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Thread: Blown 383 stroker cam selection
          
   
   

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  1. #1
    erik erikson's Avatar
    erik erikson is offline CHR Member Visit my Photo Gallery
    Join Date
    Aug 2004
    Location
    clive
    Car Year, Make, Model: BLOWN 540 57 CHEVY
    Posts
    2,878

    Quote Originally Posted by techinspector1
    Probable results of that cam in your motor.....
    Your engine summary is as follows:
    Bore - 4.03 inches
    Stroke - 3.75 inches
    Rod c-c length - 5.7 inches
    With a static compression ratio of 8.0:1.
    Your camshaft specifications call for an inlet valve closing of 85 degrees ABDC (after bottom dead center).
    Your chamber volume is 111.98 cc's. With this camshaft your dynamic, or effective stroke is 2.35 inches.
    Your dynamic compression ratio is 5.38 :1 corrected for cam timing, altitude, and rod length.
    Your dynamic cranking pressure, corrected for cam timing, rod length and altitude is 93.72 PSI.
    Your dynamic boost compression ratio, reflecting static c.r., cam timing, altitude, and boost of 8 PSI is 8.31 :1
    Richard,111.98 cc chamber volume?
    How did you arrive at this number?

  2. #2
    techinspector1's Avatar
    techinspector1 is offline CHR Member Visit my Photo Gallery
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    May 2003
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    Zephyrhills, Florida, USA
    Car Year, Make, Model: '32 Henway
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    Quote Originally Posted by erik erikson
    Richard,111.98 cc chamber volume?
    How did you arrive at this number?
    I didn't, the calculator spit it out as a result of using the bore and stroke and static compression ratio to find the total compressed volume.

    I'd like to hear your take on nitro's cam recommendation. I'm just going by the calculator and using 8 to 8 1/2 dcr. Should the dcr be different on a blown application as opposed to naturally aspirated????

    Here are the results using a 64* ABDC closing point:
    Your engine summary is as follows:
    Bore - 4.03 inches
    Stroke - 3.75 inches
    Rod c-c length - 5.7 inches
    With a static compression ratio of 8.0:1.
    Your camshaft specifications call for an inlet valve closing of 64 degrees ABDC (after bottom dead center).
    Your chamber volume is 111.98 cc's. With this camshaft your dynamic, or effective stroke is 2.95 inches.
    Your dynamic compression ratio is 6.50 :1 corrected for cam timing, altitude, and rod length.
    Your dynamic cranking pressure, corrected for cam timing, rod length and altitude is 121.02 PSI.
    Your dynamic boost compression ratio, reflecting static c.r., cam timing, altitude, and boost of 8 PSI is 10.04 :1.
    Last edited by techinspector1; 06-01-2007 at 04:21 PM.
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