VT80BL Instruction Manual
Page 17
JETS MUNT S.L
Other useful information and installation tips:
Fuel and Oil
1. Use CLEAN well filtered Jet A1 or kerosene fuel which is available from most airports, or
paraffin (K1) used for greenhouses available from most hardware stores.
2. Ensure the fuel is clean and filtered at each stage of mixing and transfer to the model
fuel tank.
Please note the importance of using clean fuel. Failure to do so will result in blockages of
the fine fuel injectors in the engine or blockage of the engine lubrication system and
subsequent bearing damage.
3. Ensure the fuel is free from moisture (water is heavier than fuel and will settle at the
bottom of the container).
4. Use good quality oil:
-> Aircraft turbine oils e.g. Aeroshell 500, Exxon 2380, Mobil JetOil II. Mix at 4%
-> Mobil DTE Light turbine oil. Mix at 5%.
-> 2 stroke 100% synthetic oil with a specification JASO FC or better. Mix at 3%
-> Recommended: 3% Mobil DTE Light + 1% 2T Oil (JASO FC)
DO NOT USE TCW-3 oil. TCW-3 is a specification for marine oils and guarantees that it is
not poisonous for aquatic life, however not guarantee the oil quality for turbojet engine use.
Important note regarding the 2T oil:
The engine can use 2T oil, but the different oil
brands use different contents of additives to protect the mechanical parts from rust
during inactivity periods. This is good for engine protection, but some oils become too sticky
when cold, preventing the starter motor to turn the rotor at correct speed, causing a
startup failure (Bad Starter message) or damage to the ecu or starter motor after
repeated abuse. We strongly recommend to use turbine oil or our recommended oil mix if
you find that the rotor become sticky on cold conditions.
5. The fuel must be mixed with oil in the recommended ratio. Too little oil will shorten the
bearings life. You can use higher content of oil (5-6%) without any problem for the engine to
share the same fuel with other engines.
Please remember to always handle fuel and oils with care! Avoid all direct contact with skin
– in case of contact wash all affected areas with soap and warm water immediately.
Feed Pipes
All the pipes must be Polyurethane or nylon as provided by Jets Munt or Tygon (like the
ones used by gasoline engines). Do not use Tygon on the pressure side of the fuel pump.
Silicone tubing must not be used anywhere in the installation as it is dissolved by fuel and
oil. If in doubt, take a small piece of tube and submerge it in kerosene for a few days and
verify that its characteristics have not changed.
