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  #1  
Old 05-02-2012, 02:14 PM
Dan Langhout's Avatar
Dan Langhout Dan Langhout is offline
 
Join Date: Mar 2008
Location: Huntsville, AL USA
Posts: 546
Default Tip: Crankcase Vent Tube Elbow

There's been lots of discussion on the forums about the rubber elbow that Van's supplies to connect the crankcase vent fitting on the engine to the aluminum tube that runs down the firewall. Basically, this elbow is a NAPA 9816 formed 90 degree heater bypass hose for some car or truck. The problem is that since it is a coolant hose, it doesn't stand up well to oil vapor in our application and turns gummy after a while. Proper MIL spec hose is available - but not in a formed 90 degree elbow which is what you need to hook up to the aluminum tube from Van's. What's really needed is a 3/4" diameter formed 90 degree Positive Crankcase Ventilation (PCV) hose.

After digging around quite a bit, with no luck, I finally ran across this:



Now this hose is more than it seems. There are plenty of places to buy blue silicone coolant hose which looks much like this. They have the same problem as the other coolant hoses - they won't stand up to petroleum products. This hose has a fluorocarbon liner and is specifically rated to be used in systems where oil vapor is in circulation - exactly our application.



Here's a shot of the trimmed down hose installed on my engine. (For the sharp eyed among you - the oil cooler lines in the background of this photo are not real lines - they are mockups for the actual oil cooler hoses which should be coming from SAC today.)



The formed vent hose is available from Autosiliconehoses.com which is in the UK. The specific part is SFL 090 019 (19mm hose, 90 degree with Fluorocarbon liner).

They may be available from other sources, but this is where I bought mine. They aren't cheap and with VAT and shipping from the UK it makes it even higher (I bought two and the total was $62.93 - of which almost half was shipping and tax.) However, I don't expect to have to change this thing anytime soon (if ever).

FWIW.
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2020 =VAF= Dues PAID . . . . .
RV-7 N528DP slow build
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665 hours and counting . . . .
Now based at Moontown (3M5)

Last edited by Dan Langhout : 05-02-2012 at 02:17 PM.
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  #2  
Old 05-02-2012, 03:18 PM
roee roee is offline
 
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Location: San Diego, CA, U.S.A.
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Default Another solution

A while back I actually looked at using that same hose you found. Seems like it could work well. But I came up with a different solution to the same problem. My solution, in short, was to replace the straight nipple fitting on the engine with a 45 degree nipple fitting. Then use a straight section of MIL6000D hose, no hose elbow needed, to connect to the aluminum tube trimmed a little further away. Makes a neat and secure installation, and uses all appropriately rated standard aircraft materials, which in this case are also actually less expensive and more readily available than that exotic automotive hose elbow.

More details here: http://www.kalinskyconsulting.com/rv...sebreather.htm





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  #3  
Old 05-03-2012, 07:05 AM
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rzbill rzbill is offline
 
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Default

My YIO-360-M1B from Lycoming came with the fitting already installed that Roee shows.
I did the same solution. Short MIL6000D.
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  #4  
Old 05-03-2012, 08:15 AM
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AlexPeterson AlexPeterson is offline
 
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Location: Maple Grove, MN
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Default

Dan, good find. While the 45 degree fitting might be the best solution, it certainly isn't for an engine already hung! I ended up soldering a couple of copper fittings together to make a 180 degree turnaround, since my breather needed to go down to the right side of the firewall.
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  #5  
Old 05-03-2012, 08:54 AM
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Vlad Vlad is offline
 
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Default

I like that blue hose Dan. I am thinking of getting one in time for condition inspection. Mine is stock, a bit oversized and doesn't look pretty.
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  #6  
Old 05-03-2012, 09:11 AM
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Dan Langhout Dan Langhout is offline
 
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Default Style

Quote:
Originally Posted by Vlad View Post
I like that blue hose Dan. I am thinking of getting one in time for condition inspection. Mine is stock, a bit oversized and doesn't look pretty.

The real reason I got this hose is because it matches my shoes.
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2020 =VAF= Dues PAID . . . . .
RV-7 N528DP slow build
First Flight July 26th, 2014
665 hours and counting . . . .
Now based at Moontown (3M5)
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  #7  
Old 05-03-2012, 09:39 AM
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Vlad Vlad is offline
 
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Quote:
Originally Posted by Dan Langhout View Post
The real reason I got this hose is because it matches my shoes.

and it's British
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Не имей сто рублей, а имей сто друзей.
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  #8  
Old 05-03-2012, 10:11 AM
Lux Wrangler Lux Wrangler is offline
 
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Default you can do anything, but...

Quote:
The real reason I got this hose is because it matches my shoes - Dan
Does the hose come in suede too?
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  #9  
Old 05-03-2012, 01:53 PM
n700jl n700jl is offline
 
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Location: McCordsville IN
Posts: 277
Default safety ALERT!!!

Dan, is that a hose clamp holding on your oil line? If so please change this before flying this aircraft! Please contact me if you have any questions!!! Thank you!
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RV-6 Flying IO-320X tip up 500+hrs G3X 2004 Oshkosh Outstanding workmanship award, 2004 Sun N Fun Best Workmanship 2006 Sun N Fun Outstanding Aircraft
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  #10  
Old 05-03-2012, 02:39 PM
HSANTIBANEZ HSANTIBANEZ is offline
 
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Location: Chile, Valparaiso
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Default

Please can you tell us what is the problem with that adel clamps.
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