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Post by urbantangleweed on Apr 21, 2024 10:38:40 GMT 1
Every so often, we all see on various bike forums the old "don't fit a filter, it will starve your engine of petrol/oil". Well, does it, and if so by how much and, are different types of filters, well, different? Right, lab coat firmly on..... Two types of filter tested, the regular common all garden square plastic type, and an all singing all dancing posh ally type with a bronze filter insert. Both have 8mm unions. Both tested with straight petrol then 2 stroke oil. Time elapsed is for 140ml of fluid to pass through. Results under the pictures.....    Tests were done with no filter, then the square and ally ones: For petrol, the square filter flowed 20% slower but the ally one was 0% slower For 2T oil, the square filter flowed 60.7% slower, the ally one was 7.14% slower. So there you have it. I suppose the question now is how slow is too slow...... |
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Post by shaunthe2nd on Apr 21, 2024 10:46:31 GMT 1
And how slow when the filter is half full of crap.
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Post by urbantangleweed on Apr 21, 2024 10:51:46 GMT 1
And how slow when the filter is half full of crap. 🤷🏻♂️ |
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Post by steve63 on Apr 21, 2024 11:10:10 GMT 1
Where does the debis that you are trying to stop come from is my question? When my RGV tank had rust in the bottom no matter what I did the petrol filter I fitted would eventually clog and starve the engine. Very fine dust like particles would still get through even with a filter.
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Post by urbantangleweed on Apr 21, 2024 12:04:09 GMT 1
Where does the debis that you are trying to stop come from is my question? When my RGV tank had rust in the bottom no matter what I did the petrol filter I fitted would eventually clog and starve the engine. Very fine dust like particles would still get through even with a filter. I suppose it's down to what micron the holes in the filter are? |
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Post by urbantangleweed on Apr 21, 2024 12:05:11 GMT 1
And how slow when the filter is half full of crap. But at that point, you just pop a new filter on? |
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Post by muttsnuts on Apr 21, 2024 14:15:08 GMT 1
the problem isn't so much fitting a filter to the petrol line, its mostly people fit the wrong size and starve the carbs of fuel, I'd say 80% to 90% of the bikes I've had in with filters fitted, when I've checked them have had smaller holes than the tap/pipe
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Post by tony2stroke on Apr 21, 2024 14:27:57 GMT 1
What is the bore of the filters ?
I know the standard tap is 5mm bore.
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Post by tony2stroke on Apr 21, 2024 15:03:48 GMT 1
I had a problem using 2 inline filters on my RD200.
It would for some reason cause an air lock to form very quickly, then starve of fuel.
Take the fuel pipe off, put it back on, bike would start and run fine again, until air lock built up again and starve it, as soon as you took pipe off the carb, the fuel would flow again.
I don't understand what was happening or why, I can't see a reason for it.
I tried blowing into the tank when air lock formed to force it out, no joy.
The air lock formed in the filters.
I did notice that the filters shook a lot.
Soon as removed, problem went, same as others have confirmed to me in the past.
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Post by urbantangleweed on Apr 21, 2024 16:01:31 GMT 1
What is the bore of the filters ? I know the standard tap is 5mm bore. Ally is 4.1mm ID, plastic is 3.6mm ID |
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Post by tony2stroke on Apr 21, 2024 16:40:48 GMT 1
What is the bore of the filters ? I know the standard tap is 5mm bore. Ally is 4.1mm ID, plastic is 3.6mm ID The taps inlet from the tank is 5mm also. So a 5mm bore feeding both 5mm bore outlets. Just measured the plastic tap filter outlet too, 5mm. In theory 3.6mm shouldn't restrict the flow needed to the carbs, I mean 2 x 3.6mm outlets should be able to flow more than the single 5mm feed can supply, or this is what I would expect. Or am I missing something. |
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Post by urbantangleweed on Apr 21, 2024 19:03:32 GMT 1
Ally is 4.1mm ID, plastic is 3.6mm ID The taps inlet from the tank is 5mm also. So a 5mm bore feeding both 5mm bore outlets. Just measured the plastic tap filter outlet too, 5mm. In theory 3.6mm shouldn't restrict the flow needed to the carbs, I mean 2 x 3.6mm outlets should be able to flow more than the single 5mm feed can supply, or this is what I would expect. Or am I missing something. I only did it out of pure curiosity and for a bit of fun. |
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Post by JonW on Apr 22, 2024 13:51:05 GMT 1
The ally one is a copy of the Pingel I guess? I wonder how different a real Pingel would be.
Urbantagleweed is the Project Farm of the forum! "We're gonna test that!"
(for those who know the youtube channel)
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Post by urbantangleweed on Apr 22, 2024 14:07:04 GMT 1
The ally one is a copy of the Pingel I guess? I wonder how different a real Pingel would be. Urbantagleweed is the Project Farm of the forum! "We're gonna test that!" (for those who know the youtube channel) 🤣😂🤣 My life motto: "If it ain't broke, fix it 'till it is" |
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