 24th January 2004
|
The engine was started and run for just under two minutes. During this period
the engine temperature would rise from room temperature to approximately 100degrees Celsius at which point the engine was shut down. Data from the EIS and
the oscilloscope were recorded. This video indicates the condition
for the test run. Notice that these runs were conducted in extremely cold
weather typically -20 degrees Celsius. |
|
Engine & Propeller RPM
The following chart indicates the rpm as a function of time. The RPM was
intentionally brought up slowly to ensure reliable data at the EIS. After
30 seconds the throttle was advanced to yield a MAP of 30 inches. As indicated
by the chart there was considerable fluctuation in engine speed. Audio/Video recording
using a digital camera also provided audio evidence for this fluctuation. As the
throttle was advanced the power increased until the engine reached 4000 rpm. As
the throttle was advanced further the RPM reduced and the there was a noticeable
fluctuation in power during the course of the test.
Manifold Absolute Pressure (MAP)
The MAP is indicated in the chart below. Maximum RPM occurred at 47 seconds
but at this engine speed the MAP was 26 inches. Strangely enough, the engine
speed reduced as the MAP increased beyond this point. The "check engine"
light had come on during this test run indicating error code 33 which is an
erroneous signal from the speed sensor. Since the speed sensor input had been
left open in the belief that it was unnecessary I concluded that this was the
reason why this strange characteristic existed. The engine had turned to a "limp
home" mode with a power around 175hp.
|
