Blower motor timing, locked out or curve?
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Blower motor timing, locked out or curve?

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    Senior Member Smallblocksperry's Avatar
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    Default Blower motor timing, locked out or curve?

    2003 26' american offshore

    just built a 540ci
    dart big m block
    dished JE 8.25-1 pistons
    merlin 345 iron heads, ported/polished
    billet solid roller .252/.262 @.050 .652" lift 114 blower cam
    comp rockers/stud girdles
    imco powerflow exhaust
    littlefield 8-71 blower/intercooler
    dual 750 holley carbs mechanical and electrical fuel pumps
    8% overdriven right now, wont know boost numbers until i get it running, what kind of boost will i be safe at with pump gas?
    with pump gas, what kind of timing curve should i put in it, with what final timing? or lock it out?
    how about carb jetting, does anyone have any experience with a similar setup? powervalves?

    any info much appreciated

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    Senior Member SHAWN DAVIS's Avatar
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    Iron heads, better be conservative on that total timing.
    Myself, I always lock them out, anywhere from 28-34 depending on compression, boost, blower type.
    I would think 30 total would be a close starting point. Shoot for around 10 lbs of boost
    On carbs I dont really like power valves, I block them and up the mains 4, then add another 8-10% again to the mains

    these are my opinions only from ones similar I've built and worked decent

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    The member 1bdhondo's Avatar
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    Lock it out .... You dummy

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  6. #4
    gn7
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    Quote Originally Posted by 1bdhondo View Post
    Lock it out .... You dummy
    DUMMY? I take it he he is your brother



    That isn't some 1500lb flat bottom. Not everything pops out of the water at 2500 Rs
    I think I would start with a curve. It cost ZERO to change it.

    Just my opinion, but your already overdriven too much. If thats a typical Littlefield blower, I back it down to around 1 to 1 to start. I doubt you'll ever get it passed 5% over on pump.



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    Last edited by gn7; 08-14-2012 at 09:21 AM.

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    Senior Member SHAWN DAVIS's Avatar
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    Didnt even see the american offshore line, I built an almost identical 509 bbc 8/71 blown bbc, with some brodix heads, intercooled, that went in a 26 American Offshore NSX. 748 hp and 104 mph

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    Senior Member Smallblocksperry's Avatar
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    Quote Originally Posted by SHAWN DAVIS View Post
    Didnt even see the american offshore line, I built an almost identical 509 bbc 8/71 blown bbc, with some brodix heads, intercooled, that went in a 26 American Offshore NSX. 748 hp and 104 mph


    What size prop, gear ratio, drive?

    748 sounds like a pretty conservative tune up, I was shooting for 900

    Either way 104 sounds good enough for me

    Did u run it locked out or a curve ?

  9. #7
    Senior Member SHAWN DAVIS's Avatar
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    If memory serves me right, bravo 1 1.36 28 pitch 4 blade 6000 rpms, pretty conserative yes,had 950 hp carbs. 900 hp will be tough w those heads, blower and carbs. locked out at 30 degrees, think that was w a regular hydraulic cam. Switched to a solid roller after a year or so but didnt put it back on the pump to check it.
    Owner couldnt work on it himself so I built it around his skill level-(oil changes only)

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