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Project Blue Angels SeaRey
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Date: 11-24-2013
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Number of Hours: 4.00
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Manual Reference: None
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Brief Description: Wired the Air/Fuel Ratio meter
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This is a fully electronic engine that should manage the fuel and air ratio appropriately at all altitudes, so no mixture control I have to fool with, but I want to ensure it's doing its job, so I installed an ARF meter.
I've had a lot of experience with Air/Fuel Ratio meters in high performance boats. They used to be a huge pain to wire and configure, but this Innovate MTX-L is the same one in my boat now, and it's so easy and just works. In the SeaRey, I did have to get the 18’ extended wiring that goes from the oxygen sensor in the exhaust to the gauge. Other than plugging that in, there's just a power wire, ground wire, and I wired one more wire to my NAV lights for display dimming, since I’d only have those lights on close to dark.
Initially, the engine is running fairly rich at idle at about 11.0 stoich, instead of a more expected 13.0-15.0. Something I’ll have to keep an eye on. An engine actually produces more power with less fuel in the mixture, up to the point that a lean condition begins to heat things up too much. 11.0 stoich is what my boat is tuned to run at full throttle with high boost… should need nowhere near that with this engine. Might be just breaking itself in.
UPDATE: Like I suspected, after the first hour of run time, the engine is now idling up in the good 13.0 range, so no problem.
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Running rich at idle
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Easy to wire
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