spark arrestor on intake??

[lethalwillie]

does anyone actually know the theory behind using just a wire mesh screen over the intake, as opposed to something to prevent water (and some dust) from entering the motor? haven't talked to pcm yet but the only thing i can think of is extra horsepower?? thanks.

[balair]

What boat and engine do you have?

[Razzman]

TO the best of my knowledge the flame arrestor in theory prevents flame from exiting the carb in the event of a backfire. The reason for not having a filter element is that it would catch fire and if any fuel vapors are present then obviously ignite. Dust really isn't an issue on a boat as the motor is in a fairly sealed environment hence the need for a bildge blower.

[raythompson]

does anyone actually know the theory behind using just a wire mesh screen over the intake, as opposed to something to prevent water (and some dust) from entering the motor? haven't talked to pcm yet but the only thing i can think of is extra horsepower?? thanks.

The theory is that there is not much dust or other debris on the water so an air filter is not necessary. It also reduces the airflow somewhat and marine engines while working demand a lot of air as the engines are under a heavy load.

But because the engine is in an enclosed space where fumes can accumulate the Coast Guard mandates some type of flame protection from backfiring. The screen fits that need. Any flame belched through the intake manifold will be quenched by the screen. The screen absorbs a lot of the heat and this will control such backfire flame discharge. Of course a constant flame signals other real problems of the ASI (abandon ship immediately) variety.

A screen is quite effective to block flames. Such a screen was mandatory in my younger days when igniting farts to avoid really painful and serious backflash.

[chpthril]

does anyone actually know the theory behind using just a wire mesh screen over the intake, as opposed to something to prevent water (and some dust) from entering the motor? haven't talked to pcm yet but the only thing i can think of is extra horsepower?? thanks.

A "Spark Arrestor" is just that, a means to contain an engine back fire and is required by the USCG. Removal will get you a ticket and or the denial of a fire claim by your insurance co.

[rogersbm82]

You are killing me Willie!

[dtown]

water block idea

In snowmobiling we use a prefilter "sock" that goes over the airfilter. It prevents snow and ice from building up on the filter foam. It doesn't let water or snow through, but allows air through freely. Maybe you could get some of this prefilter material and just put it around the spark arester intake?
here is a link.
http://www.startinglineproducts.com/...&productID=411

[dtown]

You are killing me Willie!

"You are being very un-Dude, Dude!" -bonus points for naming the movie.

More TO less WW

[rogersbm82]

I am usually the king of movie quotes but it is late over here and I am tired. Past my bedtime.
Maybe this is a test though, maybe God is testing my patience today. lol Or maybe it's the fact I haven't had sex in 6 months. I think a little of both.

And sorry for being un-dude but this guy is killing me with this whole spark arrestor design flaw blabling. He just won't give up.

[noworries]

There just have never been issues (till now, apparently) with water entering engines through the carburetor or equivalent on marine engines. Screens to prevent backfire-related fires have been required by the USCG (at least on enclosed engines) for many decades.

Please describe or show pictures of the design of your intake snorkel that apparently sucked up water.

[dtown]

"You are being very un-Dude, Dude!" -bonus points for naming the movie.

Big hint for the same movie... "Saturday, Donny, is Shabbos, the Jewish day of rest. That means that I don't work, I don't get in a car, I don't ******* ride in a car, I don't pick up the phone, I don't turn on the oven, and I sure as s**t don't f**king roll! SHOMER SHABBOS!"

OK sorry

[rogersbm82]

Oh yeah now I remember, how could I forget?
"Shut the F**k up Donny...............Donny you are way out of your element!"
"It's a ringer....my dirty underwear."

[lethalwillie]

In snowmobiling we use a prefilter "sock" that goes over the airfilter. It prevents snow and ice from building up on the filter foam. It doesn't let water or snow through, but allows air through freely. Maybe you could get some of this prefilter material and just put it around the spark arester intake?
here is a link.
http://www.startinglineproducts.com/...&productID=411

thanks dtown. looks like a good option.

[lethalwillie]

There just have never been issues (till now, apparently) with water entering engines through the carburetor or equivalent on marine engines. Screens to prevent backfire-related fires have been required by the USCG (at least on enclosed engines) for many decades.

Please describe or show pictures of the design of your intake snorkel that apparently sucked up water.

didn't really suck it up, just splashed up the back wall onto the screen, then sucked in apparently.

i can't just insert a pic can i? i can't figure out how???

[xpjim1]

Have the picture on your computer

Go Advanced on your post reply

scroll down to additional options, manage attachments. when it opens hit browse, select your picture, then upload. type your message and hit submit reply