Once the synchronization of the throttle cables and idle screws, you should check the maximum
throttle opening (TO BE DONE WITH THE ENGINE OFF!), making sure that they open fully
and simultaneously.
If you followed the above procedure the result will be an engine without any starting problem and
with a regular minimum rev and very stable.
Carburetion tests with maximum rpm on ground and rpm cruising: color spark plugs comparison
and EGT check. How to proceed:
After having anchored the aircraft correctly, warm up the engine, accelerate to full speed
5700/5800 for 15-20 seconds, check the EGT instrument, simultaneously turn off the engine and
remove the gas.
Remove the spark plugs of the exhaust side: if the color is light brown, the temperature is about
600°C. If the color is dark brown, the temperature is about 500°C.
If necessary, change the main jet up to get an EGT temperature at 520/540°C.
Repeat the same procedure to run the engine at cruising for 15/20seconds at 4800/5200RPM
(depending on the type of installation). Check the EGT temperature, turn off the engine and at the
same time removing the gas.
Remove again the spark plugs of the exhaust side. Surely, the color will be lighter than the previous
reading. Then increase the needle jet size to get an EGT temperature of 520/540°C (this
temperature is lower than the recommended one because while cruising there is an increase of
about 20/30°C, given the greater flow of air to the carburetors)
We suggest you to use a 3-bladed propeller Kiev by 182cm with pitch 1.3, already tested by us.
Attention: this is an indicative measure as it depends on the engine and aircraft type. Remind the
runs range: on ground 5700 / 5800 rpm, while in flight 6100 / 6200rpm.
To Next Page
Loading...
Need help?
General
