Talk about air to fuel ratio

David G · Oct 26, 2018

When I work on engine combustion, I get thinking.

This is the AFR table from my MH44, you create this table, then tune the mixture to attain this.

I really never took time to fully flush it out.

Bruce(OR) · Oct 26, 2018

13.5 is not quite stoichiometric. Those numbers get you in the rich area.

David G · Oct 26, 2018

I ran it rich under load to protect engine, think I will research this winter and redo next spring.

Comments are welcome.

David G · Oct 26, 2018

Peak torque is about 900-1000 RPM

4play · Oct 26, 2018

You don't want to be stoich all the time, in fact hardly at all. This graph represents an ideal AFR after you consider engine load.

The ideal AFR for max power is around 12.5-13.5:1
The ideal AFR for max economy is around 15-16:1

Geo-TH,In · Oct 27, 2018

David,

Many years ago a friend had a single engine aircraft. He would tune the carb to get max exhaust temp.

So how does the ideal FAR compare to the exhaust temp?

UncleTom · Oct 27, 2018

David, what part of Israel are you going to. I got to looking around on Google Earth and in street view you can go down on the street just as if you are standing there. the google car was all over Israel. People are walking around on the streets and i never saw any one with guns.

MarkB_MI · Oct 27, 2018

Is your setup open loop? Or does it use an O2 sensor to tweak the mixture in real time?

Talk about air to fuel ratio

David G

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Bruce(OR)

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David G

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David G

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4play

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Geo-TH,In

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UncleTom

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MarkB_MI

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