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  #11  
Old 02-16-2021, 09:31 AM
TS Flightlines TS Flightlines is offline
 
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Dan---we've used -3 teflon for injector lines, mainly on SDS systems. These are on a IO390 with SDS and a baffle mounted fuel block. Similar idea for a flow divider.

Tom
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  #12  
Old 02-16-2021, 10:12 AM
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Ironflight Ironflight is offline
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Quote:
Originally Posted by TS Flightlines View Post
Dan---we've used -3 teflon for injector lines, mainly on SDS systems. These are on a IO390 with SDS and a baffle mounted fuel block. Similar idea for a flow divider.

Tom
I have ben looking at those on our neighbor’s project - man, are they slick...and beautiful!!
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  #13  
Old 02-16-2021, 10:34 AM
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Quote:
Originally Posted by TS Flightlines View Post
Dan---we've used -3 teflon for injector lines, mainly on SDS systems. These are on a IO390 with SDS and a baffle mounted fuel block. Similar idea for a flow divider.
Well 'ole buddy, it sounds like a product idea. However, I think we would want -2 lines to minimize the fuel quantity boiling out the open nozzle into the intake port after shutdown. Not a problem with the SDS application, as the injectors park with the pintle closed.
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  #14  
Old 02-16-2021, 03:25 PM
TS Flightlines TS Flightlines is offline
 
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-2 teflon is hard to find, and pricey. When we need a -2 hose, such as for primer or older oil pressure/fuel pressure installs, we convert our -3 straight hose ends to -2. Same -3 hose, same stems, we turn the bodies and the flareheads down on the lathe so the -2 nuts will clear. The 471-2D stem ID is .060, our -3 stem after crimp is .079.
Works well.

Tom
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Joint Venture with Aircraft Specialty
Teflon Hose Assemblies for Experimentals
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RV7 Tail Kit Completed, Fuse started-Pay as I go Plan
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  #15  
Old 02-16-2021, 04:55 PM
scsmith scsmith is online now
 
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Quote:
Originally Posted by TS Flightlines View Post
-2 teflon is hard to find, and pricey. When we need a -2 hose, such as for primer or older oil pressure/fuel pressure installs, we convert our -3 straight hose ends to -2. Same -3 hose, same stems, we turn the bodies and the flareheads down on the lathe so the -2 nuts will clear. The 471-2D stem ID is .060, our -3 stem after crimp is .079.
Works well.

Tom
DanH's idea is to reduce the internal volume as much as possible. Just changing the ends doesn't do it. Even if the -2 line is pricey, a bunch of us might happily pay it to avoid this cloud hanging over.

I look mine over every time the cowl is off. I have seen one break on a Maule.
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  #16  
Old 02-16-2021, 05:47 PM
blaplante blaplante is offline
 
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Default time between replacement?

Assuming the failure at 1470 hours was with well secured lines... perhaps replacing the injector lines every 1000 hours would be advised?
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  #17  
Old 02-16-2021, 08:03 PM
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Plummit Plummit is online now
 
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I look mine over every time the cowl is off. I have seen one break on a Maule.
If you have a plenum, looking the injector lines over doesn't happen very easy.

-Marc
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  #18  
Old 02-16-2021, 10:10 PM
TS Flightlines TS Flightlines is offline
 
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Steve--I think Earls might be the only other source for -2 hose ends, and they are reusable. $50.00 EACH for 1 straight. 45* is like $75.00, and 90* is $87.00. Each. These are block style, heavy.
That takes care of the flow divider side, where you can substitute a AN816 nipple (usually AN816-2 is aluminum). Doesnt fix the injector side.
On another note, I do have some prototype -2 ball seat primer/flow divider fittings in straight and 90* that I messed with several years ago. Big issue is the nut, and making the stem small enough for the nut to pass over, without changing the nut alot.

Can be done though

Tom
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Joint Venture with Aircraft Specialty
Teflon Hose Assemblies for Experimentals
Proud Vendor for RV1, Donator to VAF
RV7 Tail Kit Completed, Fuse started-Pay as I go Plan
Ridgeland, SC
www.tsflightlines.com, www.asflightlines.com
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  #19  
Old 02-16-2021, 11:07 PM
Stewbronco Stewbronco is offline
 
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Default Happily pay !

Heh Tom ...I wholeheartedly agree with Steve ...would happily pay for -2 lines fir this application!
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  #20  
Old 02-19-2021, 07:50 AM
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Tandem46 Tandem46 is offline
 
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Quote:
Originally Posted by TS Flightlines View Post

Can be done though
Tom, any more word or progress on this? How realistic or difficult would it be for you to produce braided lines for direct replacement of the stainless FI lines?
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