logo
Thread Tools
Old 07-30-2018, 01:22 PM
ghoffman is online now
Find More Posts by ghoffman
Registered User
ghoffman's Avatar
New Hampshire, USA
Joined Nov 2009
8,044 Posts
You can look it up here:

http://www.hollandapt.com/Documents/...2010827381.pdf
ghoffman is online now Find More Posts by ghoffman
Reply With Quote Quick reply to this message
Sign up now
to remove ads between posts
Old 07-30-2018, 01:44 PM
Truckracer is online now
Find More Posts by Truckracer
Registered User
Des Moines, Iowa USA
Joined Nov 2007
4,787 Posts
I haven't checked in awhile but some years ago the same info was circulated about felt filters releasing fibers. It was discovered then it almost couldn’t happen with a Walbro felt clunk. There was (hope still is) a mesh material inside the filter that prevents felt fibers from going into the fuel line. I know I have never had any fibers in a carb screen before either on an RC airplane or chainsaw.

There are certainly more filter choices today than in the past. I certainly wouldn’t be affraid to use most any filter from Stihl or Husqvarna.
Truckracer is online now Find More Posts by Truckracer
Reply With Quote Quick reply to this message
Old 07-30-2018, 02:40 PM
closetguy is online now
Find More Posts by closetguy
Registered User
United States, OH, Berlin Heights
Joined Jul 2006
4,865 Posts
Quote:
Originally Posted by Warwix View Post
I've been running dual V2 Fortitude tanks with their stock felt clunk for two seasons now on my 200 and I haven't had a single hiccup. Not sure how it could work any better.


Same here no complaints and no fuzz in the carb screen.
closetguy is online now Find More Posts by closetguy
Reply With Quote Quick reply to this message
Old 07-30-2018, 07:04 PM
orthobird is online now
Find More Posts by orthobird
I hammer at 1500 feet
orthobird's Avatar
United States, LA, Shreveport
Joined Apr 2012
8,202 Posts
Quote:
Originally Posted by ghoffman View Post
It would be pretty simple to measure the flow. Put the tank on the table and with a stop watch and using gravity, see how long it takes to fill a cup.
Quote:
Originally Posted by Truckracer View Post
I haven't checked in awhile but some years ago the same info was circulated about felt filters releasing fibers. It was discovered then it almost couldn’t happen with a Walbro felt clunk. There was (hope still is) a mesh material inside the filter that prevents felt fibers from going into the fuel line. I know I have never had any fibers in a carb screen before either on an RC airplane or chainsaw.

There are certainly more filter choices today than in the past. I certainly wouldn’t be affraid to use most any filter from Stihl or Husqvarna.


yes, the walbro has this very fine metal mesh between the felt and the nipple housing. And yes, this too is restrictive. And if felt gets on the mesh, which is extremely fine, then it will also be more restrictive.
orthobird is online now Find More Posts by orthobird
Last edited by orthobird; 07-30-2018 at 07:12 PM.
Reply With Quote Quick reply to this message
Old 07-30-2018, 07:08 PM
orthobird is online now
Find More Posts by orthobird
I hammer at 1500 feet
orthobird's Avatar
United States, LA, Shreveport
Joined Apr 2012
8,202 Posts
Quote:
Originally Posted by Vapor Trails View Post
Thank s guys.
Are there any reasons not to use Viton all over (not just inside the tank)?

Are there any scenarios when you would not want to use Viton?
To answer your question, the advantage of using tygon on the outside is, that you can see if any air leaks, there will be air bubbles.

With Viton, you will never be able to see if there are air bubbles in the system past the tank.
orthobird is online now Find More Posts by orthobird
Reply With Quote Quick reply to this message
Old 07-30-2018, 10:21 PM
Hinckley Bill is online now
Find More Posts by Hinckley Bill
Registered User
Hinckley Bill's Avatar
Hinckley Illinois
Joined Jan 2006
2,182 Posts
So I decided to take a Walbro fuel filter (clunk) apart and examine it closely.....this is the part number Walbro 125-527-1


First picture is of all components separated


Second picture is of the internal post on which the felt pieces are placed, and through which the gas flows


The third picture is the metal filter that filters ALL the gas prior to its introduction into the tubing that eventually makes its way to the carb.


