New Air-Fuel meter Video


Below is a link to a video that we just put up. It is a few minutes on Air-Fuel meters, and the gauge we use for testing, which is also recommended for airplanes flying a Corvair.



For a look at how the testing we do is integrated with other facets of the engine like the ignition timing, look at this: “Corvair Fast Burn” Ignition timing settings


This story: Air / Fuel ratios on Corvair carbs.  (2016) is a look at the range of air fuel mixtures we use, and how we previously tested this.




About William Wynne
I have been continuously building, testing and flying Corvair engines since 1989. Information, parts and components that we developed and tested are now flying on several hundred Corvair powered aircraft. I earned a Bachelor of Science in Professional Aeronautics and an A&P license from Embry-Riddle Aeronautical University, and have a proven 20 year track record of effectively teaching homebuilders how to create and fly their own Corvair powered planes. Much of this is chronicled at and in more than 50 magazine articles.

3 Responses to New Air-Fuel meter Video

  1. Dale Walters says:

    What a timely post for me. Previously I had tried using an O2 narrow band sensor, but could never get it to work (I had gone through 2 or 3 of the cheap knock-offs).

    So failing that, I leaned using the EGT, but I was never sure that I was leaning for best power/efficiency.

    When I saw this video the other day, I purchased it immediately and installed it yesterday. A short test flight (~ 1 hour) showed me that I was previously leaning WAY too much… around 15.5 – 16.0. Yikes!

    The only question I have is that the display fluctuates between .4 and .6 %. William, I also have a dual-points distributor… would upgrading to an E/P distributor fix this? (I also have an MA3 carb)


    • E/p is a good idea, but probably not change the display issue. Make sure you are following the new MOP manual, particularly if you have an older installation

      • Dale Walters says:

        Thanks William; I’ve been using the MOP manual (I had picked up one from you at the Zenith Open House). My oil press/temps are right as you suggest; I think my biggest issue at this point is the distributor (my rpm’s will also fluctuate 30-50 rpms).

        I think my answer is to get the E/P (hopefully in the next month or two, before flying weather returns to PA), get it in and adjusted. (Remember, mine is the plane where the guy doing my condition inspection never checked the timing)

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