O-320 full throttle fuel burn

[Camillo]

Before my first flight I wanted to be sure that the engine will receive enough fuel.

So, I disconnected the fuel hose just before the carburetor, pulled up the nose 13? (tail almost touching the ground) and activated the electric pump for 1'.

I obtained approx. 0,40 US Gallons, which is approx. 24 USG per hour.

Lycoming O-320 manual states that the engine burns 10 USG per hour @2.450 RPMs. But beside the 2.700 RPM no data is indicated.

Which is the predictable fuel burn for an O-320 at full throttle?

Thanks.
Camillo

[vlittle]

O-320 full power, full rich is 13.6 gph. Add 25% safety factor and you need about 17 gph at maximum deck angle. Your measurement of 24 gph is just about what I got.

No need to tilt the airplane, just raise the full line up like this:



I used 22.5 degrees after consultation with Vans for my RV-9A. This required raising the fuel line 16" above the carburetor. You can calculate the required height by knowing the climb rate plus the angle of attack.

Don't worry, though. Your 24 gph is fine.

Vern

[Christopher Murphy]

When I race my 0-320 RV-4 at lower altitudes and full rich at 2800rpm it burns exactly 14 gph.

Chris M

[Camillo]

Thank-you for your answers.
I only need to be sure that during my first take-off engine will not shut off, provided that I will not pull more than 10?.

Then, when at a safe altitude I will try greater pitches on both tanks.

Nice idea, Vern. Too late to adopt it.

Ciao.
Camillo