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Venting of Lycoming 0-290 D Engine
Hello
I have been helping a young fellow EAA member with the restoration of a EAA Biplane , he is using a rebuilt Lycoming 4cyl. , 125 H.P. 0-290 D engine in this plane and has a 3/8 " O.D. aluminum tube running from the firewall and exiting just ahead of the tailwheel , he wants' to keep the underside of this fabric covered plane as clean as possible , the vent elbow that exits the top forward area of the crankcase has an I.D. of approx. 5/8 " , he plans to put a reducer to make the step from 5/8 " I.D. to approx 1/4 " I.D. on the alum tube , this tube will go from the firewall to the tailwheel , the question is this , does the engine vent just relieve pressure and will the long narrow tube cause any problem ?, am not an expert in the dynamics of this of this area of the engine , any thoughts or help would be appreciated . Thanks Phil Lohiser EAA 12873 |
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