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Yes, The main difference between TSIO (Turbo Supercharged) and TNIO (TurboNormalized) is compression ratio (TNIO is just like IO - 8.5:1 and TSIO is 7.4:1 - 550s and 520s) and Manifold pressure for TN is never above 32 (sea level pressure), TSIO 36-42 and more depending on model.

The take-off distance is not that big of a deal for me as much as being able to go farther faster. I agree with 550 would give me approximately 5-7 ktas more and it doesn't seem to be worth the extra $$ and 3gph. TN-520 is appealing because I can go to upper teens and take an advantage of winds...

my centurion is 400 h past TBO still strong engine, but time for OH is near. Currently there is IO-520L. Running LOP - it is slow especially with my radar pod. I love the ability to go above the weather and fast, but my primary flying is within 200 NM range. Should I put IO-550 in it (with new...