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flame arresters

  1. #1
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    Default flame arresters

    any thoughts on high flow arrester? ive got the 3 in by 5in type, ive read they dont flow very well, just rtyin to let this thing breath,easy in easy out,how about small holes drilled in the top covers...any thought or experiences with this???

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    why run one at all?...if you have a open engine compartment & a scoop of some sort over your carb, i dont believe you need one! ...where do you live & boat?

    FastRat

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    Senior Member Sharkbit's Avatar
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    I just took most of the "filter" part out of my flame arrestor. Looks kinda like a single screen now.

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    Quote Originally Posted by mikewtx19 View Post
    any thoughts on high flow arrester? ive got the 3 in by 5in type, ive read they dont flow very well, just rtyin to let this thing breath,easy in easy out,how about small holes drilled in the top covers...any thought or experiences with this???
    I also have the way too tiny 3x5 (only size that will fit my scoop) and thought about doing that too but, maybe it would cause turbulent air entering the carb???
    <img src=http://www.performanceboats.com/gallery/data/500/medium/06-30-11_1234.jpg border=0 alt= />

  7. #5
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    Quote Originally Posted by Sharkbit View Post
    I just took most of the "filter" part out of my flame arrestor. Looks kinda like a single screen now.
    How did you do that???
    <img src=http://www.performanceboats.com/gallery/data/500/medium/06-30-11_1234.jpg border=0 alt= />

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    Senior Member bp298's Avatar
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    stock barbon spark arrestors are VERY restrictive. they're glued together. very carefully, break the glue seal and pry the top and bottom off the layered screen, unroll the screen, cut it so there is one layer around the bottom. glue the top/bottom to the single layer, and you're done.
    also, i have k&n elements, part number E-3403, that snug fits perfectly around the barbon. i've been using this setup for decades, have tested on/off the dyno with no noticable difference in power.
    every time i pull these things off to check carbs, the carbs are perfectly clean.
    on the other hand, the k&n's get pretty filthy, and need to be cleaned once or twice a year, per k&n's instructions.

    and no one can say i'm not running a spark arrestor. it just happens to be surrounded with an air cleaner...

  9. #7
    Super Moderator HammerDown's Avatar
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    Quote Originally Posted by bp298 View Post
    stock barbon spark arrestors are VERY restrictive. they're glued together. very carefully, break the glue seal and pry the top and bottom off the layered screen, unroll the screen, cut it so there is one layer around the bottom. glue the top/bottom to the single layer, and you're done.
    also, i have k&n elements, part number E-3403, that snug fits perfectly around the barbon. i've been using this setup for decades, have tested on/off the dyno with no noticable difference in power.
    every time i pull these things off to check carbs, the carbs are perfectly clean.
    on the other hand, the k&n's get pretty filthy, and need to be cleaned once or twice a year, per k&n's instructions.

    and no one can say i'm not running a spark arrestor. it just happens to be surrounded with an air cleaner...
    Thanks...I'm going to experiment with mine

    As mentioned prior, only a little 3x5 oval will fit into my seemingly large scoop...OR...something oblong like 3" tall x 5" wide x maybe 8-12" long > but it MUST use the center carb stud for mounting.

    <img src=http://www.performanceboats.com/gallery/data/500/medium/06-30-11_1234.jpg border=0 alt= />

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    Quote Originally Posted by bp298 View Post
    stock barbon spark arrestors are VERY restrictive. they're glued together. very carefully, break the glue seal and pry the top and bottom off the layered screen, unroll the screen, cut it so there is one layer around the bottom. glue the top/bottom to the single layer, and you're done.
    also, i have k&n elements, part number E-3403, that snug fits perfectly around the barbon. i've been using this setup for decades, have tested on/off the dyno with no noticable difference in power.
    every time i pull these things off to check carbs, the carbs are perfectly clean.
    on the other hand, the k&n's get pretty filthy, and need to be cleaned once or twice a year, per k&n's instructions.

    and no one can say i'm not running a spark arrestor. it just happens to be surrounded with an air cleaner...
    I just did this modification to my 3x5.75 Barbon Spark Arrestor > simply a great idea!
    I only left two turns/layers in the mesh...can't wait to try it.
    I bet I won't hear that turbo whistle sound (starving for air) when I get over 5K anymore.
    <img src=http://www.performanceboats.com/gallery/data/500/medium/06-30-11_1234.jpg border=0 alt= />

  11. #9
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    So wouldn't it be simpler to just buy a K&N flame arrestor?

    "Marine Approved per SAE J1928 Flame Arrestor Standard
    Coast Guard Regulations stipulate that all gasoline-powered watercraft be equipped with flame arrestors. Until now, that meant choosing between a Coast Guard citation or restricted airflow. The K&N Flame Arrestor eliminates the need to choose. K&N’s Flame Arrestor is the performance and safety product that boat owners have been waiting for."


    http://store.knfilters.com/marine/flamearrester.htm

  12. #10
    Senior Member nick's Avatar
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    I recently changed my 3x5" flame arrestor to a 5x8" that i found on Summit.com. (http://www.summitracing.com/parts/HLY-720-13/?rtype=10)


    I did this because I figured that with a larger filter there would be more surface area thus resulting in more flow. I am not sure how much of a differance this actually made though.

    The larger 5x8" filter DOES fit inside the standard single carb polished aluminum dooley style scoop that everybody runs in case you guys were wondering, it actually fills it up very nicely. Sorry no documented improvements in power though.

    Just my $0.02

  13. #11
    Senior Member CK7684's Avatar
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    On mine, the air filter is what holds the scoop in place, so having the stiff flame arrestor in place helps this. Paper filters just got crushed. I tried mine with and without the arrestor and didnt notice any change, but then, I also believe that my carb is too small...
    Not sure how well they flow, but some of them are rated for CFM...I think mine is like 5x4 or something like that. Just barely fits inside my scoop...

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    Quote Originally Posted by Real McCoy View Post
    So wouldn't it be simpler to just buy a K&N flame arrestor?
    http://store.knfilters.com/marine/flamearrester.htm
    No way to get anything wider that a 5.75wide x 3 tall arrestor in my scoop...it just won't happen. Now, with only two screen wraps I can't imagine any negative flow affects starving the engine for air > and from 4800 up I could hear the thicker Baron arrestor whistling.

    I could fit a longer oval/oblong such as 3"tall x 5.75 wide x 7to8" long but, I feel bp298 mod saved the day.
    <img src=http://www.performanceboats.com/gallery/data/500/medium/06-30-11_1234.jpg border=0 alt= />

  15. #13
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    Quote Originally Posted by CK7684 View Post
    On mine, the air filter is what holds the scoop in place, so having the stiff flame arrestor in place helps this.
    Yup > same deal with me.
    <img src=http://www.performanceboats.com/gallery/data/500/medium/06-30-11_1234.jpg border=0 alt= />

  16. #14
    Senior Member 91foxbody's Avatar
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    i think i might have to try this mod on my TINY flame arrestor. i swear it is 5"x2"

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