Page 2 of 2 FirstFirst 12
Results 11 to 15 of 15

Thread: Compression Tester Orifice

  1. #11

    Join Date
    Mar 2021
    Posts
    7
    X
    Last edited by cardo0; 04-19-2021 at 01:19 AM. Reason: Original post nonsense.

  2. #12
    Eric Page's Avatar
    Join Date
    Jul 2011
    Location
    Toledo, WA
    Posts
    315
    Quote Originally Posted by cardo0 View Post
    ...crank up the supply pressure to 80psi or 85psi or whatever you use.
    Just a note that Rotax specifies using a pressure of 6 bar for testing, which equates to 87 psi. This is often missed by mechanics/operators who are used to the Lycoming and Continental world where 80 psi is the norm.
    Eric Page
    Building: Kitfox 5 Safari | Rotax 912iS | Dynon HDX
    Member: EAA Lifetime, AOPA, ALPA
    ATP: AMEL | Comm: ASEL, Glider | ATCS: CTO
    Map of Landings

  3. #13

    Join Date
    Mar 2021
    Posts
    7
    X
    Last edited by cardo0; 04-19-2021 at 01:19 AM. Reason: Original post nonsense.

  4. #14

    Join Date
    Mar 2021
    Posts
    7

    Happy

    X
    Last edited by cardo0; 04-19-2021 at 01:20 AM. Reason: Original post nonsense.

  5. #15

    Join Date
    Nov 2011
    Location
    Hood River, OR
    Posts
    31
    Gentlemen, please accept my apologies for my lack of clarity. There are orifices and there are orifices. There is the orifice that is in the flow when the compression test is being performed. The size of this orifice is either .040" or .060" depending on bore size. These sizes were determined shortly after WW2 and not the subject of my question. Although how these sizes were determined would be interesting to know. My question concerned the orifice that Continental calls a "Master Orifice". Continental calls the first or in use orifice a "restrictor orifice". The little that I can find says the master orifice size also is .040",but I am not sure what orifice they are talking about. Incidentally as I understand it the use of master orifice to determine "allowable" leakage is only applicable to Continental engines. In any event, the question is, how was the size determined.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •