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In my IO-390 RV14 I have taken off a number of times in high density altitude conditions. For example, on the way to Air Venture just a few years ago. On one leg I departed Las Vegas at 113 F, and then later that day in Utah and Montana at higher altitudes and temps in the low 90's. The climb performance was definitely compromised - I don't recall what it was exactly, but acceleration was slower, T/O roll was noticeably longer, as was the climb rate. Normally, with just me and half fuel, I'm getting about 2000'/min ROC initially (in standard conditions). I would say I was getting about half of that. Still not terrible, but nothing like I was used to getting. I only mention this as even though the RV14 performance is still 'good' in these conditions - its not what you may be used to normally. I'd definitively factor this in to my thinking about whether I'm going to clear an obstacle (like a mountain ridge or treeline). Lastly, managing Oil and CHTs in these conditions is also an added challenge. Don't expect to do a long sustained climb (even at the reduced ROC) without temperature limit alarm bells going off. Per the other fellow's suggestion - probably a good idea to find room for a slow climb, even if it means carving circles somewhere.
