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Thread: Elgin Cams: Modified S Cam for '73 2.4L?

  1. #1

    Elgin Cams: Modified S Cam for '73 2.4L?

    Can anyone share their experiences with the Elgin modified S cam installed on a 2.4S engine? I'm interested in the before/after value for the money. My understanding is that it broadens the power curve by about 2000RPM and ups the top end ~10-15HP. I'm mostly looking for better relaxed driveability out of my S (the extra top end couldn't hurt either). Note: its my daily driver, not a dedicated track car (some AX & rally's).

    Any general experiences about Elgin cams in general also welcome.
    Chris Purpura @civilizedmisfit
    ___________
    Member #479
    72T aka The "Civilized Misfit" Build - Helicopter Cooled! See: https://www.excellence-mag.com/issue...vilized-misfit
    2019 911 Carrera GTS (sold, no regrets)
    73S - #1100 (restored and now somewhere in Europe &#128546
    1997 993 Carrera 4S Black on Black (sold &#129394

  2. #2
    What are valve lift and duration numbers?

  3. #3
    Garth,

    Uhmm, let me try to get this right (I'm not a mechanic).

    The spec sheet has two lines, one for Intake and one for Exhaust

    Valve Lift
    Intake - 0.474
    Exh - 0.438

    Lift @ overlap is 4.5MM

    Is that what you needed?
    Chris Purpura @civilizedmisfit
    ___________
    Member #479
    72T aka The "Civilized Misfit" Build - Helicopter Cooled! See: https://www.excellence-mag.com/issue...vilized-misfit
    2019 911 Carrera GTS (sold, no regrets)
    73S - #1100 (restored and now somewhere in Europe &#128546
    1997 993 Carrera 4S Black on Black (sold &#129394

  4. #4
    Duration is given in degrees.

    S cams are as follows:

    intake lift .459 duration 267 deg.

    exhaust lift .396 duration 235 deg.


    The lift numbers you posted are the same as for a GE 40 cam which has more lift than an S cam but with less duration. Maybe the modified S cam is a S spec cam in duration with GE 40 lift that would allow more flow but still match the S MFI pump.
    Bobby
    71' Olive 2.2E Targa / Early S #491

    I've always considered the glass to be half full...that is until I reached middle age and realized that it is actually half empty.

  5. #5
    Just got this off Pelicans' board.

    Elgin Modified S-Cam (Intake 296 @.470 lift and Exhaust 270 @.395 lift) with 102 lobe centers and 4.5mm lift at lap)
    Bobby
    71' Olive 2.2E Targa / Early S #491

    I've always considered the glass to be half full...that is until I reached middle age and realized that it is actually half empty.

  6. #6
    cam companies are changing at what lift duration is measured. be sure to compare apples to apples.
    72 911t * 74 914 2.0

  7. #7
    Senior Member
    Join Date
    Oct 2002
    Location
    Dallas, TX
    Posts
    372
    Resurrecting this thread, since I am in the same boat ( see, I did some research )

    My cams have a little pitting so they are on their way to Elgin to be repaired. Does any opinions on this mod 10 years later? I have a stock 2.4S that is being rebuilt at a glacial pace.

    Thanks,
    Neil
    Neil
    '73 911S targa

  8. #8
    Senior Member
    Join Date
    Nov 2002
    Location
    Fremont, CA
    Posts
    1,219
    I'd keep the S cams: originality, the real 'S' character, and will make your life infinitely easier with the MFI...
    scott kinder
    kindersport@gmail.com

    Registry #614

    9110220587 - 1973 RSR revival in progress
    My Car Thread: "Five-Eighty-Seven..."
    “If it isn't there, it didn't cost anything, it doesn't weigh anything and can't break." - From the philosophy of Grady Clay

  9. #9
    Senior Member
    Join Date
    Aug 2005
    Location
    VA
    Posts
    338
    Any modification to the cams will require the installation of an Innovate, Air Fuel Ratio Meter to get the MFI just right. I went with the Dougherty DC 30 cams on my 2.4 E. Basically an E cam with the associated torque but more lift so it breaths better at the top end. Could not be happier.

    Chris

    73 911 E

  10. #10
    I have the Elgin modified S in a 2.7 with PMO's, so can't address the mfi issue. THe modified S is a great cam for weekend track use, with a wider power band than the normal S. Elgin makes a quality product. But I would think it a poor choice for a street machine unless you like to spend a lot of time in the 5-7000 rpm band; the E-variants produce a lot more oomoph at 2500-4000 rpm where you are most of the time when driving around town.
    jhtaylor
    santa barbara
    74 911 coupe. 2.7 redone by Competition Engineering; ported to 36mm, shuffle-pinned, boat-tailed, Elgin mod-S cams, J&E 9.5's, PMO's.
    73 Targa (much beloved, sold and off to a fine new home in San Francisco)

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