WINDTUNNELMECH Posted July 9, 2019 Share Posted July 9, 2019 I have an old 501D13, (T56) built in 1954. We use it to pull air through a wind tunnel. I had to swap it out with an engine that was sitting in an engine can for 5 years. The new engine is giving me hot starts and high fuel flow at ground idle. I checked and rechecked the rigging. Swapped the TD valve and fuel control. This engine is unique, it does not have a TD amp, or TD control. Any ideas at what else I can look at or swap out to see if I can get this problem fixed? Its a difficult problem to diagnose because its run by a computer using a PLC. Quote Link to comment Share on other sites More sharing options...
pjvr99 Posted July 10, 2019 Share Posted July 10, 2019 what is max power fuel flow and TIT? For that matter what is start TIT, TIT & ff at LSGI and normal ground idle? Quote Link to comment Share on other sites More sharing options...
PauloFerreira Posted July 10, 2019 Share Posted July 10, 2019 16 hours ago, WINDTUNNELMECH said: I have an old 501D13, (T56) built in 1954. We use it to pull air through a wind tunnel. I had to swap it out with an engine that was sitting in an engine can for 5 years. The new engine is giving me hot starts and high fuel flow at ground idle. I checked and rechecked the rigging. Swapped the TD valve and fuel control. This engine is unique, it does not have a TD amp, or TD control. Any ideas at what else I can look at or swap out to see if I can get this problem fixed? Its a difficult problem to diagnose because its run by a computer using a PLC. Hi!!! If you have already checked the rigging, you have to register START TIT, RPM and FUEL FLOW (as said by pjvr99), if those values are too high, check the LSGI regulation on the FCU. Assuming that the engine works full mechanically (NO TD Amplifier), The Temperature and RPM are in accordance with the Fuel supplied by the FCU. If you reach on a good compromise (TIT and RPM) at LSGI you will have good values at HSGI. Let us Know more details! Quote Link to comment Share on other sites More sharing options...
WINDTUNNELMECH Posted July 10, 2019 Author Share Posted July 10, 2019 Start TIT was 1680F RPM is 73 Percent and Fuel Flow is over 800PPH Quote Link to comment Share on other sites More sharing options...
pjvr99 Posted July 11, 2019 Share Posted July 11, 2019 wow, that is a little warm ..... try decreasing the CIT setting (1 flat is +-25°C/45°F), then trim it using TD valve NULL orifice adjust Quote Link to comment Share on other sites More sharing options...
PauloFerreira Posted July 11, 2019 Share Posted July 11, 2019 16 hours ago, WINDTUNNELMECH said: Start TIT was 1680F RPM is 73 Percent and Fuel Flow is over 800PPH Some more Troubleshooting: Bleed Air Valves do not open during start Check Speed Sensitive Valve Remove and clean / Replace Bleed air valves Teflons Anti-Icing Valves Open during start Check anti-icing valves Hope to be Helpful! Regards Quote Link to comment Share on other sites More sharing options...
pjvr99 Posted July 15, 2019 Share Posted July 15, 2019 Any luck with your beast WINDTUNNELMEC? Quote Link to comment Share on other sites More sharing options...
WINDTUNNELMECH Posted July 15, 2019 Author Share Posted July 15, 2019 When I started again I decided to bring the engine up to Flight idle. Then I tried increasing throttle, it doesn't seem that my throttle is changing the blade angle. Quote Link to comment Share on other sites More sharing options...
WINDTUNNELMECH Posted July 15, 2019 Author Share Posted July 15, 2019 When I brought it up to flight idle, the engine got cooler significantly, and with increase in throttle I did not get higher TIT, fuel flow or tunnel speed. Quote Link to comment Share on other sites More sharing options...
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