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Old 07-29-2018, 06:41 AM
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I’m not against them, but I filter in and out but run a PSP clunk to carb unrestricted.
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Old 07-29-2018, 08:51 AM
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They're get'n lower mate.....
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The Tilitson "pelt" clunk's don't release fibers - different material to the walbro felt clunks
The Tilitson uses a "pelt" material not felt , the pelt material is a tighter natural fiber
The alloy cast carrier is also cleaned up by opening up (drilling) the center hole , the casting process leaves a part line down inside in the fuel nipple and a chance of restriction or piece break-away
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Old 07-29-2018, 11:34 AM
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In thrust we trust!
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This is a standard Husqvarna chain saw fuel clunk/filter. I have been using solely these for over a decade. Less flow resistance than felt clunk. Sips fuel even if only a part of it touches the fuel. The largest engines using this at our field are ZDZ-224, DA-200 and Moki 250.

--kaboomski;
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Old 07-29-2018, 01:15 PM
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Yep, ceramic is the ticket
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Old 07-29-2018, 02:40 PM
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I hammer at 1500 feet
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I tried the ceramic, It had way more increased resistance to fuel flow than the felt. It was a quite shocking. Night to day difference. And, dumb dumb me did not figure it out til later that it was the ceramic filter taking the engine out of tune (lean).
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Old 07-29-2018, 02:49 PM
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Put Scale Back Into Aerobatics
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Quote:
Originally Posted by orthobird View Post
I tried the ceramic, It had way more increased resistance to fuel flow than the felt. It was a quite shocking. Night to day difference. And, dumb dumb me did not figure it out til later that it was the ceramic filter taking the engine out of tune (lean).

Interesting......we use ceramic on all our planes, with great success....in fact, Viton and ceramic clunk is all we use.
In fact, I even the resistance on this filter by pumping smoke oil (much thicker than gas) through it: the pump did not even slow down.
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Old 07-30-2018, 05:55 AM
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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.
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Old 07-30-2018, 06:02 AM
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I hammer at 1500 feet
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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.
Good idea, I will try that!
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Old 07-30-2018, 06:51 AM
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Doctor, I am certain you can find a suitable hemostat to clamp the fuel line...
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Old 07-30-2018, 07:06 AM
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but for that he would need a nurse
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Old 07-30-2018, 12:24 PM
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When should Viton be used over traditional lines?
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Old 07-30-2018, 12:32 PM
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I hammer at 1500 feet
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Use Viton inside the tank. It will not harden or decay over time.

I say three to 4 years.

Tygon hardens after 1 season

Never use Duprene rubber for a fuel line, they crack over time
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Old 07-30-2018, 12:32 PM
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When should Viton be used over traditional lines?
Always. Only downside is it is opaque.
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Old 07-30-2018, 12:39 PM
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Quote:
Originally Posted by orthobird View Post
Use Viton inside the tank. It will not harden or decay over time.

I say three to 4 years.

Tygon hardens after 1 season

Never use Duprene rubber for a fuel line, they crack over time
Quote:
Originally Posted by ghoffman View Post
Always. Only downside is it is opaque.
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?
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Old 07-30-2018, 12:43 PM
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Living the dream
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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?

All my non viton external lines are still pliable after years of service.
Not sure there is a viable reason to use Viton everywhere but its an individual choice of course.

Since I replace clunks every year, I still use good ol Stihl or Oregon Tygon in the tank. Keeps me from becoming complacent about replacing the felt clunks each season.
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