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Connecting Manifold pressure lines

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Stepclimb

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I hope someone can help me with this. My existing Manifold pressure line is 1/4 in nylon tubing. I am installing an insight G3 analyzer which has an AN-2 male flare fitting. Normally AN-2 would connect to aluminum tubing of 1/8 in OD.

I can tee off of the nylon tubing and run 1/4" OD nylon tubing to the insight G3, but I'm stumped on how to connect the 1/4" OD nylon to an AN-2 male flare. After searching Spruce for options, I can not find any elegant solutions.

Any ideas ( perhaps with part numbers from spruce or others)

Thanks!
 
Welcome to VAF!

Drew, welcome aboard the good ship VAF:D

Are you using the primer port in a head to source your manifold pressure???
 
Last edited:
Thanks Mike!

I'm not sure what you mean about a primer port. From the Lyc IO-360, I've got 1/4 " Nylon tubing running to my analog MP instrument.

I see several manufacturers make brass tee's for 1/4" nylon, but I can't figure out how to get 1/4" nylon tubing to mate to the male AN-2 flare on the back of the G3 instrument.

I had thought of putting together an AN-2 nut and flared 1/8" aluminum tubing, but the 1/8" OD aluminum is considerably smaller than the ID of the 1/4" nylon.

I don't want to introduce a leak in the MP sensing system.
 
Stepclimb said:
Thanks Mike!

I'm not sure what you mean about a primer port.
Click to expand...

The primer port is where the brass fitting with copper tubing is attached in this photo.

primer.jpg
 
Ok..now I see....in my setup. .the cylinder fitting is 1/8 NPT to AN4 45 degree elbow then 1/4 aluminum tubing...then when it enters the cockpit, there is a fitting that converts from AN4 flare to 1/4 in nylon tubing. The easiest tubing to access under the panel is the 1/4 OD nylon.

I just can't find an elegant solution to join 1/4" OD nylon tubing to a male AN-2 flare....

Drew
 
Stepclimb said:
I hope someone can help me with this. My existing Manifold pressure line is 1/4 in nylon tubing. I am installing an insight G3 analyzer which has an AN-2 male flare fitting. Normally AN-2 would connect to aluminum tubing of 1/8 in OD.

I can tee off of the nylon tubing and run 1/4" OD nylon tubing to the insight G3, but I'm stumped on how to connect the 1/4" OD nylon to an AN-2 male flare. After searching Spruce for options, I can not find any elegant solutions.

Any ideas ( perhaps with part numbers from spruce or others)

Thanks!
Click to expand...

Take a look at this. Larry
http://www.aircraftspruce.com/catalog/hapages/primertee2.php?clickkey=194657
 
Stepclimb said:
... I had thought of putting together an AN-2 nut and flared 1/8" aluminum tubing, but the 1/8" OD aluminum is considerably smaller than the ID of the 1/4" nylon...
Click to expand...

I'm guessing that the AN fitting is not simply threaded into the G3 analyzer with NPT?

So how about using some heat shrink sleeve on the -2 aluminum hard line so that it makes a nice snug fit inside the 1/4 inch nylon. A couple turns of safety wire as a hose clamp should seal it up nicely.
 
Rather than a conversion to Nylon, can you run aluminum all the way, using a bulkhead feedthrough at the firewall. Think carefully if a failure or leak in the tubing will cause a failure in one of the cylinders.
 
Toobuilder said:
I'm guessing that the AN fitting is not simply threaded into the G3 analyzer with NPT?

So how about using some heat shrink sleeve on the -2 aluminum hard line so that it makes a nice snug fit inside the 1/4 inch nylon. A couple turns of safety wire as a hose clamp should seal it up nicely.
Click to expand...

Michael,

Thanks! I had not considered heat shrink, but that might just do the trick.

For the life of me, I don't know why Insight used an AN-2 male flare. It would have been easier if it was female NPT. I have not tried to remove the AN-2 fitting. I am concerned it may have sealant on the threads or a nut on the back(inside the instrument)that I don't know about.

Instead of safety wire, I might use 2 small cable ties to cinch down the nylon over the heat-shrinked hard line.
 
Stepclimb said:
Hi Larry,

I saw that tee, but was concerned that the description mentioned that the larger two barbed fittings were for 1/4" ID fuel line. My nylon MP line is 1/4 OD with .050 wall. I don't think the nylon is flexible enough to stretch that much.
Click to expand...

I used it to tee the P mag -2 hose into the 1/4 hose from the cylinder to MAP sensor when adding the p mags. worked great. Just 0ne of a dozen ways to getter done. Good luck
 
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