Blower basics
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Blower basics

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    Boat 502 76Miller's Avatar
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    Default Blower basics

    Hey, just trying to learn a little bit about these "huffer" motors you guys run ! So my first question is if somebody is running a 468ci w/ a 671 blower 21% over what the hell does that mean as far as compression/power. Is this another term for "boost" ??? Is this thing hauling the mail or is this mild ? Edjimacate me

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    Senior Member vee-driven's Avatar
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    Quote Originally Posted by 76Miller View Post
    Hey, just trying to learn a little bit about these "huffer" motors you guys run ! So my first question is if somebody is running a 468ci w/ a 671 blower 21% over what the hell does that mean as far as compression/power. Is this another term for "boost" ??? Is this thing hauling the mail or is this mild ? Edjimacate me

    First off, a 468 with a 6-71 is kid sh!t, J/K. Boost is the amount of air forced in when vaccume no longer exists. 21% would be the % over 1to1.


    It's not that i don't care, I just dont give a sh!t!

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    Boat 502 76Miller's Avatar
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    Quote Originally Posted by vee-driven View Post
    First off, a 468 with a 6-71 is kid sh!t, J/K. Boost is the amount of air forced in when vaccume no longer exists. 21% would be the % over 1to1.
    Ok so when you turn up the boost that is going to make that ratio (21%) increase ? Also, adding more boost to a motor is just a pulley swap, right ?

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    Senior Member vee-driven's Avatar
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    You got it! I can run race gas on 15lbs or flip it to 6lbs and run pump.


    It's not that i don't care, I just dont give a sh!t!

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    Boat 502 76Miller's Avatar
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    Last questions on this subject.....is there some kind of formula/breakdown to figure how much boost a motor is running if its 21% w/ a 671 ? Also what do you think a little 468ci w/ this set up is making hp wise ????

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    Cantard 71hallett's Avatar
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    What,s a 6-71?
    As you add boost you also treat it like any power adder, things like timing exc.
    Quote Originally Posted by gn7 View Post
    It would be a balmy 85* in Steel's shop if he would move a little faster

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    Cantard 71hallett's Avatar
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    Quote Originally Posted by 76Miller View Post
    Last questions on this subject.....is there some kind of formula/breakdown to figure how much boost a motor is running if its 21% w/ a 671 ? Also what do you think a little 468ci w/ this set up is making hp wise ????
    Would need info like what heads you are using.
    Quote Originally Posted by gn7 View Post
    It would be a balmy 85* in Steel's shop if he would move a little faster

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    Senior Member vee-driven's Avatar
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    Run it with a boost gauge to see what the # is, all engines vary.


    It's not that i don't care, I just dont give a sh!t!

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    Quote Originally Posted by 76Miller View Post
    Last questions on this subject.....is there some kind of formula/breakdown to figure how much boost a motor is running if its 21% w/ a 671 ? Also what do you think a little 468ci w/ this set up is making hp wise ????

    I think BDS has a chart on their site with the #'s your looking for.


    Darrell.
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    28ft Sportcat
    With Twins

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    mo balls than $cents$ IMPATIENT 1's Avatar
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    surprised noone has mentioned how hot the intake charge would be at 21% on a unintercooled 6-71. i ran a weiand 6-71 on my 475bbc last summer and there was no noticeable difference between 12% and 21%imo. i was taking out so much timing to keep from detonating the hot intake charge, that imo , it wasn't worth over driving that much unless i had a badass chiller. you start needing to run 21%, than its time for a 8-71

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    Boat 502 76Miller's Avatar
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    I haven't even seen the motor I'm referring to yet. I'm going off what the guy said. I'm so used to talking about n/a motors that I was a little lost w/ the terminology. I motor has a intercooler on it though.

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    Boat 502 76Miller's Avatar
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    Quote Originally Posted by 71hallett View Post
    Would need info like what heads you are using.
    ported 990's, not sure about anything it has ( c/r, cam specs, etc)

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    Boat 502 76Miller's Avatar
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    Quote Originally Posted by DMOORE View Post
    I think BDS has a chart on their site with the #'s your looking for.


    Darrell.
    Cool, I'll check it out. Thanks

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    Boat 502 76Miller's Avatar
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    Quote Originally Posted by vee-driven View Post
    Run it with a boost gauge to see what the # is, all engines vary.
    Pat, where did you meet that chick in your avatar ? Sully's...dollar beers ? Thanks for the info.

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