Duration @.50

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    Author Topic: Duration @.50  (Read 1099 times)

    nivvy

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    Duration @.50
    « on: December 09, 2007 - 10:30:48 AM »
    I know the duration @.50 is more accurate than advertised duration but what is the duration @ lash .020 for.... :working:

    LIFT   LIFT            LIFT         LIFT                DURATION            DURATION     DURATION   
     1.7     1.6          1.5             @ Cam          @ Lash .020”      @ .050”          @.200”   
    .681   .674”        .632”            .421”            287                  252           173
     
    wanted use the .904 lifter advantage with the engle cam....I was always told to go by .50 and 252 seems very streetable with the high lift...   
    « Last Edit: December 09, 2007 - 10:43:15 AM by StRoKer »
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    Offline Chryco Psycho

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    Re: Duration @.50
    « Reply #1 on: December 09, 2007 - 11:47:50 AM »
    Yes , it should be reasonable , the overlap where both valves are open at the same time will affect it as well
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    Challenger - You`ll wish You Hadn`t

    nivvy

    • Guest
    Re: Duration @.50
    « Reply #2 on: December 09, 2007 - 11:59:59 AM »
    Engle does state when ordering the cam to choose the overlap you want......
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    Offline matt63

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    Re: Duration @.50
    « Reply #3 on: December 10, 2007 - 04:48:33 PM »
    The duration @ 0.050" number is meant as a way of more accurately comparing one grind to another rather than using the advertised duration.  I think that the duration before 0.050" doesn't matter anyway (valves aren't open enough)
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    Matt in Edmonton

    '68 Valiant
    '73 Cuda 340 4 speed (408) SOLD

    Offline moper

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    Re: Duration @.50
    « Reply #4 on: December 11, 2007 - 12:29:49 PM »
    You need to know what the lobe looks like. The more data points on that slope the better the picture you can develop. You've been told to compare at .050 lift rather than total duration, but carrying that idea to the next couple levels, the duration at lash is what it will really be once installed (and you can see that's 30° more over the next .030 lift..).
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