REFLECTOR: Franklin CHTs

[John Dibble]

Now I'm wondering if my CHTs (230-266F) are too low.  My manual only
shows max temps.  Anyone know what the minimum CHT temp is or what the
ideal temp is?
My cowl exit is one large oval opening.  Maybe that is why my temps are
low.
John

MikeWatsonSpg at cs.com wrote:

> For those having high CHT problem with Franklin engines,
> I received this info from Duane.
>
> Mike W.
>
> Thanks for the posting. I am wondering if you have tried enlarging the
> exit area by putting a "cowl flap" on the bottom cowling toward the
> rear. If an opening of, lets say 4", extending down from the cowling
> not only resolved the problem but actually caused the engine to run
> tooooo cool in cruise, then either hinge this flap and actuate it with
> a push pull cable or experiment with a 3". If this works OK try 2"
> etc. until your satisfied with the results. I know of 4 Franklin
> powered Velocities, not counting the one we flew, that apparently did
> not have this problem. Perhaps they simply done the step climb and
> ignored the problem, I don't know. In any case, be the hero and try
> the "cowl flap" and report your results to me and to the reflector
> group.
> Duane
>
>
>>
>
>
>
>
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