wjb
Well Known Member
I've found an interesting EGT oscillation after hot start that I request the VAF brain trust to opine upon ... This shows up after a hot start during taxi. IO-360-M1B, 30 hrs TTSN, running great in all other respects. The engine broke in nicely during phase 1 and is purring along happily.
I noticed a ~10 second oscillation in EGT after a hot start at low power operations (ie, taxiing back to hangar or departure end after a fuel stop). The plot below shows it on #4, but I've also seen it on all cylinders together (#4 is the most common). This clearly doesn't seem to be the burnt exhaust valve oscillation generated by the rotator cap, but may be due to hot fuel in the spider after a heat soak.
Go fly, and this doesn't ever show up again (until a hot start + taxi ...)
What say you, VAF brain trust?
I noticed a ~10 second oscillation in EGT after a hot start at low power operations (ie, taxiing back to hangar or departure end after a fuel stop). The plot below shows it on #4, but I've also seen it on all cylinders together (#4 is the most common). This clearly doesn't seem to be the burnt exhaust valve oscillation generated by the rotator cap, but may be due to hot fuel in the spider after a heat soak.
Go fly, and this doesn't ever show up again (until a hot start + taxi ...)
What say you, VAF brain trust?
![cht-osc-XL.jpg](/community/proxy.php?image=https%3A%2F%2Fphotos.smugmug.com%2FN430WB%2Fn-k6wFKr%2FN430WB-Flying%2Fi-gZkTKBG%2F0%2Fe8774b2d%2FXL%2Fcht-osc-XL.jpg&hash=437ce0dfb158032ab42d32c6731ae7b1)
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