I was hoping someone could help me out with this one...
RV-7
Setup: Mattituck IO-360 std pistons
Precision airmotive silverhawk EX fuel system
Airflow performance boost pump
I cant really say when these symptoms started, it was (apparently a slow process) not a sudden something is wrong kind of thing...
On take-off I am getting 15gal/hr fuel flow (sea level and 85F) and with 120 kts and after only 1500 feet climb my CHT's reach 400 degrees. This combination leads me to wonder whether or not I have a slightly low fuel flow. I somehow remember that in the past I was seeing more than 16, almost 17 gal/hr (which would also match the 1gal per HP rule of thumb).
I did the standard troubleshooting steps, cleaned all filters (boostpump and servo inlet filter), checked the fuel systems max FF (60gal/hr) and checked the flow gauge accuracy (less than 0.2 gal/hr off).
What would you say is the next step? I did not flow check the nozzles yet since the CHT's are within a couple degrees. I figured that this would mean that all nozzles would be clogged the same amount (which is a rare occurrence).
I was thinking about checking the flow divider (clogging, binding?) but have no clue how to do that. Can I just lift the cover off with the housing mounted to the engine or will I have springs and diaphragms flying in all directions if I do that?
this setup is only 150hrs young so I have no idea what is going on OR if I even have a problem and I am imagining things. The engine runs great otherwise, cruise, climb, idle all smooth.
Thanks in advance for all your help
Marco
RV-7
Setup: Mattituck IO-360 std pistons
Precision airmotive silverhawk EX fuel system
Airflow performance boost pump
I cant really say when these symptoms started, it was (apparently a slow process) not a sudden something is wrong kind of thing...
On take-off I am getting 15gal/hr fuel flow (sea level and 85F) and with 120 kts and after only 1500 feet climb my CHT's reach 400 degrees. This combination leads me to wonder whether or not I have a slightly low fuel flow. I somehow remember that in the past I was seeing more than 16, almost 17 gal/hr (which would also match the 1gal per HP rule of thumb).
I did the standard troubleshooting steps, cleaned all filters (boostpump and servo inlet filter), checked the fuel systems max FF (60gal/hr) and checked the flow gauge accuracy (less than 0.2 gal/hr off).
What would you say is the next step? I did not flow check the nozzles yet since the CHT's are within a couple degrees. I figured that this would mean that all nozzles would be clogged the same amount (which is a rare occurrence).
I was thinking about checking the flow divider (clogging, binding?) but have no clue how to do that. Can I just lift the cover off with the housing mounted to the engine or will I have springs and diaphragms flying in all directions if I do that?
this setup is only 150hrs young so I have no idea what is going on OR if I even have a problem and I am imagining things. The engine runs great otherwise, cruise, climb, idle all smooth.
Thanks in advance for all your help
Marco