REFLECTOR: CHT too cool
Brian Michalk
michalk at awpi.com
Tue Jun 9 10:18:49 CDT 2009
Duh. It's right there.
With low CHT's, it's an excellent opportunity to advance timing. Yours
might be a little late, and advancing should bring the temps up a
little, because you would be making more power.
Chuck Jensen wrote:
> Cylinder head temp problems are not unusual, but I have a different
> twist. My CHT's are too cool. I can only recall once or twice that a
> cylinder head ever got to 400F. Most run 350F to 390F during hot,
> hard climbs, but at cruise, and running lean of peak, it's not unusual
> for 2 to be below 300F and the rest just barely over 300F.
>
> Now, it well known that engines are most efficient at higher temps and
> I believe Lyco's recommendation for an IO-540 K1A5 is CHTs in the 375F
> to 400F temp range. This would also seem to imply that I'm suffering
> unnecessary cooling drag from overcooling the CHs. Oil temps at
> cruise are 195F-200F but will rise to 240F during long climbs.
>
> So, my question is, 'is there a way 'adjust' cooling to CHs' that may
> reduce drag by reducing inflow through the overhead NACAs for
> downdraft cooling, without sending the CHTs too high during climb or
> aggravating oil temps during those climbs as well?
>
> Chuck Jensen
>
>
>
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