Victorjr vs. Rpm airgap
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Victorjr vs. Rpm airgap

  1. #1
    The Good mrjoshua's Avatar
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    Default Victorjr vs. Rpm airgap

    what do you guys recommend for a 460 BBC build up w/holley850 dp/ mech secondaries. performance ski/cruiser w/ this cam? VICTOR JR OR RPM AIRGAP?
    RPMS 5500-6000MAX?

    Competition Cams K11-456-8 Xtreme Marine Camshaft Kit Opt.Retro-Fit Hyd Roller2800-6200rpmAdv.Dur. 296 Int./302 Exh.V.Lift .566 Int./Exh.Lobe 112 deg.Incl.
    Last edited by mrjoshua; 10-10-2010 at 06:55 PM.

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    Resident Ford Nut Sleeper CP's Avatar
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    Here we go again........................ This seems to be a favorite topic.


    I'm a fan the the Air-Gap but over time my "boating family" has shown so light on this subject..... An Air Gap will would, but if you plan on running that thing over 5,000 the Victor Jr. will be a better choice.

    In a "cruiser" family ski boat that will live from 2,700 to 5,000 99% of the time I think the Air Gap will out perform the Victor Jr. for the most part. If you're going to run it and what to rev it to 6,000 from time to time the Victor Jr. is probably you better choice.



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    just remember...the Air Gap is a dual plane & the Victor Jr is a single plane! ...if the carb is jetted rite, i think the Air Gap is a better choice for pulling skiers etc ...just sayin' my .02 cents

    FastRat

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    The Good mrjoshua's Avatar
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    I don't want to be having to be screw with the carb set up all the time. we're at altitude here so i don't think i'll have as much forgiveness. starting up and running well pulling skiers and hammering it to get them out is most important. if i lose a little in the top so be it. it will still be faster than my old stock 455 w/ q jet.
    Last edited by mrjoshua; 10-10-2010 at 06:56 PM.

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    Super Moderator HammerDown's Avatar
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    Question > if a engine is hitting the wall at 5400 > would the Victor Jr alone give you more RPM?
    <img src=http://www.performanceboats.com/gallery/data/500/medium/06-30-11_1234.jpg border=0 alt= />

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    Senior Member H20MOFO's Avatar
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    Quote Originally Posted by mrjoshua View Post
    I don't want to be having to be screw with the carb set up all the time. we're at altitude here so i don't think i'll have as much forgiveness. starting up and running well pulling skiers and hammering it to get them out is most important. if i lose a little in the top so be it. i will still be faster than my stock 455 w/ q jet.
    Don't throw the q-jet away until after you find something that runs better. My ol spread bore hit like a mofo on my old 455 olds.
    Another Hot Boat refugee

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    Quote Originally Posted by HammerDown View Post
    Question > if a engine is hitting the wall at 5400 > would the Victor Jr alone give you more RPM?

    How do you know it's not the impeller ?

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    Super Moderator HammerDown's Avatar
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    Quote Originally Posted by Sleeper CP View Post
    How do you know it's not the impeller ?

    S CP
    Let me ask it this way > (if) a engine is hitting the wall (tuned as good as it'll get) at 5400 with a duel plane intake(Stealth) would swapping it for a victor Jr/single plane bring on any more RPM?
    <img src=http://www.performanceboats.com/gallery/data/500/medium/06-30-11_1234.jpg border=0 alt= />

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    gn7
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    Quote Originally Posted by H20MOFO View Post
    Don't throw the q-jet away until after you find something that runs better. My ol spread bore hit like a mofo on my old 455 olds.
    Yeah, carbs tend to give that feeling when the primaries are the size of dimes and the secondaies are the size of silver dollars



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    gn7
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    Quote Originally Posted by HammerDown View Post
    Let me ask it this way > (if) a engine is hitting the wall (tuned as good as it'll get) at 5400 with a duel plane intake(Stealth) would swapping it for a victor Jr/single plane bring on any more RPM?
    Its going to depend alot on the cam. If the cam is done at 5500, then no! But if a spacer under the carb on a dual plane helps, then I would say yes.



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    Last edited by gn7; 10-10-2010 at 09:20 PM.

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    Senior Member YumaJet's Avatar
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    Quote Originally Posted by HammerDown View Post
    Let me ask it this way > (if) a engine is hitting the wall (tuned as good as it'll get) at 5400 with a duel plane intake(Stealth) would swapping it for a victor Jr/single plane bring on any more RPM?
    well here's my .02 cents. i have a bbc 454 with a holley 750dp, victor jr. intake, crane 282 cam and 781 heads. i top out at 5600 rpm's with my motor/pump combo. i reached max rpm's with this cam, so i'll be swapping out cams this winter.

    the only way to know is to buy it and see what it does. if it works, then you will add a few rpm's and if it doesn't, we'll see it for sale in the classifieds.
    boatless....

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    The Good mrjoshua's Avatar
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    will i notice any difference up to say 5200rpm between the two? will there be any jumps as i accelerate smoothly. If i'm reading this right the victor jr will get me higher top end, but will i suffer a "bog" at idle, off idle, of lower cruise rpms on plane say 3400 rpm? I would love the best of both worlds of course. reliablity and ease of set-up and still being able to jump on it hard every once and a while. i'm not gonna say i don't want to go fast.

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    Default i like the victor jr.

    i run a 555cu. dart with aluminum heads etc with a victor jr ,a proformer 850 and pulled 650hp at 6100 ...in runs like a beast around 5500-6100rpm ,just my experience...loves 4100rpm obviously just in my rig

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    ineeddasun, any problems at the lower rpm's? say 3200. if i'm pulling kids on the tube i can't do it a sixty.
    Last edited by mrjoshua; 10-11-2010 at 08:12 PM.

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