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Old 20-06-2019, 06:28   #1
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Engine intake foam filter burns quite easily

Should i be worried that foam material I bought on amazon
burns quite easily. Type I got is Uni Filter BF-2 foam intended for fabricating engine air filters.
https://www.amazon.com/Uni-Filter-BF.../dp/B000ONZT5Y

It was when i was sewing it into round form to fit my intake and burning thread ends that i noticed is sustains flames quite easily.
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Old 20-06-2019, 06:34   #2
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Re: Engine intake foam filter burns quite easily

The mesh metal flame arrestor is used as an air filter on my gasoline engines.

A flammable foam filter would not be appropriate in my application.
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Old 20-06-2019, 07:13   #3
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Re: Engine intake foam filter burns quite easily

Flame spread index rated material ?

https://www.foambymail.com/blog/unde...-e84-standard/
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Old 20-06-2019, 07:57   #4
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Re: Engine intake foam filter burns quite easily

On a Diesel it shouldn't be an issue, but just replace it with a K&N and be done with it, they are acceptable as a flame arrestor for gasoline engines.
But I bet as its oil soaked gauge it will burn too?
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Old 20-06-2019, 08:54   #5
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Re: Engine intake foam filter burns quite easily

Where was it made, and does it list any flame resistant properties?


If possible I would not use it IF there are alternatives that are more flame resistant.
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Old 20-06-2019, 09:58   #6
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Re: Engine intake foam filter burns quite easily

Speak to the wise guys at K&N and get a washable reusable air filter for your engine. I did this for my Volvo Penta D2-40 and while I can't say if the performance has improved the fact I'm not forking out £50 a pop for a replacement element sealed in a plastic body is worth the investment.

They will need the capacity and swept volume of your engine to determine which filter is best but that should be available in your engine manual.

Simples
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Old 20-06-2019, 11:12   #7
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Re: Engine intake foam filter burns quite easily

Quote:
Originally Posted by a64pilot View Post
On a Diesel it shouldn't be an issue, but just replace it with a K&N and be done with it, they are acceptable as a flame arrestor for gasoline engines.
But I bet as its oil soaked gauge it will burn too?
Both gas and diesel can backfire through the intake. It's good to know that the k&N can handle that situation.
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Old 20-06-2019, 13:27   #8
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Re: Engine intake foam filter burns quite easily

Don't be too sure about K&N. Their ads (at least used to) say guaranteed horsepower gain. Well, in another car forum that was being debated (turned out OEM was actually better than all aftermarket for a stock engine) and I asked someone at K&N about what the gain was for these particular cars. They said they didn't know, couldn't promise it, wouldn't supply one for dyno testing. (In other words, they weren't interested in even finding out.)

They're a little short on numbers, when it comes to particulate size trapped versus flow rates and other real criteria.

MOST foams today are basically napalm, once lit up they keep on burning. I don't know about the older latex foam but almost everything on the market today is a polyurethane variant and while some have flame inhibitors added to them, that's a whole other question.

The metal mesh on gasoline engine air filters is a *spark* and flame arrestor, designed to quench a brief fire flashover by the metal stealing the heat from it. It won't really stop a good burn from going through. I kinda doubt the usual oiled K&N element would either.

The Amazon description says this foam is for ATVs, which are generally unregulated. And it is made of polyurethane, which makes great fire starter. Of course if your engine ingests it, that will just let it burn smoother.(G)
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Old 20-06-2019, 14:15   #9
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Re: Engine intake foam filter burns quite easily

K&N have been around for an awfully long time, is there a fire risk problem with their filters? I would have thought anything would have come to light now. Why did I fit mine? well the K&N from the universal range cost me £30. Volvo wanted £130, although they can be cleaned apparently.

First take a bucket of diesel and then flush the filter through for a while. Allow to dry for some time, dispose of the contaminated diesel responsibly and fit the manky filter back on again hoping for the best. Or spend £30.

Doubtful there is any performance to be gained on the average yacht engine. Would you notice a 5% gain on a 28hp engine that is 30 years old? probably best to fit and just allowed to do its job, stopping FOD entering the air intake.

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Old 20-06-2019, 14:20   #10
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Re: Engine intake foam filter burns quite easily

Rather than trying to fab your own, just buy a K&N and be done w it. Ive been running them for years. Never had one burst into flames. Clean, reuse, no problems. Lasts for years.
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Old 20-06-2019, 15:25   #11
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Re: Engine intake foam filter burns quite easily

don't have room in my round canister for anything other than rolling a stripe of foam around the metal cage.... It's a Universal M 18 diesel engine. I unearthed some packaging foam which looked porous enough and that's it for now.
Any info about a better solution?
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Old 20-06-2019, 15:30   #12
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Re: Engine intake foam filter burns quite easily

Take the pan off and see if it has a stub of intake tube the K&N will just slide on to.

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Old 20-06-2019, 17:30   #13
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Re: Engine intake foam filter burns quite easily

My 35 year old Perkins is in great shape with very good compression, it only came with a coarse screen. These engines are not run in a dry dusty environment that needs more filtering
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Old 20-06-2019, 18:06   #14
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Engine intake foam filter burns quite easily

I have a long history with K&N from working with them for am ENCU filter for the A model Apache (encu is environmental control unit or air conditioner) to the engine inlet filter for the Thrush crop duster.
Attached picture is of my Daughter in front of the filter used for the turbine engine Thrush crop duster, I was putting together a class on how to clean them. These arenít cheap as you can imagine, but will last a long time if properly cleaned, but once improperly will destroy it.
Anyway , only use soap, best to use the K&N soap, then let it dry completely out of the sun, itís cotton gauge and sunlight will apparently shrink cotton.
Then only use K&N oil, the oil is the ďmagicĒ itís what traps the dirt, itís sticky, the gauge only holds the oil, do not use pressurized water to clean or high pressure air, you will blow out the gauge.
Look for an even red color, you really canít over oil the excess will just drain away making a mess, but it wonít hurt anything.
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Old 20-06-2019, 18:11   #15
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Re: Engine intake foam filter burns quite easily

Quote:
Originally Posted by jharding View Post
My 35 year old Perkins is in great shape with very good compression, it only came with a coarse screen. These engines are not run in a dry dusty environment that needs more filtering
boat engines are never exposed to heavy dusty environment as is a Caterpillar grader or demo excavator(!)
Why then obsess on super fine and $$ filtration issues?
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