On 10/29/2023 5:49 AM, Phillip Matheson via KRnet wrote:
Then running hot, so, more time taken to modify cowl inlets from 3 inch to 5
inches.
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Phil,
Sorry to hear of all your setbacks. These too shall pass. You guys
down under are going in to summer now, right?
On the "running hot" problem, the bottom side of the cowl is just as
important as the inlet. You have to develop a good low pressure on the
bottom side of the engine. I actually closed down the inlets on my
modified 0-200 cowl a bit and my 0-200 still ran cool. I think there is
a ratio of top to bottom opening area to shoot for, 1X1.5 comes to mind
but that is a guess on my part. Tabs shaped like cowl flaps or actual
cowl flaps like Jeff Scott made should help the issue.
I hope with all the money spent you ended up with a Marvel-Schebler
carb. Those things are hard to kill and have worked on farm tractors
for 100 years but insure good carb heat and don't be afraid to use it.
I never hesitated to cruise with carb heat on if conditions were
favorable. Carb heat does not hurt an engine it only cuts power output
a few percent. For those of you flying Lycomings, I'd suggest regular
use of carb heat in spite of what the operating manual says. My friend
would be flying his RV10 instead of it setting in the shop being rebuilt
after an off airport landing, his second due to carb ice. Even a high
horsepower Lycoming running at very low power settings will ice up.
Good luck.
Larry Flesner
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