An We Discuss IO360A1A Fuel Flow?

[A64Pilot]

7 hours ago, Fly Boomer said:

 

Usually my Google Fu is pretty strong, but I can't find the source for this interactive tool.  Where did you generate these?

 

It’s an app on Apple app store called aircraft power.

I don’t believe it lines up exactly with the POH charts as they include installation losses and this app couldn’t.

But it’s real handy to determine % power without having to pull out charts

Close is good enough

Edited May 14, 2022 by A64Pilot

[A64Pilot]

1 hour ago, PT20J said:

Let's see what a reasonable full power air flow upper limit would be for an IO-360.

There are two intake strokes per revolution at 90 cu in each. At 2700 rpm, that works out to 16875 ft³/hr. Sea level air on a standard day has a density of 0.074887 lbm/ft³. So it works out to a volumetric mass airflow of 1264 pph. The IO-360 has a pretty good induction system and the angle valve head is supposed to be pretty efficient, so if the volumetric efficiency is 95% , that would give us around 1200 pph.

What does that mean in terms of fuel flow? Averaging the RSA min/max fuel flow limits previously posted for the measurement points of 600 pph and 1400 pph airflow and interpolating for 1200 pph yields 17.4 gph fuel flow. So within measurement accuracy, this all seems to make sense.

Skip

I don’t think breaking in will change volumetric efficiency, it may slightly increase HP from friction losses though, with a well tuned exhaust system volumetric efficiency of over 100% is achievable, but I think your 95% is probably pretty close.

Unlikely our exhaust is tuned, it doesn’t look like it anyway.

Ref mixture at WOT, a little rich hurts nothing and likely helps in cooling. My motor is a Gann “performance” motor and I believe beyond the balancing he does he also ports and polishes. I’m pretty sure whoever he gets to overhaul the injection he has set a little rich, on a standard day, I’m closer to 20 GPH on takeoff. But 15 is too lean if at sea level

[Fly Boomer]

30 minutes ago, A64Pilot said:

It’s an app on Apple app store called aircraft power.

Thank you.  I'll have it on my iPad before the sun sets.

[BRBENNETT]

Have you double checked your actual fuel burn with reported fuel burn by the JPI?  Perhaps the K factor may be off?

just another possibility since you had an overhaul.