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Old 07-31-2018, 05:09 PM
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Quote:
Originally Posted by Truckracer View Post
Strange thread. 60 posts when the summary could be simply “ The in tank filter I have been using seems too restrictive for my engine. I think I will change to one with less restriction.”
+1
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Old 07-31-2018, 05:26 PM
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Strange thread. 60 posts when the summary could be simply “ The in tank filter I have

I will gladly rename it.
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Old 07-31-2018, 06:27 PM
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Originally Posted by Cryhavoc38 View Post
An electric can pump has a bit more "sucking power" available to it than does a walbro carb I would think.

that being said, when I had my 200, I used the large sized walbro felt clunk, not the standard sized and I didn't notice any restrictions. My local Mclendons/Ace hardware store stocked both sizes of the walbro felt clunk so these were always handy to pick up.
Point exactly. If my electric pump can pull more fluid through it than a walbro carb then the felt clunk should have no problem flowing enough.
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Old 07-31-2018, 07:12 PM
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I hammer at 1500 feet
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Originally Posted by torquen View Post
Point exactly. If my electric pump can pull more fluid through it than a walbro carb then the felt clunk should have no problem flowing enough.
I will kindly disagree.


Get two people:

1. a 20 year old with perfect and normal lungs

2. a 90 year old with COPD

ask each one to suck 250 ml of water thru a straw and time it.

Who do you think will win, meaning, be able to suck the 250 ml thru a straw in less time?

A pump that is stronger will suck more and can overcome more than a weaker pump.
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Old 07-31-2018, 07:13 PM
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I hammer at 1500 feet
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Old 07-31-2018, 07:14 PM
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They're get'n lower mate.....
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Rather suck down a Fosters -
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Old 07-31-2018, 07:41 PM
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Quote:
Originally Posted by orthobird View Post
I will kindly disagree.


Get two people:

1. a 20 year old with perfect and normal lungs

2. a 90 year old with COPD

ask each one to suck 250 ml of water thru a straw and time it.

Who do you think will win, meaning, be able to suck the 250 ml thru a straw in less time?

A pump that is stronger will suck more and can overcome more than a weaker pump.
Well my grandpa with copd could suck down a cigar in no time.

But just for giggles. I grabbed my fuel pump and hooked it to a gauge. I believe a walbro carb will pull around 9 lbs. I know for sure it will collapse a DuBro 50 oz tank because I forgot to take my vent plug out one time.

Here is a picture of my fuel can pump at max. If I pinched the line the pump just cavitates. Just like if a felt clunk was not letting enough fuel through.
This converts to about 4.4lbs.
So I really don’t think the felt clunks are restricting the flow our engines need.
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Old 07-31-2018, 08:13 PM
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I ve got a bit going on now, but maybe next week, I can do this test. As suggested by Gary.

I think that will tell, if gravity thru three different clunks:

1. dubro standard heavy duty clunk

vs

2. Felt clunk with the inner metal mesh

vs

3. ceramic clunk.


lets say, 100 cc

and a stop watch.
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Old 07-31-2018, 08:23 PM
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Interesting to note that Walbro's webpage for felt clunk filters (1st link) mentions that they are good for up to 125cc. Maybe they are truly not intended for some of our larger engines.


http://www.walbro.com/products/in-tank-fuel-filters/
http://www.walbro.com/wp-content/upl...lter_PS_EN.pdf
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Old 07-31-2018, 08:55 PM
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Quote:
Originally Posted by orthobird View Post
I ve got a bit going on now, but maybe next week, I can do this test. As suggested by Gary.

I think that will tell, if gravity thru three different clunks:

1. dubro standard heavy duty clunk

vs

2. Felt clunk with the inner metal mesh

vs

3. ceramic clunk.


lets say, 100 cc

and a stop watch.
My guess is that the DuBro will flow the most via gravity. That’s what I run most of the time. Zero filters in the plane. 3 on the fuel can. One inside and two outside.
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Old 07-31-2018, 10:29 PM
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Any thread that garners this much interest is good for FG..not to mention that it's been pretty civil.

I will say that perhaps the lowly clunk will become the next oil thread


Btw here is the walbro clunk I bought for my da170.
Quarter for scale

The material is hard and porous but I won't say its ceramic. More like hard spun plastic or possibly fiberglass??
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Old 08-01-2018, 05:14 AM
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Hi guys

Without even know the end of this test trial I can tell you that felt clank are resistors.
I’m using 2 fuel tank in serious and both used felt clank, when I filled the tanks the last tank used to get the fuel thru the main hose that has the felt clank and it took ages to fill it not to mention that the pump made sounds of “I’m about to explode” so I’ve replaced the felt with regular and what do you know, the pump was very happy and the tanks were filled by half the time.

I will love to see the experiment though.
Cheers.
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Old 08-01-2018, 11:46 AM
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Quote:
Originally Posted by TazmanianDevil View Post
Hi guys

Without even know the end of this test trial I can tell you that felt clank are resistors.
I’m using 2 fuel tank in serious and both used felt clank, when I filled the tanks the last tank used to get the fuel thru the main hose that has the felt clank and it took ages to fill it not to mention that the pump made sounds of “I’m about to explode” so I’ve replaced the felt with regular and what do you know, the pump was very happy and the tanks were filled by half the time.

I will love to see the experiment though.
Cheers.

If I'm not mistaken these filter/clunks are really meant for 'one way flow' of liquid out of the fuel tank into the carb.... if that's true then it's not surprising then that your fuel pump sounded overloaded trying to go the 'other way'.


With a normal clunk (non filtered, non-felt/ceramic/anything) you are basically pumping through another section of tubing...nothing more nothing less.
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Old 08-01-2018, 11:48 AM
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Would you mind sharing the Walbro part number for that filter/clunk?
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Old 08-01-2018, 12:02 PM
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Originally Posted by Hinckley Bill View Post
Would you mind sharing the Walbro part number for that filter/clunk?
Me or Taz.

If me, I see no part number on it and darned if I can find it on Walbro's web site, but I can always go to the store and pick another one up and see if the PN is written on the bag.
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