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Hi All,

The air nipple on the turbo side of my 914 airbox broke off during cleaning. I removed the remaining piece which was secured by a locknut. The part of this nipple protruding into the airbox has a hole drilled on one side about 20mm from the screw threads. The end of the protruding piece is not drilled. Is there a specified orientation for this air hole in the part of the nipple protruding into the airbox? Should the hole be upwind or downwind of the airflow in the airbox?

Many thanks for any info shared. Could not find any info in the 914 manuals.

John

  • Re: air Nipple orientation on 914 airbox

    by » one month ago


    😍 it will be more easy to answer if you can show the picture please.


  • Re: air Nipple orientation on 914 airbox

    by » one month ago


    Hi Xing Wang,

    Will post pictures of airbox and damaged nipple tomorrow.

    Many thanks, John


  • Re: air Nipple orientation on 914 airbox

    by » one month ago


    Please see photos of nipple 940555 and airbox. Which way should the hole at the airbox internal end be facing?

    Many thanks for any info.

     

    27278_2_Rotax pn 940555 31082020.jpg (You do not have access to download this file.)
    27278_2_Rotax 914 airbox 31082020.jpg (You do not have access to download this file.)

  • Re: air Nipple orientation on 914 airbox

    by » one month ago


    Yes, this is high pressure line , when throttle goes to 115% the turbo make pressure,  that high pressure this this specific nipples transfer through enricher to carburetor for supply of maximum fuel/gas.if you doesn't connect this nipples to Enricher , the supply of fuel at 115 WOT can be disturb and you can't go on 5800 Rpm.

    Nipples working on pressure base.just installed new part  downward 👇 and fully tight with loctite .

     

    27282_2_Screenshot_2020-08-31-23-49-43-211_com.android.chrome.png (You do not have access to download this file.)

  • Re: air Nipple orientation on 914 airbox

    by » one month ago


    I looked through the heavy maintenance manual and could not find where this is addressed. It seems like a good question. The hole in the nipple is clearly a specially shaped hole. But maybe the thing about the special shape is that it makes it so that it doesn't matter what direction if faces? Is there any mark on the outer portion of the nipple that coincides with the orientation of the hole? We need a 914 expert to jump in here.

     


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