What is more restrictive?
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What is more restrictive?

  1. #1
    AKA OhOneWS6 Last Mohican's Avatar
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    Default What is more restrictive?

    The screen type flame arrestor or the ones that are a bunch of staggered flat plates. For comparison sake lets say they are both the same dimensions in height and circumference.


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    Last edited by Last Mohican; 12-25-2010 at 09:20 AM.

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    Member neverenuf's Avatar
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    I would say the stacked is way more restrictive. I have the screen version 3" tall....works well inside my Bassett scoop and keeps the LP happy. There was a discussion here a couple months ago on this very subject...you might do a search for it....Some guys have been removing the inner screen to improve the flow...Details are in the thread on this mod...Merry Christmas Matt!

  4. #3
    AKA OhOneWS6 Last Mohican's Avatar
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    My initial thought was the plate style was more restrictive but I seem to remember an article saying the plate style ones were less restrictive. I was hoping someone actually had some flow numbers on them.

    Off subject but when THB comes back up be sure to check out the One Owner CV-23 thread. I thought you might be interested in it.

    Merry Christmas Frank.

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  6. #4
    Member neverenuf's Avatar
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    Hope you find that thread on the flame arrestors....good reading!

    Saw the CV 23 on THB, nice ride! My wife is not willing to give up her pontoon boat just yet.

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    Super Moderator HammerDown's Avatar
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    With the wire mesh piece I did a nice little mod > my Baron SA had some nine windings inside > I removed all but two...that's if, you want the option to modify it.
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  8. #6
    AKA OhOneWS6 Last Mohican's Avatar
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    Quote Originally Posted by neverenuf View Post
    Hope you find that thread on the flame arrestors....good reading!

    Saw the CV 23 on THB, nice ride! My wife is not willing to give up her pontoon boat just yet.
    Was it this one?

    http://www.performanceboats.com/show...lame-arresters

  9. #7
    AKA OhOneWS6 Last Mohican's Avatar
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    I'm going to try to find someone local that will test them on a flow bench for me. Either that or I'll build something similar to a K&N flow demonstrator and test them myself. I'll post results if I ever get to it.

    http://www.jegs.com/i/K%26amp%3BN/59...124-2/10002/-1

  10. #8
    Senior Member hotkona's Avatar
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    Default What is more restrictive

    It seems to me, that I've heard a K&N Filter will pass for a flame arrestor. Anybody else know?
    In thrust, we trust

  11. #9
    Senior Member Schiada 201's Avatar
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    I drilled some holes on the top plate, works well.
    Last edited by Schiada 201; 12-28-2010 at 12:00 AM.

  12. #10
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    Quote Originally Posted by hotkona View Post
    It seems to me, that I've heard a K&N Filter will pass for a flame arrestor. Anybody else know?
    Yes, K&N has air filters that pass the marine flame arrestor tests. The marine units are stainless steel and have the Coast Guard number stamped in the edge of the base. From thier site:

    "The K&N Flame Arrestor makes the world’s leading air-filtration technology available for marine engine use. For the first time, boat owners can experience the increased horsepower and engine protection provided by K&N's unique oiled cotton gauze and epoxied screen filter element. For high performance on the water, no other product can match the "horsepower-per buck" benefits of the K&N Flame Arrestor."

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

    Doug

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    There are VERY few flame arrestors that will flow what their intended carbs flow, unless modified. The problem is when you modify them, you lose the CoastGuard certification. There are airflow issues with several popular scoops too. I have tested some beautiful looking and expensive units that are junk from an airflow perspective. I have a Superflow flow bench and am in the West Phoenix,AZ. area, call me and bring your stuff and your friends stuff too! NO CHARGE!!! TIMINATOR 623-877-8553
    MODESTY IS A CRUTCH FOR THE INCOMPETENT!

  14. #12
    AKA OhOneWS6 Last Mohican's Avatar
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    Quote Originally Posted by TIMINATOR View Post
    There are VERY few flame arrestors that will flow what their intended carbs flow, unless modified. The problem is when you modify them, you lose the CoastGuard certification. There are airflow issues with several popular scoops too. I have tested some beautiful looking and expensive units that are junk from an airflow perspective. I have a Superflow flow bench and am in the West Phoenix,AZ. area, call me and bring your stuff and your friends stuff too! NO CHARGE!!! TIMINATOR 623-877-8553
    Wish I was closer Tim I'd take you up on that. Phoenix is a long way from Dallas just to check air flow on a flame arrestor. Maybe someone closer has one of each type they could bring by. I still want to know some actual numbers on which is more restrictive.

  15. #13
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    The plate type is more suseptable to flow loss from dirt than the aftermarket screen type. Its the design of the base that has as much difference in flow as does the plate or screen design, I have seen cases in which either type can outperform the other in the same sized unit. A 10" diameter by 3 1/2" stainless steel, expensive, screen type that I bought for a Dominator only flowed about 900 cfm, I modified the base and got that to about 975, then I experimented with the screens. There was 6 complete wraps of screen, I had to remove all but two to get the flow up to 1300 cfm, because the carb was modified to flow about 1200 cfm. The Coast guard cert wasn't relevant because there wasn't an engine cover, and all I cared about was keeping the low flying birds and Bikini tops out of the carb. For lake testing I run two passes each way on the RADAR gun, or GPS with and then without the flame arrestor or scoop, its not as easy as a flowbench but it will tell ya if ya need something different. TIMINATOR
    MODESTY IS A CRUTCH FOR THE INCOMPETENT!

  16. #14
    Senior Member CK7684's Avatar
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    I have a cheap one and there wasn't much screen. I tried it with and without and didnt notice and changes on my mild combo...

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