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HelicopterGasser Model RC HelicoptersOther › Stens clunk failed after 230 flights
01-28-2007 01:13 AM  10 years agoPost 1
rbort

rrProfessor

Franklin, MA - USA

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Was flying my Spectra-G this afternoon after some ice skating earlier and after 1 good flight the engine started starving and dying. I had to auto it in unexpectedly and after some fiddling I realized the clunk was blocked. I went home and took it out, its really hard to draw fuel through it. I've replaced it with the original gasser clunk that I used for several years paired with a filter.

Just an informative note to keep that in mind in case run into similar issues. I'm not sure why this thing has gotten blocked or really hard to draw fuel though. I also think the cold doesn't help (maybe the oil thickens and makes it harder to draw it) but in any case I replaced it as I need to fly in the cold too!

-=>Raja.

MA 1005 Hanson 280, 4142 flts
Spectra 27 3DMax, 3210 flts
Whiplash V1 Hanson 300, 1440 flts
Whiplash V2 Hanson 300, 207 flts

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01-28-2007 12:40 PM  10 years agoPost 2
BIGRCR

rrVeteran

Easley, South Carolina

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The Stens is a filter and as it filters out crap (it's job), it plugs up with the stuff it filters out and becomes plugged. This will happen more frequently if you use dirty fuel or gasoline.

Later,

BIGRCR- John Garst

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01-28-2007 02:06 PM  10 years agoPost 3
rbort

rrProfessor

Franklin, MA - USA

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Hmmm...

I did try to force fuel backwards through it to flush it but to no avail. It does bleed out fuel but its very hard to move fuel through it. I thought it was a "stone" as crap just didn't enter it period. It almost seems like its pores got blocked with fuel/oil material not crap really as anything larger than the pores should just stay in the tank.

I've switched to a standard clunk for now with a filter as I did for years before this thing was even known about. Will see how that works and fuel flow is ALOT easier with that. I may have to tweak the needles a little to account for that. Since I don't use the entire tank in a flight (about 3/4 only), I think it should work just as well.

-=>Raja.

MA 1005 Hanson 280, 4142 flts
Spectra 27 3DMax, 3210 flts
Whiplash V1 Hanson 300, 1440 flts
Whiplash V2 Hanson 300, 207 flts

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01-28-2007 03:13 PM  10 years agoPost 4
Billme

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MS

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I wish they still made the ceramic type...I guess its possible the extreme cold as where you live could possibly effect the compound they use now... After all, they are made for weed-eaters engines, and they do there job in the summer..
If this is the case, they make others with a fabric type that cold will not effect...
I will put a new one in the freezer over nite, and do a test..
Bill

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01-29-2007 04:16 AM  10 years agoPost 5
rbort

rrProfessor

Franklin, MA - USA

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Regular clunk not as good.

Well the regular clunk is going up in the air when I dive and after 8 minutes the motor is starting to lean out as I'm getting air in the gas line. I flew 4 short flights today to log 2 only using the top 1/4 of the tank. I need to do something else.

I was talking about the felt clunk today at the field with the guys but now I wonder if it will fit into the tank opening. Another thought came to mind is that maybe I can boil the original clunk in antifreeze and maybe that will clean it up? Who knows...anyway, to make a long story short with my setup I need either a replacement stens clunk or one of the felt ones if I can get it to go into the tank.

-=>Raja.

MA 1005 Hanson 280, 4142 flts
Spectra 27 3DMax, 3210 flts
Whiplash V1 Hanson 300, 1440 flts
Whiplash V2 Hanson 300, 207 flts

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01-29-2007 05:58 AM  10 years agoPost 6
Stet

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Key Largo FL

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The stens is a plastic element, not ceramic, right? I always heard it to be ceramic, but found mine to be flexible

The lead and felt clunk is the best I have found, but you will definately want an inline screen filter to keep the fibers out

keepin' it real

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01-29-2007 04:50 PM  10 years agoPost 7
scotter

rrApprentice

Winston-Salem, NC

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Stens

I'm pretty sure the Stens is a sintered plastic element. This is just from personal observation. It's not near heavy enough to be ceramic. Additionally, it is clearly a molded item, and the surface finish sure leads one to plastic and not ceramic (usually much rougher). But anyway, at the low cost of these things, why not just replace it rather than trying to clean it? IIRC, they're only like $4 or $5, and I remember some people saying they found them in their local hardware store in the mower section.
If I'm right and the element is plastic (again, I'm pretty sure), then you stand a good chance of destroying it by cleaning. You might find taht boiling it in antifreeze might soften or even collapse the material. I have (unfortunately) destroyed some plastic parts while cleaning engine components in the a/f pot. When I say destroyed, I mean they were completely gone!

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01-29-2007 05:51 PM  10 years agoPost 8
AceBird

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Utica, NY USA

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Well the regular clunk is going up in the air when I dive and after 8 minutes the motor is starting to lean out as I'm getting air in the gas line.
Don’t forget your tubing is less flexible in the cold. You may have to add weight to the clunk. Are you using the same mixed fuel that you had in the summer? If you are it doesn’t have the additives in the gasoline for the winter months. The same could be true for the oil. If you want to fly in the cold you may have to switch to snow mobile oil so it doesn’t congeal.

The Sterns is great for a weed eater where it is easy to get grass and leaves in the tank. If you filter your fuel before you put it in the tank do you really need it?

