Re: [COUPERS-TECH] Engine Power loss

[Charlie Reno]

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I had a similar problem of losing partial power when I rotated to lift off.

After several hours of AP time/testing, the main cutoff fuel valve was replaced.

I have the original(in perfect condition) in front of me and just used a screwdriver to repeat some tests.

The handle comes off with removal of a single screw. the hex shaft allows the handle to be put back on 60 or 120 degrees out of phase. Putting the handle on correctly: shut off and no air can be blown through. Both 60 and 120 out of sync reinstallation make it behave such  there is still much air easily blown when in the "off" position OR IN THE ON POSITION. However, the amount of fuel flow is reduced below normal in the "full on" position.

 

I had had to replace my handle several times as it came off in flight!

 

After lift off rotation, there is a bit less "head" between tank and carb! Hence reduced fuel flow and reduced power(RPM).

 

I came back to the field(5300 ft long) and landed down wind by declaring emergency. This was after a cylinder replacement at annual inspection time at local FBO! Then the expense and replacement of valve.

 

Experiment: Run engine at idle, turn main valve full OFF and see if engine still runs. If so, review the history of rotated handle.

Charlie

ps I keep the original valve as a reminder of having learned something!

----- Original Message -----

From: John Steel

To: Tech@ercoupers.com

Sent: Sunday, September 07, 2003 3:48 AM

Subject: [COUPERS-TECH] Engine Power loss

----[Please read http://ercoupers.com/disclaimer.htm before following any advice in this forum.]----

Group,

I have been having a problem recently, and I thought I would get some input from the group. my 1946 415 C/D with C85 and Marvel Carb will loose some engine power shortly after take off, the RPM's will decrease to about 1900 RPM, this does not show up on the ground in the mag check or even in a full static run up on the ground.

when it happens you can turn off the left mag, and then the right mag in the air and there is NO EFFECT. Full carb heat does not help either.

So far I have cleaned the plugs, then replaced the plugs with new ones, Checked for water in the fuel, and there is no water in the fuel.

Strange that this does not show up on the ground. I am getting pretty good at getting it back to the runway, But would rat6her practice this knowing that I have full power if I need it.

Any Ideas ??

John Steel

94115

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