intake noise
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intake noise

  1. #1
    gets 'em wet ultrajet's Avatar
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    Default intake noise

    Is it normal to get a "whistling" noise at the carb/scoop when accelerating? My boat seems to be doing this alot more than normal lately and it freaks the wife out. I assume running the scoop backwards will solve this problem, correct?

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    Senior Member jetboatperformance's Avatar
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    Ultra most "whistle noise's" from carbs over the years relate to small vaccum leaks either internal or external to the carb itself What carb is itTom

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    Quote Originally Posted by jetboatperformance View Post
    Ultra most "whistle noise's" from carbs over the years relate to small vaccum leaks either internal or external to the carb itself What carb is itTom
    I know it's a Holley. Here are some pics maybe you can help me ID it or where I might need to look. I'm still learning. Any help/advice I can get would be greatly appreciated!









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    Senior Member Widetrack's Avatar
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    To know what you have. Pull scoop and element off where the choke horn stands up on the carb. there should be a list no. that will tell what the carb size is! WT


    SOMEONE SAID YOU CAN'T TAKE IT WITH YOU! SO,IM BURNING IT UP ONE GALLON AT A TIME!
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    Senior Member H20MOFO's Avatar
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    I think the # is under the plame arrestor on the vert surface. Take a pic of that and I'll bet someone can tell ya what it is. RE the whistling noise mine does it for a second when I get out of the throttle.
    Another Hot Boat refugee

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    Senior Member djmadmatt's Avatar
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    What intake is that?

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    Super Moderator HammerDown's Avatar
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    When I kick in the secondaries my wire mesh flame arrestor makes that "whistling noise"...nothing more or less.
    <img src=http://www.performanceboats.com/gallery/data/500/medium/06-30-11_1234.jpg border=0 alt= />

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    Senior Member djmadmatt's Avatar
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    Run it without the flame arrester so you can make sure that its not causing it. Could be the gasket between the carb and the intake too.

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    Sit N' Spin Jetaholic's Avatar
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    Not meaning to thread jack, but that is a rather small flame arrestor. I too ran one that exact same size...was turning an American Turbine AB impeller 5100RPM. I changed it out to a 5 3/4" x 3" tall flame arrestor and gained 300RPM just from that alone. That really showed me just how much those short ones really choke the motor and kill performance. A 5 3/4" x 3" one should fit in your scoop just fine.

    Also, with a bigger flame arrestor that very well may kill your whistling noise since the motor won't be having to fight as hard to get air.

    Sorry for the thread jack.



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    Well I am putting in a nice stereo system in the Carrera...maybe Ill put on some rap and turn the scoop sideways

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    Quote Originally Posted by Jetaholic View Post
    Not meaning to thread jack, but that is a rather small flame arrestor. I too ran one that exact same size...was turning an American Turbine AB impeller 5100RPM. I changed it out to a 5 3/4" x 3" tall flame arrestor and gained 300RPM just from that alone. That really showed me just how much those short ones really choke the motor and kill performance. A 5 3/4" x 3" one should fit in your scoop just fine.

    Also, with a bigger flame arrestor that very well may kill your whistling noise since the motor won't be having to fight as hard to get air.

    Sorry for the thread jack.
    Hey, I appreciate any advice I can get. I used to run the scoop backwards and never heard a thing, but boat looks better with frontward scoop IMO. I'll try something simple like changing out the arrestor as you suggested, and maybe even running it w/o the thing like DJMM suggested above. Hopefully, it is something that simple. The noise really doesn't bother me much but if something is wrong with the carb, I want to figure it out somehow. Thanks guys for all the info!

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    Senior Member watergun4u's Avatar
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    I read this post and thought I would put my .02 in I was having the same noise you are say that your having and found it to be one of the rubber plug's on the carb had a little crack in it, causing a leak, and was making that whistling sound, after finding that and replacing it took care of the noise, so you might want to check that out as well, Also I noitced in your pic's that the air fuel mixture screw seems to be leaking you might be picking up a vac leak from there as well just a cork o ring in there change those out and if not the problem, it will fix the leak,, just be sure to count the number of turn out so you can put it back in the same way! the best way to do it is, count the number of turn's it takes to screw it in till it stops, and after replacing the cork o ring screw it back in till it stops and then unscrew it the amount of turns it took you to screw it in the first time should be about 3/4 to 1 turn out from a seated postion, then I would just go through and check all the mounting bolts and carb bolts to be sure all it tight and not causing a leak!!!!!! Again just my .02
    Tye

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    Quote Originally Posted by djmadmatt View Post
    What intake is that?

    looks to me like a Edelbrock performer intake with a Holley 9015-1 vac sec electric choke 750CFM
    carb
    #55

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    21 Daytona Outlaw's Avatar
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    oh and I'm with Hammer on the secondaries making the noise
    #55

  16. #14
    cfm
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    Air rushing past secondary throttle plates when just open to about 1/4 or so open.

    Pretty normal with Holley/BG vac secondary carbs.

    I have one that sounds like a belt slipping. Does it without the arrestor too.

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