Hello,
Does anyone notice that the fuel flow indication has a bit of fluctuation?
I set the fuel flow in cruise and it seems to vary +/- 0.8 GPH....
Thank you Larry. I spoke with my A&P. He tells me that the FF indicates fuel in to the bowl of the carburetor will vary with the carburetor float position. The mixture cable s controlling what actually goes from they bowl to be mixed wth intake air. I guess this makes the actual value less significant than in a fuel injected engine. Hence leaning by egt is more relevant than fuel flow from what I understand
I do not agree with your A&P. While the fuel does go into the bowl, the fuel level in the bowl is fixed (float position is just a regulator to keep it at that pre-determined level and it is quick reacting) so what goes in is directly related to what went out through the jets. My engine started life as an O-320 and I also had very stable FF indications with the carb, especially in cruise conditions where the flow is stable and consistent.
Larry
The level might be fixed within certain limits but the flow in to the bowl and out via the needle valve are two different items. A float wouldn't be needed otherwise Kind like like a toilet tank.
The level might be fixed within certain limits but the flow in to the bowl and out via the needle valve are two different items. A float wouldn't be needed otherwise Kind like like a toilet tank.