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- #121
A normally aspirated engine loses about 3%/1000'. At about 14-15,000' a normally aspirated engine does not have enough excess power to climb further. Surely Ford isn't saying the normally aspirated 7.3 is gunna keep up with the turbodiesel as they climb?
That's what the manual is suggesting, even though you're right that a naturally aspirated motor won't keep up with a forced induction motor at elevation.
That said, both of these motors have power so far in excess of the platform limits that I don't know why they bother with this caveat at all. There's no safety issue.
In the RV & Trailer Towing Guide they're more specific about this applying to Gasoline (as a proxy for naturally aspirated) engines.
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