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RCV 58-CD Mid Range Sputter

Old 08-08-2009, 08:00 AM
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therocket
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Default RCV 58-CD Mid Range Sputter

I have a mid range sputter that seems to be very difficult to eliminate. I don't want to lean out the low or high speed needles too much. Slow to high speed throttle transition seems ok but I feel it could be better. I notice at mid throttle while flying the plane the engine sputter and I want to avoid a dead stick if I can. I noticed that the high speed needle has some side to side play in it and I'm currently running it at 1 turn off of seated. The low speed needle is screwed in 4 1/2 - 5 turns from fully screwed out. This is where the engine seems to run ok at this time. If I put some side pressure etc on the HS needle I notice a change in RPM. I'm running O'Donnell 10% Airplane fuel and have at least 10 tanks thru the engine. Any help is appreciated.
Old 08-08-2009, 02:04 PM
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mboland
 
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Default RE: RCV 58-CD Mid Range Sputter

The position of the idle seems a tad rich.
This can make a lot of difference in trying for a good tune.
How did you arrive at the idle setting you are using?
Old 08-09-2009, 10:49 AM
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therocket
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Default RE: RCV 58-CD Mid Range Sputter

For the current LS needle position...this seems to be where the engine runs decent with the throttle at about mid point.
Old 08-09-2009, 03:23 PM
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mboland
 
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Default RE: RCV 58-CD Mid Range Sputter

The trouble there is that the main needle also has an influence on that setting, so you can end up out of whack (technical term) over the whole range.

When in doubt, reset the needles.
Close the main needle then wind it out 1 1/2 turns.
Close the throttle so you can JUST get a fine pin into the barrel opening (<1mm)
Connect silicone tubing to the carb fuel nipple and blow through it.
You should be able to detect a SLIGHT leakage of air.

This is a good starting point.

Start the motor, and while running WOT, adjust you main needle for max rpm then richen SLIGHTLY.
Take it back to idle and adjust idle needle for max rpm at idle then richen SLIGHTLY.

That should do it.

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