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Cylinder 4 High EGT/CHT on Ground
I am breaking in my new IO-540 and on the fourth flight I noticed a spike in Cylinder 4 EGT after landing. To a lesser extent the CHT also climbed.
This is what the temps looked like at cruise (25"/2500rpm). Pretty normal except maybe for CHT 1 & 2 being higher - need to trim the dams a bit more. Note Cyl 4 CHT is consistently the lowest temp and EGT spread is minimal. After landing the Cyl 4 EGT crept up significantly in relation to other cylinders and Cyl 4 CHT is now the highest. What might explain this spread at ground power settings? What to check? I am thinking ignition or fuel injector blockage but am still pretty new to this. The data logs for flights 1-3 do not show this spread (EGT or CHT ) for cruise power or ground power settings. |
Before you trim anything I would look for a partial blockage in an injector or the flow divider. I had this exact scenario (but in a 4 cyl) and it was something in the flow divider.
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Suggest you first do the shot glass test to measure flow to each cylinder. Did this on an IO-360 with the same problem to find one cylinder getting much less flow at idle. The root problem was a tiny spec of crud in the spider. Carl |
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Just out of curiosity did you see any issue while at cruise power? |
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Carl |
Great, seems like the culprit, will do some testing. Thanks for the guidance guys.
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Flow test
Hi Guys,
Just out of interest How do you do the flow test? What are the shot glasses for? Best Amer |
Check out pages 70-71
https://airflowperformance.com/wp-co...anual-9003.pdf |
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Carl |
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Photos and illustrations pages 16 and 17 here: https://www.danhorton.net/Articles/B...yond%20(1).pdf |
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