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Thanks Guys for all your suggestions regarding lowering the CHT's. I decided to modify the top cowl and have attached a photo.
We decided that the main issue was cooling of cylinders 2 & 4 on the left side with 4 being the hottest. The reason was probably the fhe governer blocking airflow and engine air being drawn through the filter. I have had one 20 min test flight and CHT's have dropped from 415 F to 380 F for number 4 in cruise. I will have a 3 hiur flight tomorrow at higher level and see how she goes.
Will report back
Gerard
Image004.jpg
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