Winter flying is also going to mean needle adjustments. You should record exactly where they are now so you can put them back in the summer. Any fuel you have left over I would burn up in the lawn mower.

Ace
What could be more fun?

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01-30-2007 03:17 AM  10 years agoPost 9
Billme

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MS

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The primary purpose of the Stens is to keep air away from the carb, otherwise you will find out when you do a roll or a loop...
It filters the fuel pretty good too....
Bill

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01-30-2007 03:32 AM  10 years agoPost 10
rbort

rrProfessor

Franklin, MA - USA

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I'm getting a different kind

Bill:

Today I was looking around on the stens website and I'd like to try something else as apparently this one fails. I have a felt clunk in my 1/3 scale Carden Extra 300 for 10 years now and that has never been an issue.

I spoke with a local guy "Boston Lawn Mower Company" and the 615-912 walbro felt filter measures to be about the same diameter (or a little smaller) than the original ceramic clunk that I have so it will fit inside the dubro tank opening. Here is a link:

http://www.stens.com/dealernet/cata...e=3&part=615912

Have you ever tried this one? I'm thinking to give it a go and see if it behaves as well in my heli as it does in my airplane. Also, this one is non-blockable unlike the ceramic one in my opinion...

-=>Raja.

MA 1005 Hanson 280, 4142 flts
Spectra 27 3DMax, 3210 flts
Whiplash V1 Hanson 300, 1440 flts
Whiplash V2 Hanson 300, 207 flts

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01-30-2007 03:33 AM  10 years agoPost 11
AGRAV8

rrProfessor

Mosquito Coast......Houston Texas

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yep

Stens in all my gassers, and I don't forsee going to anything else. Raja, get a new one. Besides, it is STILL cheaper than a glow plug.... remember those???

GOOD guy list-39, BAD guy list-0

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01-30-2007 04:22 PM  10 years agoPost 12
Disciple4123

rrKey Veteran

USA

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I've been running the fabric one that came with the G230RC, no issues with it. I thought it would relaease cotton and all that, but no problems. Daves motors probably sells them, made by Walbro.

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01-30-2007 05:46 PM  10 years agoPost 13
AceBird

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Utica, NY USA

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The primary purpose of the Stens is to keep air away from the carb, otherwise you will find out when you do a roll or a loop...
Yes Bill that is true but I have done loops and rolls with an airplane that you can’t possibly match with a helicopter and never missed a beat. The Stens does one other thing that really is what makes it affective. It adds weight to the clunk. If you add weight to a standard clunk you won’t suck air on a loop or a roll, especially with a heli.
this one is non-blockable unlike the ceramic one in my opinion...
I don’t think so Raja, all filters are blockable. That’s how they work. The finer the filtration the easier they are to block. In order for the Stens clunk to have capillary action it must have very fine pores. The felt could be a prefilter with another element underneath. This is very common for a filter system because the coarse filter protects the fine filter.

We use bacteria filters (along with several prefilters) on our water system. They lasts anywhere between 1 hour to two months depending on the water supply.

ALL filters block and ALL fluids have contaminates. You only need to filter down to a size that is slightly smaller then the smallest orifice in the carb. After that you are asking for unnecessary problems.

When you pull up to the pump to fill your car the fuel is filtered before it goes into the tank. Many cars today don’t have inline filters anymore. In the old days when the tank started to rust it would clog the inline filter. You changed the filter and how long would it last? Changing the filter didn’t solve the problem.

Ace
What could be more fun?

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01-30-2007 06:34 PM  10 years agoPost 14
scotter

rrApprentice

Winston-Salem, NC

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When you pull up to the pump to fill your car the fuel is filtered before it goes into the tank. Many cars today don’t have inline filters anymore.
What?!?!? Name one!
No car manufacturer in their right mind would omit such a thing, especially since fuel injection became commonplace. Many vehicles have an in-tank filter and another in the engine compartment prior to the fuel rail.

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01-30-2007 06:46 PM  10 years agoPost 15
Flying Tivo

rrKey Veteran

Monterrey,NL,Mexico

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jeep cherokee 99

Does not have an inline fuel filter. It has a mesh at the fuel tank and it has not been change since factory. 8 years and going strong.
I think as long as the particles on the fuel are not larger than the fuel inyection spray nozzle it will be fine.

Felipe

If life throws at you lemons......Squirt some lemon juice in the eye of your enemy!!!!

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01-30-2007 09:49 PM  10 years agoPost 16
AceBird

rrElite Veteran

Utica, NY USA

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I think as long as the particles on the fuel are not larger than the fuel inyection spray nozzle it will be fine.
Same is true for the carburetor.

I have a 2001 Dodge Dakota. I had two injectors plug up no further than 10 miles from where I pumped in the gas in PA.

Filters affect the mixture ratio which affects emissions. EPA doesn't like that. Dealerships don't mind cleaning injectors for a hundred or so.

Ace
What could be more fun?

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02-03-2007 08:49 PM  10 years agoPost 17
rbort

rrProfessor

Franklin, MA - USA

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1005 clunk failed today also

Now I think its the oil in the cold with this clunk, as that is the only difference from last winter...I posted a new thread about this.

-=>Raja.

MA 1005 Hanson 280, 4142 flts
Spectra 27 3DMax, 3210 flts
Whiplash V1 Hanson 300, 1440 flts
Whiplash V2 Hanson 300, 207 flts

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