Take offs - High Density Altitude

It continues to fascinates me how Lycoming still publishes this generic set of recommendations, despite the fact that an O320 is like a TIO541 only to the extent that they are flat engines and both burn Avgas. Not to mention how much hard data GAMI has produced that challenges many old tenets. For example, that 'leaned roughness is due to misfiring', when in fact it is due to unequal power pulses associated with different burn rates and mixture distribution. Anyone who has experienced a real missing cylinder knows how it shakes the whole plane, as opposed to leaning roughness. And do you think that maybe internal cylinder temps rise faster than 50 degrees per minute when you begin a takeoff? Now, I'm not suggesting that all these published directions are bunk. I'm just suggesting that it is also a good idea to balance other sources of current information along with the traditional ones.
 
Interesting topic all the way around... Here in northern Indiana we may have a DA day of 3,500' I don't remember a day higher than that but I don't fly everyday either.... I took off near gross with DA at 3,500' on a 3400' rwy full rich with 10* flaps and my 65 mouse got right off the rwy... I got about 300 fpm climb. I'm still trying to figure out leaning the IO-346... It seems unaffected at altitudes less than 3000'. Any suggestions would be greatly appreciated.. At above 5000' it seems to pur if I lean to about 7 pds of fuel pressure..
 
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