PERFORMANCE
The FM-150L was calibrated using the standard calibration for a Lycoming 180 HP engine. Injector nozzle sizes were the same for each cylinder. After initial run up and idle mixture adjustment a leak check was made before cowling the plane. Of interest was take off fuel flow. This based off of Lycoming charts, showed that the engine was making around 175 to 180 HP.
WOT Take Off 2700 RPM, Fuel Flow 15.1 GPH, 29.7? MAP (MAP before engine start 30.2?)
3500 Feet, 2400 RPM, 24? MAP
Full Rich Fuel Flow10.5 GPH, EGT/CHT #1 1214/343, #2 1261/335, #3 1217/343, #4 1238/336
All cylinders peaked at 7.7 GPH with EGT #1 1412, #2 1465, #3 1428, #4 1452
The fuel rich fuel air ratio .086 (AF 11.6). Peak EGT fuel air ratio .065 (AF 15.4)
GAMI spread <0.1 GPH. CHT spread 8 degrees F
3500 Feet, 2500 RPM, 22? MAP
All cylinders peaked at 7.2 GPH with EGT #1 1431, #2 1478, #3 1445, #4 1468
GAMI spread <0.1 GPH
8500 Feet, 2500 RPM, 22? MAP
All cylinders peaked 7.8 GPH with EGT #1 1412, #2 1457, #3 1418, #4 1452
GAMI spread <0.1 GPH
LOP operation engine smooth 6.5 GPH with EGT #1 1280, #2 1309, #3 1294, #4 1309
Running approximately 125 degrees LOP with smooth engine operation the fuel air ratio was approximately .055 (AF 18.2)
IN CONCLUSION
The design goal was met to install a fuel injection system in a stock RV 320 cowl without modification. Van?s standard air box design for a 320 engine proved adequate for providing inlet air to the fuel injection system. Acceptable engine performance was made using the stock up draft intake sump and standard Vans cowing for cooling the engine. Based on climb performance compared to a similar RV-6 with O-360 engine and constant speed prop the Titan 340 engine with Airflow Performance fuel injection made similar power. Fuel distribution was good using stock Airflow Performance injector nozzles used on a Lycoming 320 engine with GAMI spreads less than 0.1 GPH. Smooth LOP operation was run in excess of 100 LOP. This installation makes possible installation fuel injection on older RV-4?s and RV-6?s with Lycoming 320 engines using the smaller 320 cowl without modifying the cowl.
So if your interested in more details or some pictures of this installation please email me at
don@airflowperformance.com