I gotta tell you, looking at that metal filter I'm wondering what, if anything (including 'bits of felt') could ever pass through that
Hinckley Bill is online now Find More Posts by Hinckley Bill
Reply With Quote Quick reply to this message
Old 07-31-2018, 07:59 AM
ghoffman is online now
Find More Posts by ghoffman
Registered User
ghoffman's Avatar
New Hampshire, USA
Joined Nov 2009
8,044 Posts
Wow, it is hard to see anything getting through that, including gasoline, I will be interested in seeing some flow numbers.
ghoffman is online now Find More Posts by ghoffman
Reply With Quote Quick reply to this message
Old 07-31-2018, 08:16 AM
tande is offline
Find More Posts by tande
Registered User
tande's Avatar
United States, MI, Millington
Joined Sep 2008
1,514 Posts
Yes, WOW! .......I had NO idea they included an internal filter! .....
tande is offline Find More Posts by tande
Reply With Quote Quick reply to this message
Old 07-31-2018, 08:35 AM
Hinckley Bill is online now
Find More Posts by Hinckley Bill
Registered User
Hinckley Bill's Avatar
Hinckley Illinois
Joined Jan 2006
2,182 Posts
Quote:
Originally Posted by tande View Post
Yes, WOW! .......I had NO idea they included an internal filter! .....

There was so much 'chatter' going on regarding felt 'plugging' I felt it best to at least try to get to the bottom of the filter/clunk itself and it's really easy to do with the removable retaining clip
Hinckley Bill is online now Find More Posts by Hinckley Bill
Reply With Quote Quick reply to this message
Old 07-31-2018, 10:13 AM
ghoffman is online now
Find More Posts by ghoffman
Registered User
ghoffman's Avatar
New Hampshire, USA
Joined Nov 2009
8,044 Posts
Maybe this works for a 20cc chainsaw but it looks like a restriction for a 120cc. Maybe they are Ok, but for a 120, it needs about 50cc/minute peak flow. I welcome a gravity flow test.
ghoffman is online now Find More Posts by ghoffman
Reply With Quote Quick reply to this message
Old 07-31-2018, 12:42 PM
orthobird is online now
Find More Posts by orthobird
I hammer at 1500 feet
orthobird's Avatar
United States, LA, Shreveport
Joined Apr 2012
8,202 Posts
Trust me!! It is restricting flow on my 200. I have learned this the hard way. But now I am convinced.
orthobird is online now Find More Posts by orthobird
Reply With Quote Quick reply to this message
Old 07-31-2018, 02:30 PM
torquen is online now
Find More Posts by torquen
Registered User
torquen's Avatar
Lodi, Ca. USA
Joined Jan 2006
1,599 Posts
That’s strange if you are seeing a restriction on your 200. I’ve been running felt clunks in my fuel cans for 20 years. My pump fills my 60 oz tank up in a matter of mins without cavitation.

I recently put in a ceramic filter because I changed out the lines and had it available. I don’t notice the pump working any different.
torquen is online now Find More Posts by torquen
Reply With Quote Quick reply to this message
Old 07-31-2018, 02:39 PM
Cryhavoc38 is offline
Find More Posts by Cryhavoc38
Living the dream
Cryhavoc38's Avatar
United States, WA, Woodinville
Joined Oct 2007
6,508 Posts
Quote:
Originally Posted by torquen View Post
That’s strange if you are seeing a restriction on your 200. I’ve been running felt clunks in my fuel cans for 20 years. My pump fills my 60 oz tank up in a matter of mins without cavitation.

I recently put in a ceramic filter because I changed out the lines and had it available. I don’t notice the pump working any different.
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.
Cryhavoc38 is offline Find More Posts by Cryhavoc38
Reply With Quote Quick reply to this message
Old 07-31-2018, 03:09 PM
ghoffman is online now
Find More Posts by ghoffman
Registered User
ghoffman's Avatar
New Hampshire, USA
Joined Nov 2009
8,044 Posts
A former boss and mentor drilled into me: "One good test is worth 1000 opinions". I hope Doc does the flow test!
ghoffman is online now Find More Posts by ghoffman
Reply With Quote Quick reply to this message
Old 07-31-2018, 05:05 PM
Truckracer is online now
Find More Posts by Truckracer
Registered User
Des Moines, Iowa USA
Joined Nov 2007
4,787 Posts
Quote:
Originally Posted by orthobird View Post
Trust me!! It is restricting flow on my 200. I have learned this the hard way. But now I am convinced.
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.
Truckracer is online now Find More Posts by Truckracer
Reply With Quote Quick reply to this message


Quick Reply
Message:


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools