The problem is not the air coming in.  There is more than enough air .  From our extensive research, the problem is where it does and doesn't go.

Walter



On Jun 8, 2008, at 10:18 AM, gerardoconnell@optusnet.com.au wrote:

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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