POH vs. Lycoming Engine Operator's Manual

[CraigH]

I'm guessing this will turn out to be a stupid question that I should know the answer to, but here goes anyway:

Looking at the Lycoming Engine Operators manual, it gives the following figures for the 0-235-L series:

Normal Rated Power - 118hp at 2800 rpm 9.5 gph
Performance Cruise - 89hp at 2500 rpm (75% power) @ 6.7 gph
Economy Cruise - 77hp at 2400 rpm (65% power) @ 5.8 gph


However, looking at the aircraft POH, it gives the following:

Take Off Power (5 min. Limit) - 118hp at 2800 rpm
Normal Rated Power - 112 HP at 2600 rpm @ 9.0 gph
Performance Cruise - 84hp at 2350 rpm (75% power) @ 6.3 gph
Economy Cruise - 73hp at 2250 rpm (65% power) @ 5.5 gph


What gives? Which is correct and why the difference?

[lktiller]

Looks the same to me.

Engine manual gives max & optimum numbers

POH gives usable numbers with that airframe

Don't take either for absolute truth! Yours may be slightly different.
Books are only a starting point to finding your own numbers.


Not an engine 'spert

LKT