wakataka
Well-Known Member
Yesterday I did the $100 hamburger thing and flew my Kawasaki 440 powered ultralight to an airport about 45 miles away to get lunch. I should mention that I'm flying a new engine, with new seals and gaskets, and only about 5 hours of run time. On the outbound flight, burning the premium fuel from the local no-name station that I usually run, EGT was running a little below 1,100 degrees. On the return flight, burning premium fuel from a nearby Chevron, the EGT was just below 1,200, at the same altitude and RPM. CHT was the same in both directions. There was no detectable change in the engine performance other than the higher EGT. I've never run Chevron fuel in this engine before. Chevron is supposed to be good quality fuel, but the station I bought it from doesn't do a lot of volume so the fuel may sit in their tanks for awhile. The place I usually buy fuel is one of the cheaper and therefore busier stations around so there is likely frequent turnover of the fuel in their tanks.
I'm wondering if anyone has ever experienced a change in EGT associated with using a different brand of fuel?
On the next flight, I plan to drain the remaining Chevron fuel out of the tank, replace it with my usual no-name fuel, and see if the EGT goes back down to the normal 1,100 degree range. If that doesn't fix it, I guess I'll raise the needle up a notch to richen the mixture a bit. I'd just like to know why it changed.
I'm wondering if anyone has ever experienced a change in EGT associated with using a different brand of fuel?
On the next flight, I plan to drain the remaining Chevron fuel out of the tank, replace it with my usual no-name fuel, and see if the EGT goes back down to the normal 1,100 degree range. If that doesn't fix it, I guess I'll raise the needle up a notch to richen the mixture a bit. I'd just like to know why it changed.
