Detonation
INCORRECT TYPE OF FUEL :
Using fuel with an inferior octane ratio (wrong fuel or old/badly stored fuel) can lead to
detonation.
Temperatures inside the cylinder heads rise quickly with a total engine failure as result.
Please read the latest engine manual/SB to know about the minimum octane ratio that is required for your engine.
MIXTURE TOO LEAN:
Your ULPower engine is an injection engine. Due to continuous and copious amounts` of fresh fuel (+/-
120liters/hour) pumped through across the fuel rail, there is no risk of vapor lock or icing . However, if air is sucked by the fuel
pump, it will lead to a lean mixture and higher temperatures and risk of detonation. How to prevent air suction ?
•
Make sure the suction line to the fuel pump can never (whatever attitude your plane is in) suck air from the fuel tanks.
•
Make sure fuel tank pickups cannot unport
•
Use a fuel header tank where appropriate
•
See
here for more details
on air entering the system
INLET AIR TEMPERATURE TOO HIGH:
If the inlet air temperature is too high (max inlet air temperature = ambient air
tempe 10 °C), you not only lose a lot of power but the
cylinder head temperature
and the
oil temperature
rise. As a
result of this, the detonation risk rises.
•
Consider bringing fresh air from outside the cowling, for example using a NACA duct and the ULP air inlet box (K0600001 /
K0600002), and scat hose for the filter to fit inside to bring fresh, cooler air to the engine.
