Crafting N112DR
Well Known Member
Please enjoy my first engine run on my RV-12iS (N112DR), It was a beautifully day at KTZR. Run was perfect with no leaks.
https://youtu.be/ZkQZ_FOZqZg
https://youtu.be/ZkQZ_FOZqZg
This is the checklist that I used from VAN'S POH for the RV-12iS.
It was telling me to start the engine with a Throttle Position – 50% +/-5%. That is exact what I did.
It took me about 7 sec to read through the check list from when I started it at 50% throttle position to get to reduce power to 2500 to let the oil warm up.
Then I waited for the oil to warm up took about 6-7 min, then did the runs at 4000 RPM.
Just following the checklist.
4.5 ENGINE START
CAUTION
Do not start engine when oil temp is below -13º F / -20 º C or ambient temp above 120 º F / 50 º C
Brakes – TEST & HOLD
Fuel Pump 1 Switch (912 iS Only) – ON
Lane A & B (or Ignition Switches) – BOTH ON
Lane A& B Fault Indicator Lights (912 iS Only) – Illuminate and extinguish after 3 seconds
(If, after 3 seconds, a light flashes, illuminates, or fails to illuminate, abort start and refer to 3.2.1 “Lane Fault Indications”)
Fuel Pressure – CHECK above 43.5 psi (3 bar)
Throttle Position – 50% +/-5%
Propeller – CLEAR
Ignition Key – ENGAGE (until RPM > 1,500 RPM) (10 second max activation followed by 2 minute cooling period)
Throttle – REDUCE as required.
Oil pressure – CHECK 12 psi within 10 seconds or shutdown engine
Throttle (912 iS Only) – Above 2,500 RPM for 5 seconds.
Engine Gauges (912 iS Only) – CHECK SHIFT GEN B to GEN A
Ammeter – CHARGING
Avionics Switch – ON
Fuel Pump 2 Switch (912 iS Only) – ON
Throttle =< 2,500 RPM until oil reaches 120 F (50 C)
That is correct, but to automatically apply what is known about one model of engine to another model of engine is not good. As you regularly (and correctly) recommend.... follow Rotax's recommendations/documentation.There was a post by RV2002builder about why the less than 2500 rpm when the oil temperature is below 120F.
The oil pump sucks oil from the sump tank. At lower oil temperatures, when the oil is high in viscosity from being cold, if the rpms are too high, it can cause oil pump cavitation.
Nice to know the logic behind the engine warm up and restricted rpm range.