In a message dated 3/2/2005 9:48:47 A.M. Central Standard Time, Sky2high
writes:
I have not monitored the fuel flow gauge carefully during this
phase. It is about 1.5 GPH at 1000-1100 RPM. If I spend the time,
I do see a rise of 20-30 RPM if I lean to "peak" RPM.
Stuttering - something's wrong. I am operating with an electronic
ignition (LASAR), fine wire plugs gapped more open than normal, .022
shrouded injectors that deliver cruise EGT peaks within .3 - .5 GPH (GAMI
Lean Test) and other adjustments. Thus, I believe I have achieved
a reasonable balance of the required 3 S's - Spark, SFuel and SAir -
throughout all normal engine operation.
I will try to get the FF info today (weather permitting - it's freaking
cold here) as best I can as reported by the VM EPI800 engine
monitor.
Robert,
OK, it wasn't that cold today, the sun was shining and turbulence stopped
at 4000 MSL.
Here is my info:
Baro 30.1, 700 MSL, OAT -1C, aircraft pointed into 12 Kt wind.
Engine start and oil below 95F:
900 RPM, 1.3 GPH (full rich), then leaned to RPM 930-940 and FF was
1.1
Engine warm and oil at 95F:
1000 RPM, 1.5 GPH, then leaned to RPM 1030 and FF was 1.3
Engine warmer:
1200 RPM, 1.8 GPH, then leaned to 1220 RPM and FF was 1.5 GPH
910 RPM, 1.3 GPH, then leaned to 930 RPM and FF was 1.1 to 1.0 GPH
More interesting after flight, practice GPS 33 appr, turn off runway and,
whilst taxiing:
900 RPM, 2.4 GPH - this would not change, even though I leaned it, until
about 2 minutes passed - note that wind was at my back on taxi in.
Was this due to hot engine and vaporization at idle? ??
Finally,
900 RPM, 1.2 GPH, then leaned to 920 RPM, 1.1 GPH
After 1 mile taxi, I turned into the wind and stopped:
900 RPM, 1.1 GPH, then leaned to 920 RPM, 1.0 GPH
Boost pump on and the same results were repeated.
At 800-900 RPM, engine burbled (stuttered?) regardless of lean.
Oh well, the Corvette 8-cyl did the same stopped in the driveway after 40
minutes of 75 mph on the tollway AND, it is controlled by a FADEC......
Scott Krueger
AKA Grayhawk
Lancair N92EX IO320 SB 89/96
Aurora, IL (KARR)
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