your engine to the best technology available today --
And Here's Why:
is best technology available, there’s
nothing else like it, nothing even comes close.
Operation lean of
peak requires special information that only the
G3 or G4 Graphic Engine Monitor can provide.
The G Series instruments are
extraordinarily capable yet easy to use.
specialized innovative leaning process is the
first and only one to ever earn a patent.
its sophistication, most importantly it makes a
complex process easy to accomplish.
reference to temperature only is just too
confusing for LOP.
process reports each individual cylinders status
in unambiguous form.
You needn’t ponder
if a cylinder is rich or lean we display that
uniformity is paramount to operation lean of
peak but only Insight delivers a nozzle analysis
every time you lean.
G Series can forewarn of problems and
assure uniformity of results. Of course other
systems just leave you in the dark.
G Series Data:
instruments are not just temperature indicators,
they compute real-time results using manifold
pressure, RPM, fuel flow and temperatures.
G Series handles
the raw data to eliminate confusion and provide
answers. It couldn’t be easier.
displaying critical information during flight
the G Series always work diligently behind the
scenes too, logging data to a handy SD card for
study later so nothing is missed.
It’s easy to go
back in time, study trends and trace problems to
Decades ago Insight
introduced the first instrument to display
cylinder and exhaust gas temperature of all
eventually became the industry standard as all
other manufacturers followed suit.
depend on numerous temperature probes that have
equal potential to inform or confuse when any of
In fact probe
failures can easily be confused with engine
Only the G Series
has a probe diagnostic system built in.
If injected you should take your plane up
and try a 50 degree lean of peak to see how your
injectors are and here is how to do it with a G2, G3
You will know the order of the lean, temperature
spread and fuel spread.
You should be under .5 gallons from first to last to
All of this will be on your G Series screen
Order of lean is boxes appearing as they hit
Temperature distance from peak is the number in the lean box
Fuel Spread is on the EGT columns after EGT
Set Bar Height and Lean Threshold
First push of SEL knob you can adjust EGT bar height
on G2-G3-G4 Single and G4 Twin.
Turn SEL knob to adjust height (This should be
preset at Insight)
If you have to adjust the bar height every time you
have a bad probe (Check probe page)
- Second push of SEL knob you can adjust the lean
threshold (rich or lean) on G2-G3-G4 Single and G4
Turn SEL knob to adjust threshold (Set to 50) Then
If one injector's fuel
flow is higher and still won't freeze on EGT bar
after all the other have this could mean a dirty
The spray pattern at the nozzle is determined by
the hole shape, size, fuel pressure, and the
amount of ambient or deck pressure air mixed at
A good spray pattern will
provide maximum atomization and smooth,
consistent engine operation.
a nozzle with a dirty shroud or deteriorated
upper deck shroud seals will not provide the
same spray pattern as a clean unit.
Likewise, if the calibrated orifice has become
damaged due to rough handling or if the inside
diameter of the orifice has been scratched or
chipped by insertion of safety wire or some
other equally offensive material, the spray
pattern will never be right — despite the
cleanliness of the screen or the condition of
the shroud seals.
Here are some Continental charts
showing injector fuel spread
A very crucial function is needed for "Running
Lean Of Peak" is
Insight's exhaust valve analysis in-flight.
"Not on the ground after the
damage is done"
Function is a standard patented
feature on all G3, G4 and G9 engine
is a new form of engine analysis.
Some valve related engine faults produce a slow periodic
variation in EGT.
The oscillation rate is on the order of one cycle every minute
or two. This is just too slow to be identified by occasional
observation of the temperatures alone. Yet it is very important
to discover this phenomenon because it may lead to a
catastrophic engine failure. It readily appears in a slow
sampled spectrum analysis.
Temperature samples are collected once per second for each
cylinder and analyzed each second. The entire sample interval is
about 8 minutes. A normal indication will be a flat line with a
little noise, while a trouble indication will show as an obvious
Use this page after you lean the aircraft -
IMPORTANT - If you see a recurring spike on
one of the cylinders you can turn the SEL knob to
see which cylinder it is.
You might want to pull that and a good cylinder plug
compare and bore scope effected cylinder to see how
the exhaust valve looks and compare to good
Here is a animated short to see the LOP
As each cylinder hits peak the fuel flow freezes on the
On the animated image above cylinder 4 is first to hit
peak with a fuel flow of 15.5 gallons
On the animated image above cylinder 3 and 5 peaked with
a fuel flow of 15.2 gallons
So 15.5 gallons minus 15.2 means the Gami spread here is