Forum made EFI?


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Well-Known Member
Jun 26, 2012
Calgary, Alberta, Canada
It is standard practice on the Pratts to enrichen and re-lean every hour or 1,000 foot of altitude change. It is good to start at a baseline periodically with them.
I've flown Pratt DC-3s a bit, right seat, eons ago. Never did this. Select auto-rich or auto-lean as the case may be.

In any case, we don't do this on modern EFI equipped engines either. Once cruise power is set, we select LOP mode usually via the switch or keypad. This leans the programmed amount (usually 20-25%) and simultaneously advances timing 3-5 degrees to help restore some of the lost power due to the slower burning lean mixture. Climb mixture is automatically controlled by MAP and baro.

I thought this thread was about simple EFI to replace carbs on small 2 and 4 stroke engines. What will be gained with more layers of complexity on these small engines which don't burn much fuel to begin with? 2 strokes certainly don't take kindly to be running lean at all.

We are currently working with a company in the US to develop an SDS kit for the Honda 650 single cylinder engine for aviation.
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Hot Wings

Grumpy Cynic
HBA Supporter
Log Member
Nov 14, 2009
Rocky Mountains
<< >> but activation is still using the biological ECU (pilot) as the logic signal.
Thanks! So it turns out that we ARE in agreement.

It matters not if we are interacting with a machine or a human. If we don't tell them what outcome we want the other party is left to guess our intent. Once the goal is established we can then let our CPUs and political representatives take care of the details.
The CPUs probably do a better job. ;)


Well-Known Member
Jan 29, 2014
Krasnoyarsk, Russia
Exept for ECU other components of kit very important
1. Tested GY6 generators stock. Got only 24W at 5000rpm with stock rectifier. Make our in-house. Result on graph.
test.jpgPower Gy6.jpg
Second - using different third part components we made in tank brushless pump with pressure regulator which weight 212grams and consume just 12W.