Re: Q2 to to Q200
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Your friend probably has the Bing carb on his (that is the standard equipment). It turns out that there is a kind of trial and error you have to do on the Bing to get the right needle for operations dependent on the elevation where you normally operate. The high fuel flow at high power is normal and ok to keep the heads from overheating, but rich mixture has its own problems if you persist a that richness/power setting. His 5 gph at cruise is about right for that engine.
There is a lot of discussion about the Bing carb on the JabCamit engine site (I am the admin of that io group) and how to get it set properly. I did some “reading between the lines” on this subject before I even installed my engine and I decided to go with the Rotec throttle body injector. It is a direct copy of the Ellison throttle body. At my altitudes leaning is a requirement, so rather than mess with the Bing, I just skipped it entirely. I am very happy with my results. My full power fuel burn is about 8.5 gph, but I have never had it even close to sea level, so I am really not at “full power” (maybe 75% at most). I would expect to see >10 gph, if I were to be down where you are, just to keep the EGT’s withing limits. Maybe I will get down to the coast sometime and let you know.
From: main@Q-List.groups.io <main@Q-List.groups.io> On Behalf Of Mike Dwyer
My buddy has a 3300 on his Aeron Lightning. He sets his cruise by Fuel flow. At full power he sees like 12 GPH but sets his cruise to 5 GPH. It appears this engine runs really rich mixtures at higher power. He has carbs and no mixture control. Is yours like that?
On Tue, Mar 10, 2020 at 10:22 AM Jay Scheevel <jay@...> wrote: