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#1
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Does Lycoming make any sense?
I just spoke with Lycoming regarding my very high fuel flow. Recently
I've had a problem where I'm getting almost double my normal fuel flow at idle even with the mixture at the edge of cut-off. I suspected a servo but called Lycoming. They said I may have a nozzel with a blockage and the other nozzles are streaming because of it. Does this make any sense? Could a blockage cause an *INCREASE* in fuel flow? I have a JPI fuel transducor wheel that measures fuel flow that has shown to be very accurate. -Robert |
#2
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Does Lycoming make any sense?
I'd do a flow test then clean all injectors and do another flow test. Just
have some help and extinguishers around as already mentioned. Get your hands on 4 baby food jars with lids. Poke 3 holes in each lid, center large hole for the injector nozzle, 2 outside holes for a piece of stiff wire to fashion into a hanger. (and to vent air) Weigh each empty set up, record empty weights. Insert nozzles into center holes, screw jar onto cover. Run boost pump after your helpers have been awakened and armed with extinguishers. Weigh each jar, compare net fuel weights. Clean, lather, rinse, repeat. Jim |
#3
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Does Lycoming make any sense?
Sounds like they didn't understand that you are observing the high fuel flow
on an in-line true flowmeter rather than their pressure-based panel meter. "Robert M. Gary" wrote in message ps.com... I just spoke with Lycoming regarding my very high fuel flow. Recently I've had a problem where I'm getting almost double my normal fuel flow at idle even with the mixture at the edge of cut-off. I suspected a servo but called Lycoming. They said I may have a nozzel with a blockage and the other nozzles are streaming because of it. Does this make any sense? Could a blockage cause an *INCREASE* in fuel flow? I have a JPI fuel transducor wheel that measures fuel flow that has shown to be very accurate. -Robert |
#4
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Does Lycoming make any sense?
Stan Prevost wrote: Sounds like they didn't understand that you are observing the high fuel flow on an in-line true flowmeter rather than their pressure-based panel meter. That's what I thought but I reenforced what I was saying several times. I really just don't want to send a 600 hr fuel servo for O/H for $2K if it doesn't need it. -Robert |
#5
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Does Lycoming make any sense?
Robert M. Gary wrote:
I just spoke with Lycoming regarding my very high fuel flow. Recently I've had a problem where I'm getting almost double my normal fuel flow at idle even with the mixture at the edge of cut-off. I suspected a servo but called Lycoming. They said I may have a nozzel with a blockage and the other nozzles are streaming because of it. Does this make any sense? Could a blockage cause an *INCREASE* in fuel flow? I remember discussing this when working on my A&P, and promptly forgot about it after I got out of school. IIRC, it has something to do with the fuel injection...if one is blocked, the other nozzles pick up the loss and are sometimes too efficent. Obviously I can't remember the exact cause, but I've heard the same exact thing before...blockage can cause an increase in fuel flow. |
#6
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Does Lycoming make any sense?
Why don't you just have the nozzles cleaned and rule that out?
Robert M. Gary wrote: Stan Prevost wrote: Sounds like they didn't understand that you are observing the high fuel flow on an in-line true flowmeter rather than their pressure-based panel meter. That's what I thought but I reenforced what I was saying several times. I really just don't want to send a 600 hr fuel servo for O/H for $2K if it doesn't need it. -Robert |
#7
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Does Lycoming make any sense?
This is just at idle?
Are your manifold pressure and rpm readings in line with each other? I am thinking about cam shaft wear. John Robert M. Gary wrote: I just spoke with Lycoming regarding my very high fuel flow. Recently I've had a problem where I'm getting almost double my normal fuel flow at idle even with the mixture at the edge of cut-off. I suspected a servo but called Lycoming. They said I may have a nozzel with a blockage and the other nozzles are streaming because of it. Does this make any sense? Could a blockage cause an *INCREASE* in fuel flow? I have a JPI fuel transducor wheel that measures fuel flow that has shown to be very accurate. -Robert |
#8
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Does Lycoming make any sense?
If I remember my "mechanical fuel injection 101" there is a "relief
port" of sorts somewhere. The pump delivers enough for the injectors and then some. The "relief port" orifice bleeds off the excess and returns it to the tank or the input side of the pump. Different size ports changes the fuel delivery for different size engines. If it gets clogged I would think the pump would deliver way too much fuel. Your system, however, may not be like that. Just a guess. Jim On Oct 20, 4:58 pm, "Robert M. Gary" wrote: I just spoke with Lycoming regarding my very high fuel flow. Recently I've had a problem where I'm getting almost double my normal fuel flow at idle even with the mixture at the edge of cut-off. I suspected a servo but called Lycoming. They said I may have a nozzel with a blockage and the other nozzles are streaming because of it. Does this make any sense? Could a blockage cause an *INCREASE* in fuel flow? I have a JPI fuel transducor wheel that measures fuel flow that has shown to be very accurate. -Robert |
#9
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Does Lycoming make any sense?
The Visitor wrote: This is just at idle? Are your manifold pressure and rpm readings in line with each other? I am thinking about cam shaft wear. Anytime. However, it is a little bit intermitent. Sometimes it "clears" itself. I can't increase throttle w/o increasing mixture but I *MUST* keep the two perfectly in line, if either gets in front of the other the engine dies. It really feels like there is no fuel regulation. -Robert |
#10
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Does Lycoming make any sense?
Robert M. Gary wrote:
The Visitor wrote: This is just at idle? Are your manifold pressure and rpm readings in line with each other? I am thinking about cam shaft wear. Anytime. However, it is a little bit intermitent. Sometimes it "clears" itself. Probably the blockage in a fuel nozzle moving around. |
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