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Thread: M-61 Linkert

  1. M-61 Linkert

    Has anyone tried an M-61 on a ULH?

  2. #2
    Join Date
    Mar 2008
    Location
    Beautiful Northern NM
    Posts
    12,287

    Re: M-61 Linkert

    Unless you are planning to install the larger venturi it is the same bore size as an M51L, the standard carb for a ULH. Why are you wanting to try it?
    Friends help friends move,
    Real friends help friends move bodies!

  3. #3

    Re: M-61 Linkert

    I have removed this comment because of the helpful remarks offered by others.
    Last edited by panic; 11-19-2019 at 09:21 AM.

  4. #4

    Re: M-61 Linkert

    I am running an M-75 on one of my ULH stroker engines and it runs great. I am running a KHK manifold w/the larger intake port modification. This manifold looks to be the early, shorter version for the BTSV. https://www.ebay.com/itm/Custom-4-Bo...53.m1438.l2649 Seadub

  5. #5

    Re: M-61 Linkert

    That's something that's been missing from the market for decades, but the price!

  6. Re: M-61 Linkert

    We happen to have an M-61. Venturi is 1 1/8", same as M-51 L. Manifold adapter is not a problem. My concern is that the M-61 has a fixed jet and a high speed trimmer needle. I don't know what jet size would be appropriate.

    The M-75 has no fixed jet and is therefore easier to tune.

  7. #7
    Join Date
    Sep 2009
    Location
    Missouri City, Texas
    Posts
    10,894

    Re: M-61 Linkert

    Panic recently posted this formula for fixed jets...

    "The original threaded hole in the casting (for both main jet and body plug) is 8-32 NC.
    An old rule of thumb for Linkert Model M main jet size for the 4-bolt carburetors was the square root of engine displacement in inches ÷ 11,000: (D ÷ 11,000)^.5.
    Some results:
    Size, calculated jet ID (OEM carburetor, factory jet)
    45, .064" (M-53 .0649")**
    54, .070" (M-53A1 .070")
    61, .0745" (M-61 .0795")*
    74, .082" (M-74B .082")

    * I suspect the relatively large manifold plenum, large ports & valves, and very high rod ratio (2.13:1) indicate a 14% larger jet to compensate for weak vacuum draw.
    ** the above rule is not followed here because of the strong draw of the booster venturi, a 45 with an M-53A (1-5/16" straight venturi) would use a .068" jet."

  8. #8

    Re: M-61 Linkert

    I have removed this comment because of the helpful remarks offered by others.
    Last edited by panic; 11-19-2019 at 09:22 AM.

  9. Re: M-61 Linkert

    Thanks for the helpful responses.

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