4 ms·
I feel like I've said this already but carbureted and mechanical FI in aircraft often do not have even fuel distribution; that is not all cylinders receive the
by maximilianburke 4y ago
I feel like I've said this already but carbureted and mechanical FI in aircraft often do not have even fuel distribution; that is not all cylinders receive the same amount of fuel. If you have an injector on (in) each cylinder, you do. If you have O2 sensors on each sensor the ECU can adjust mixture on the fly and ensure that each cylinder is running optimally
The SDS EFI people claim up to a 20% fuel effiency gain by going to multipoint fuel injection on existing engines.
If you have consistent cooling (hey, guess what, those rear cylinders on an O-540 are running hotter than the fronts), you can run more timing and more compression.
More timing, more compression, less fuel = more efficiency. Basically everything I'm talking about is more cruise power efficiency!
- sokoloff 4y agoThe premise of GAMI injectors is that not all cylinders are supposed to receive the same amount of fuel, because they don’t all receive the same amount of air. The intent is to achieve the same air-fuel ratio, which means having different injector sizes for different cylinders. I have GAMIs; they are one per cylinder, just like the factory injectors were, but provide closer matched air-fuel ratios. I also have per-cylinder EGT and CHT instruments and have measured less than 0.3gph spread (about 2%) between the leanest and richest cylinder. Modern cars are rarely measuring per-cylinder fuel, but rather measuring the average of half or all the cylinders and using that to adjust short and long term fuel trims.
- sbaiddn 4y agoYouve added a pretty sophisticated complication to that engine. What happens if the O2 sensor fails in flight? Also, I dont know that you want to increase the compression on the hot cylinder. If anything Id run rich to make sure it doesnt knock