Vortecpro 781 head dyno test
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Vortecpro 781 head dyno test

  1. #1
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    Default Vortecpro 781 head dyno test

    496 4.315x4.250, 10.4 compression, 240s @ .050 663 lift gross, 110 lobe separation, solid roller cam, ported 781 GM oval port heads, 2.190/1.880 valves, ported performer RPM air gap intake, 1000 cfm HP holley, 1 inch open carb spacer. 2 inch headers, 3 inch junk magnaflow mufflers.
    Last edited by Vortecpro; 08-04-2010 at 06:30 PM.
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    just a ski boat with bark Carnivalride's Avatar
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    Well what size valves, what lift, what LS on the cam, what exhaust and what about the results?
    Quote Originally Posted by gn7 View Post
    Carnivalride, you really need to find some other hobby. You have no talent for this boat thing
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    cfm
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    680hp
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    cfm
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    BTW: Where is Warpspeed with his famous saying when you need him ?

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    SPAM!
    Last edited by cfm; 08-04-2010 at 03:17 PM.
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    gn7
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    Quote Originally Posted by cfm View Post
    BTW: Where is Warpspeed with his famous saying when you need him ?




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    Last edited by gn7; 08-04-2010 at 04:52 PM.
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    Is this going to be another "touchy-feely" moment or will there be some logical discussion of where numbers come from.

    Or will some opinions have the relevance of a network of Foley B catheters in comparison to IC piston engines?

    Regards,
    IG
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    Well CFM your right about one thing, this 496 did make 680 HP @ 5500 RPM. This build is dedicated to you CFM.
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  10. #8
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    Default Dyno Sheets 496 Iron Head BBC

    To all that might be interested in some dyno numbers,

    I will have to do these slowly as my server (and I) are speed challenged.

    First up is the pic of the engine. Kindly note the oddball pan which is for fitment into an early Chev. Would have been nice to use the same pan as the controversial AFR oval port aluminum headed 496 OR one of the great big marine pans. Sometime maybe some data on pans will pop up on this On the Dyno section.

    Regards,
    IG
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    Trying again.....

    Pretty big files initially. Sorry.

    Regards,
    IG
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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    Default Dyno Sheets 496 Iron Head BBC

    Attached pics of dyno sheets (3 total).

    As before, let the comments and questions begin relative to the dyno data.

    This engine is a 496ci oval port iron head BBC.

    Regards,
    IG
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    gn7
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    Interesting. Right about the time the HP starts to go south, the A & B fuel flow gets pretty wide spread.



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    Evidently there were some fuel and carburetor issues.

    There was not time for him to tweak things to a much better level.

    As it has been mentioned the power starts to "go south" a bit initially but note the overall fuel curve. Not as smooth as could be done with some time spent tweaking and tuning. Might have left about 6 to 10 or more CBHp on the chopping table across the curve. So much to do and so little time.

    Funny thing about weather fronts and fuel quality and characteristics could also be discussed. Neither is any fun.

    Regards,
    IG
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    Quote Originally Posted by Inquisitive Gearhead View Post
    Would have been nice to use the same pan as the controversial AFR oval port aluminum headed 496 OR one of the great big marine pans. Sometime maybe some data on pans will pop up on this On the Dyno section.

    Regards,
    IG
    I posted this up a while back to some what settle the disbute as to whether oil pans were worth any real HP. It may be some bias in that it was conducted at Moroso. But all the products are Moroso, and they weren't to shy to show the difference between their econo stuff,and the Pro stuff.

    Quote Originally Posted by Inquisitive Gearhead View Post
    Evidently there were some fuel and carburetor issues.

    There was not time for him to tweak things to a much better level.

    As it has been mentioned the power starts to "go south" a bit initially but note the overall fuel curve. Not as smooth as could be done with some time spent tweaking and tuning. Might have left about 6 to 10 or more CBHp on the chopping table across the curve. So much to do and so little time.

    Funny thing about weather fronts and fuel quality and characteristics could also be discussed. Neither is any fun.

    Regards,
    IG
    Actually, I was just wondering if one is the possible cause for the other.



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  16. #14
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    Quote Originally Posted by Inquisitive Gearhead View Post
    Evidently there were some fuel and carburetor issues.

    There was not time for him to tweak things to a much better level.

    As it has been mentioned the power starts to "go south" a bit initially but note the overall fuel curve. Not as smooth as could be done with some time spent tweaking and tuning. Might have left about 6 to 10 or more CBHp on the chopping table across the curve. So much to do and so little time.

    Funny thing about weather fronts and fuel quality and characteristics could also be discussed. Neither is any fun.
    Regards,
    IG
    No, but they're all part of life, and part of the game.
    Why schedule dyno time if you don't have enough time to "tweak and tune"? Isn't that the idea?
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