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On any of my engines I've found that ~ 18:1 is about as lean as I can go without a lean stumble. 17:1 seems to be sustainable, but only under quite light loads.
EGTs don't mean much because of the water cooled manifolds. The highest I've recorded is ~ 650 degrees F.
Engine loading on a boat depends on where the shaft speed is in relation to the propeller power demand curve. My normal cruise is ~ 2000 RPM, ~60 KPA manifold absolute pressure (~ 12.5" HG manifold vacuum) load. I consider that to be a relatively light load.
Why would I want to consider EGR?
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Robert
'95 Ford E150 4.9L I6 Megasquirt MS1 Custom MSnS Extra
'92 Winnebago Elante 33 RQ Ford 7.5L V8 Megasquirt MS1 Custom MSnS Extra
'93 Bayliner 3288 Twin Ford 5.8L V8s (351 Windsors) converted to tuned port EFI. Megasquirt MS1 Custom MSnS Extra
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