Super Cub to 23000 feet - Engine/mod combo?

skywagon8a said:

I agree with MTV, you are leaving a lot of horsepower on the table. You should be able to go to full throttle or nearly so down low without exceeding 2700 rpm. At altitude your maximum manifold pressure will be reduced. So at 15,000 you would be lucky to get 60% power at full throttle 17" mp and 2700 rpm. Take a look at Lycoming's power chart.

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DJ said:

Please explain. I'm not sure I understand.
At altitude where I fly 90% of the time I can go WOT with the Catto in level flight and it turns 2650-2700.
Overall Ive been pleased with how the Catto does at altitude. It doesn't seem to run out of bite like the Borer reportedly does.

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skywagon8a said:

You stated "Down low it will overspeed very easily at more than 2/3rd throttle." That is indicating that you are using less than maximum available power. You are operating in a unique environment. At your most critical take off altitude are you getting at or near 2700 rpm with full throttle? If so then change nothing as that is where you need the power, on take off at a critical altitude.

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