Paper vs metal (sintered bronze) fuel filter

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Paper vs metal (sintered bronze) fuel filter

Post by captianworkbench » Fri Dec 08, 2017 11:24 pm

Hey guys and gals, in a thread I posted a little over a year ago I was asking about fuel filters and this related topic kind of wiggled in. I would like to know more about everyone's thoughts on this.

This basically applies to carbed Urals, but I guess could apply to any...

Do you all like to run paper, or the sintered bronze filter elements, and why?

It would seem to me the paper would have the ability to trap finer particles.

What say you?

-CWB

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Re: Paper vs metal (sintered bronze) fuel filter

Post by Snakeoil » Sat Dec 09, 2017 1:13 am

Get the specs for each filter. That will answer your question.
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Re: Paper vs metal (sintered bronze) fuel filter

Post by captianworkbench » Sat Dec 09, 2017 1:34 am

I would agree Snakeoil.

IF one could find the specs on the filter, you could certainly figure out which one had the finest micron rating, and therefore be the "better" filter.
In searching the interwebs I am seeing quite the lack of such information.... finding it on only a few listings.

But, on the other hand, I have a feeling that this may be only part of why some people prefer one style vs the other.

What do you use? Why?

-CWB

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Re: Paper vs metal (sintered bronze) fuel filter

Post by chaos2 » Sat Dec 09, 2017 2:44 am

the nylon mesh filters on the intake tubes are probably sufficient. any additional filter is just icing on the cake. that said I use a couple of the little conical sintered bronze ones cuz the look nice. They're rated 40-60 microns. I think paper filters are about the same.
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Re: Paper vs metal (sintered bronze) fuel filter

Post by hotflash44 » Sat Dec 09, 2017 7:17 am

like Mr snake said, its all about microns.Its the innards that make or break any filter IMHO :cheers:
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Re: Paper vs metal (sintered bronze) fuel filter

Post by VWK75S » Sat Dec 09, 2017 8:01 am

chaos2 wrote: any additional filter is just icing on the cake.
Like a alcohol filter :)
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Re: Paper vs metal (sintered bronze) fuel filter

Post by Lee Pape » Sat Dec 09, 2017 10:14 am

Years ago when the Dodge Viper first came out the place I worked at made the fuel filter/pressure regulator for them. It had a 2 micron stainless steel screen wrapped around a paper filter.
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Re: Paper vs metal (sintered bronze) fuel filter

Post by Snakeoil » Sat Dec 09, 2017 9:10 pm

Love to see the process for making a 2 micron screen.

For a carbureted engine, there is probably a point where finer mesh sizes offer diminishing returns. Smaller means easier to plug up. I would estimate that half the smallest carb passage would be sufficient for reliability, discounting the possible increase in erosion rate if there are a lot of particulates.

When I was working in Saudi back in the early 80's, it was common practice to remove the bronze OEM filter from the carb because the gas was so filthy with dust. We ran nothing in that filter chamber.

Your question peaked my curiosity. Knowing "why" is always important to me. So I did some research and here are the key differences.

Sintered bronze
Cheaper to make
Cleanable for longer service life
Better in high temp applications
Holds less dirt than paper
Self-supporting structure

Paper
More expensive to make
Holds more dirt than SB
Disposible
Requires support structure be built into or around media.
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Re: Paper vs metal (sintered bronze) fuel filter

Post by n3303j » Sun Dec 10, 2017 11:29 pm

131-261-275_vw_universal_fuel_filter.jpeg
I put one of these at each carb. Had no more problems with contamination causing float valve leakage. Large surface area gives good flow even as contaminants build up. Clear case allows easy monitoring of filter and fuel condition. They are cheap to buy. I replace a pair a year.
Filter.jpg
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Re: Paper vs metal (sintered bronze) fuel filter

Post by Mikey » Mon Dec 11, 2017 9:58 am

I like how you can see the condition rather than the all black of the efi filters. Is there a throughput rate on filters? Hate to over tax the pump try I g to push through a low flow filter.
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Re: Paper vs metal (sintered bronze) fuel filter

Post by n3303j » Mon Dec 11, 2017 10:40 am

I'm gravity feed and fuel starvation is never an issue.
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Re: Paper vs metal (sintered bronze) fuel filter

Post by rivers » Mon Dec 11, 2017 2:18 pm

No idea which is technically better? I've always preferred the sintered over paper. Microns are microns... I like the sintered w/o fear of the paper coming apart. Don't know if it's a real issue or not? Prolly not.I've run paper filters enclosed in alum canisters on cars and trucks forever, since 71 or so anyway. I "think?" one of the benefits of sintered is you can get the same filtering efficiency in a smaller package. Remember the sintered cone filters that came on automotive carbs where the fuel line connected? They worked well but plugged quickly cause of their size, hence the reason for running an aux canister/paper filter between the tank and fuel pump. On carded Urals I run the conical sintered like Raceways sells but the one's Ron above has shown should work equally well. Yeah "clear" housing is nice for maint sake.
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Re: Paper vs metal (sintered bronze) fuel filter

Post by Mr Wazzock » Mon Dec 11, 2017 8:18 pm

Mikey wrote:I like how you can see the condition rather than the all black of the efi filters. Is there a throughput rate on filters? Hate to over tax the pump try I g to push through a low flow filter.
As was intimated earlier, the EFI pump sucks thru the filter, not pushes. :D

Problee might get cavitation if was getting blocked I imagine. Replacement interval is 10,000 km I believe.


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Re: Paper vs metal (sintered bronze) fuel filter

Post by Snakeoil » Tue Dec 12, 2017 1:50 pm

No idea which is technically better?
I think for our purposes, whether a FI bike or carbureted, either filter will do the trick. The sintered elements will not have the same surface area as a paper filter and hence will plug quicker. I've never seen a paper element fail in any application from oil filters to huge inlet air filters on 24,000 hp gas turbines. And that includes those with truly pitiful maintenance typical of 3rd world countries. In the case of air filters, even if they are plugged solid, they held up and simply degraded the performance of the unit. So, I would not worry about a paper fuel filter, fed by head pressure from a tank, failing.

For our rigs, I'd worry more about the integrity of the filter vessel and if it can tolerate gasoline and its additives and heat, not to mention vibration and some abuse. A fuel line dumping gas on a hot engine due to a failed filter cannister concerns me more than a little dirt getting past a filter. I think this whole filter discussion is much ado about nothing. But it's winter and we are all prepping for cabin fever.
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Re: Paper vs metal (sintered bronze) fuel filter

Post by windmill » Tue Dec 12, 2017 4:55 pm

Snakeoil wrote:
But it's winter and we are all prepping for cabin fever.
What? :-?

Did I just stumble into a sport bike or Harley form? :o

Winter is the start of the Ural "riding season"! :P
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