humptybump
Well Known Member
I've been watching fuel flow variations and have a growing list of possibilities and could use some help with the order I should tackle this list and what test(s) I my use for each.
Aircraft:
My RV-8 is an O320 with a fixed propeller and carburetor.
Observation:
In initial cruise (2450-2480 rpm, old school leaning, 6,000ft or higher) I am seeing a higher than normal fuel flow (near 8.5-9.5 GPH). If its a long flight - greater than 2 hours - the fuel flow will gradually settle down (7-7.5 GPH)- even though I am not changing the throttle or mixture. When I fill up the tanks, I will calculate the actual rate and find it in the 7-7.5 GPH range.
The fuel flow transducer was originally installed with a Fuel Scan 450. I do not recall issues with that setup.
Possibilities:
I was initially inclined to eliminate #2 since it worked with the FS450 but it may be a poor location for the MGL EMS data processing. The same goes for #3.
I'm interested in diagnostic tests I might try. And, on the off chance there are others out there with an MGL EMS + FloScan 201 transducer, I'm interested in your installation and observations.
Aircraft:
My RV-8 is an O320 with a fixed propeller and carburetor.
Observation:
In initial cruise (2450-2480 rpm, old school leaning, 6,000ft or higher) I am seeing a higher than normal fuel flow (near 8.5-9.5 GPH). If its a long flight - greater than 2 hours - the fuel flow will gradually settle down (7-7.5 GPH)- even though I am not changing the throttle or mixture. When I fill up the tanks, I will calculate the actual rate and find it in the 7-7.5 GPH range.
The fuel flow transducer was originally installed with a Fuel Scan 450. I do not recall issues with that setup.
Possibilities:
- Poor connection to MGL Extreme EMS
- Poor location of the FloScan 201 transducer (mounted right at the carb)
- Turbulence from engine driven fuel pump
- Poor signal processing inside the EMS (less tolerant ?)
- Your guess
I was initially inclined to eliminate #2 since it worked with the FS450 but it may be a poor location for the MGL EMS data processing. The same goes for #3.
I'm interested in diagnostic tests I might try. And, on the off chance there are others out there with an MGL EMS + FloScan 201 transducer, I'm interested in your installation and observations.
