AM.
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  #7  
Old 01-21-2021, 06:04 PM
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pjc pjc is offline
 
Join Date: Apr 2012
Location: Tampa, FL
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I used an 1/8” NPT to Male AN-4 fitting in cylinder 3, an AN-4 braided hose to a bulkhead fitting (AN-4 to 1/8” NPT) thru the firewall, then an 1/8” NPT to barb fitting and silicone vacuum tubing (the thick wall stuff) from there to the steam gauge. Plastic or brass barb Tees would be a good choice behind the firewall if you have other devices to serve. Parts were most cost effective from Summit, JEGS, Grainger, Amazon. The Van’s manifold will be used FW forward for the MP sender if I upgrade to an EMS.

I also bought a cheap clear in line fuel filter (cleanable) to use as a “gunk trap” on the inside of the firewall to protect the instrument — but haven’t installed it yet.
I got the “clear” (whiteish) silicone tubing expecting fuel/oil staining to be visible if gunk accumulates in the lines.

Peter
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Last edited by pjc : 01-23-2021 at 08:49 AM.
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  #8  
Old 01-21-2021, 10:12 PM
TS Flightlines TS Flightlines is offline
 
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Location: Ridgeland, SC
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We do it differently.
Tom
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  #9  
Old 01-23-2021, 06:05 AM
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Lkitson Lkitson is offline
 
Join Date: Feb 2014
Location: Harleysville, PA
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I used the braided vacuum hose that came with the Van's FWF kit. I connected one end to the #3 cylinder and connected the other end to a 45 degree fitting mounted to a bracket I made and riveted to the firewall. I made a line from aluminum tubing to run from the 45 degree fitting to the sensor manifold block. I put a nipple fitting in the manifold and connected the manifold to the Dynon sensor with Tygon tubing



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Last edited by Lkitson : 01-23-2021 at 06:26 PM.
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  #10  
Old 01-23-2021, 08:35 AM
lr172 lr172 is offline
 
Join Date: Oct 2013
Location: Schaumburg, IL
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Quote:
Originally Posted by Lkitson View Post
I used the braided vacuum hose that came with the Van's FWF kit. I connected one end to the #3 cylinder and connected the other end to a 45 degree fitting mounted to a bracket I made and riveted to the firewall. I made a line from aluminum tubing to run from the 45 degree fitting to the sensor manifold block. I put a nipple fitting in the manifold and connected the manifold to the Dynon sensor.



I would re-think the vinyl tube here. I think you would be surprise to find out how little heat it takes to deform it. Vacuum applications require a much more resilient wall strength than pressure and vinyal at 200* simply won't cut it.

Larry
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