Lyc Breather Tube

[dwschaefer]

Can someone please shoot me some pictures or a link to their web-site of how your terminated your oil breather tube? I built mine like my Grumman Tiger with a 'whistle' shaped cutout in the aluminum inside the cowl so that warm air could keep the discharged oil from freezing on cold days. I'm not satisfied with this solution any longer and wanted to see what others are doing.

Regards,

DWS

 

[smokyray]

Breathe Deeply...

Can someone please shoot me some pictures or a link to their web-site of how your terminated your oil breather tube? I built mine like my Grumman Tiger with a 'whistle' shaped cutout in the aluminum inside the cowl so that warm air could keep the discharged oil from freezing on cold days. I'm not satisfied with this solution any longer and wanted to see what others are doing.

Regards,

DWS

DWS,

Having spent many hours perfecting the perfect cowl air exit, drag reduction and breather tube location on 2 RV's and my HR2 here is what I found. First and foremost, if the hose exits inside the cowling it won't function correctly (as you found) as it's high pressure inside the cowl vs lower pressure from the crankcase. You want it to slightly "draw" the air out of the breather.

I route the rubber hose from the engine breather up to a Slimefighter http://www.aircraftspruce.com/catalog/eppages/slimeftr.php or M20 air-oil separator. Since I do alot of acro, this helps belly cleanliness.
Post separator, the exit hose goes down alongside and engine mount and out the center of the lower cowl opening between exhaust pipes. I use a short piece of aluminum tubing with a 45 degree slice attached to the end of the hose. Then hose clamp and adell clamp it to structure with the slice facing aft in the slip stream. http://www.google.com/search?q=slim..._O-X02QWc44DICw&ved=0CDQQsAQ&biw=1181&bih=596

I have had great success with this setup. I'll try to get you a photo when I can...

V/R
Smokey
Dues gladly paid in Iraq...
Gladly paid to DR anyway...

 

[RV8R999]

Smokey,

Does this separator drain the oil back to the case from the input line? I see only two connections.

Thanks,

Spank