Why is my OS FSR going Deadstick?  
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All Forums >> Glow Engines, Gas Engines, Fuel & Mfg Support Forums >> Glow Engines >> Why is my OS FSR going Deadstick?
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Why is my OS FSR going Deadstick? - 4/15/2002 6:51:33 AM   
dyerstown


 

Posts: 83
Joined: 12/11/2001
From: Doylestown, PA,
Status: offline 		My OS .40 FSR recently decided to deadstick most every flight. It has many dozens of great flights on it, and last week it started stuttering at midrange and often went deadstick trying to go from half to full throttle. I disassembled and cleaned carb. Inspected o-rings and did not replace ones on low or high speed needles, cause they looked fine under magnifying glass. Adjusted high speed to point where pinch test did not give increased RPMs, then backed off several clicks. Adjusting low speed so that little or no hesitation when idled for 15 seconds then quickly advanced throttle to full. Tried slightly richer and leaner low speed with same deadstick result. Tried slightly richer high speed that barely made it off runway. Low speed needle seems real sensitive. Plane is Fazer with Mac's muffled tuned pipe. Same combination I've been flying for over a year without this problem. Same 10% Red Max fuel brand it's been happy with forever. Changed plugs--no help. Any suggestions? I'm stumped. Thanks much.
       Post #: 1

OS .40 FSR - 4/15/2002 8:41:49 AM   
Bone



Posts: 332
Joined: 3/15/2002
From: GraftonNSW, AUSTRALIA
Status: offline 		Have you tried bench running the engine ??

Bench running will allow you to test run engine on a different tank, fuel lines etc & also observe at much closer hand any physical symptoms ie: fuel spitting out of carb, needle valve vibrating etc.

(in reply to dyerstown)
       Post #: 2

engine flameout - 4/15/2002 10:02:44 AM   
PeterH


 

Posts: 91
Joined: 1/7/2002
From: granby, CT,
Status: offline 		Might be a good idea when you do engine testing in the airplane to do it with half a tank of fuel, or less. The fuel 'head' is different depending on how much is aboard, and all these fuel systems are the crudest gravity-feed systems since the Model T Ford. You mentioned backing off the mixture a 'few clicks'. You might need even more than that so that the engine will continue to run as the tank gets down.

Another component of the discussion is engine wear. Worn engines don't produce as much combustion heat as those that are unworn. A byproduct of this is needle-valve sensitivity as the engine loses its ability to function at lower temperatures. An OS FSR is a lovely engine, but has this one seen a lot of use?

Good luck with this. Flameouts drive me nuts, too.

_____________________________

Peter Havriluk

(in reply to dyerstown)
       Post #: 3

Why is my OS FSR going Deadstick? - 4/15/2002 6:22:37 PM   
dyerstown


 

Posts: 83
Joined: 12/11/2001
From: Doylestown, PA,
Status: offline 		Thank you for your replies. I certainly will bench test it this week. I will try different tank, same and different tuned pipe, etc. Will also try 1/2 tank of fuel. Engine has lots of time on it. Doesn't feel like much compression, but has lots of power. I have a new ring I can install. (Do I need to hone or scratch cylinder before installing ring?)

(in reply to dyerstown)
       Post #: 4

Why is my OS FSR going Deadstick? - 4/15/2002 8:21:19 PM   
djlyon



Posts: 1986
Joined: 12/10/2001
From: Castaic, CA, USA
Status: offline 		hopefully you have tried a OS#8 plug. If you haven't you might be surprised.

_____________________________

I never met an engine I didn't like.
Of the things I've lost I miss my mind the most.

(in reply to dyerstown)
       Post #: 5

Why is my OS FSR going Deadstick? - 4/16/2002 3:20:25 AM   
THE TAILBACKER


 

Posts: 139
Joined: 3/2/2002
From: New Mexico
Status: offline 		Sounds like your looking in the right direction. Try this out.

1. Air leaks in the fuel tank? A leak somewhere can cause it to get really lean in the air, overheat and then quit. This does not take long, Maybe 1 -2 minutes at most.

2. Next time it happens feel the head (carefully), see if it is extremely hot.

3. Moving parts in the carb can wear out and draw air. If you have a friend or a spare carb. throw it on to check it out.


_____________________________

Retired Army Aviator
AMA#681130

(in reply to dyerstown)
       Post #: 6

Why is my OS FSR going Deadstick? - 4/18/2002 7:11:37 AM   
dyerstown


 

Posts: 83
Joined: 12/11/2001
From: Doylestown, PA,
Status: offline 		Well, it wasn't fuel tank or tubing. Replaced all that and same symptoms. Richened high speed 3 clicks, then 4 more next flight. Same thing. Head seems hot, but probably no hotter than other engine I was running today. Carb is next swap. BTW am using OS #8 plug. Thanks, all!!!

(in reply to dyerstown)
       Post #: 7

Why is my OS FSR going Deadstick? - 4/18/2002 7:36:45 AM   
THE TAILBACKER


 

Posts: 139
Joined: 3/2/2002
From: New Mexico
Status: offline 		How about some crap down in the high end needle hole. Iv'e had that happen. Looks a bit like cotton. I took off the carb and removed the hogh end. Then plugged the bottom with my finger and blew throught the top and that wad came flying out the high end side.


_____________________________

Retired Army Aviator
AMA#681130

(in reply to dyerstown)
       Post #: 8

Why is my OS FSR going Deadstick? - 4/18/2002 6:01:27 PM   
sgilkey


 

Posts: 149
Joined: 2/27/2002
From: Shelby Township, MI, USA
Status: offline 		try removing the needle valve assembly from the carb- the whole NVA screws out of the carb body with a (i think) 7mm wrench, might be 8mm. inside that cavity is the orifice that the HS needle enters- i have frequently found little slivers of silicone fuel tubing or some other debris in there- it moves around and changes the mixture, and will give you fits trying to figure out why your engine is running poorly. give it a try! also, have found little slivers of tubing or plastic in the fuel tank that alternately block or float free of the clunk inlet- give the same symptoms. after cleaning out the carb NVA, if you still have the problem, try swapping a known good tank.

(in reply to dyerstown)
       Post #: 9

Why is my OS FSR going Deadstick? - 4/20/2002 10:09:17 PM   
paul246


 

Posts: 15
Joined: 2/12/2002
From: Moose Jaw, SK, CANADA
Status: offline 		Try removing the HS needle completly along with the fuel line from the carb nipple. Hook up your fuel can directly to the carb nipple and give a few pumps to flush everything out. Reconnect everything and make sure the engine is cleared (from flooding) before restarting.

(in reply to dyerstown)
       Post #: 10

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