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  1. #1

    Default OEM specs for ORIGINAL Chrysler Marine 440 Camshaft

    All,

    I'm looking for any documentation/knowledge on the camshaft profile for the original marine engines. The service manual has nothing.

    I'm in the process of "degree'g the cam" on both my engines (results to follow) as part of my rebuild/overhaul but I'm looking for a baseline to compare the results to.

    Any pointers to a "cam card" of the original OEM camshaft?

    Thx
    Steve

  2. #2
    Join Date
    Nov 2005
    Location
    Chi West, IL, USA
    Posts
    875

    Default Re: OEM specs for ORIGINAL Chrysler Marine 440 Camshaft

    I think I'd draft a form letter and send it to several cam grind companies to their tech support. I would think they have the specs if they grind replacements. Other than that one could indicate the cam on V-blocks with a degree wheel attached. The standard rocker is 1-1/2 the lift.
    I'd be curious if it comes close to any of these in the "Updated" area.......

    Mopar Engine Cam Chart (mopar1.us)

  3. #3

    Default Re: OEM specs for ORIGINAL Chrysler Marine 440 Camshaft

    Quote Originally Posted by daves69 View Post
    I think I'd draft a form letter and send it to several cam grind companies to their tech support. I would think they have the specs if they grind replacements. Other than that one could indicate the cam on V-blocks with a degree wheel attached. The standard rocker is 1-1/2 the lift.
    I'd be curious if it comes close to any of these in the "Updated" area.......
    So here's is what I measured on my cam. Full disclosure here; this is the first time I did this procedure (albeit after watching at least a dozen Youtube videos) so consider the data "suspect"... I took my measurements on #1 cylinder and also ran a quick set on the #4 cylinder as a reality check - and the results were quite close.

    As suggested above, next step is I'll check in w a few cam manufacturers to see what they can do for a replacement. Not sure I'll replace it but let's see how it runs after I finish the rebuild. I'm wondering if there is a more optimal cam for a sub-3000 RPM 42' 15 ton 10 knot boat? Better fuel economy would be nice but I'm not sure that is realistic. Anyway, FYI.

    - assume 70s era cam (engine is 1977) but unclear if it is stock Mopar or not
    - using hydraulic flat tappets
    - for standard rotation [starboard] engine

    #1 Cylinder Intake

    Max tappet lift 0.286
    Valve lift 0.429 (using 1.5 rocker ratio)
    Cam baseline run out 0.0 (no deviations off 0)

    Opens @ 0.006 15 deg BTDC
    Closes @ 0.006 73 deg ABDC
    Duration @ 0.006 268 deg

    Centerline Below Max 0.020 086 deg
    Centerline After Max 0.020 144 deg
    Centerline calculation 111 deg ATDC (crank)

    #1 Exhaust

    Max tappet lift 0.303
    Valve lift 0.455 (using 1.5 rocker ratio)
    cam baseline run out 0.0

    Opens @ 0.006 75 deg BBDC
    Closes @ 0.006 51 deg ATDC
    Duration @ 0.006 306 deg

    Centerline Below Max @ 0.020 216 deg (on the wheel ATDC)
    Centerline After Max @ 0.020 274 deg (ATDC)
    Centerline calculation 245 deg ATDC = 115 deg BTDC (crank)

    Lobe separation = 111 + 115 = 226 deg (crank) = 113 cam deg


    #4 Cylinder (for confirmation of above measurements on #1)
    Intake
    Max tappet lift 0.287
    Valve lift 0.431 (using 1.5 rocker ratio)
    Cam baseline run out 0.0

    Opens @ 0.006 15 deg BTDC
    Closes @ 0.006 75 deg ABDC

    #4 Exhaust
    Max tappet lift 0.301
    Valve lift 0.452 (using 1.5 rocker ratio)
    Cam baseline run out 0.0

    Opens @ 0.006 74 deg BBDC
    Closes @ 0.006 55 deg ATDC

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