Hi Gentlemen, looking for your considerations about my Lycoming O-3??; why question marks?
Here the problem. Documents state it’s a O-320-E2G but…
It was rebuilt many years ago so, even if it was running like a Swiss clock, after discovering some little discrepancies (small oil leakage, oil press probe not the right one and drip stick as well) and considering the age I decided to proceed to a “zero hour maintenance”; and here arrived the surprise.
Pistons and cylinders were 320 type, carburetor an Ellison TBI SF4 (suitable for 320) but the crankshaft was the 360 as well as the connecting rods. Changed pistons, valves and cylinders (in very bad conditions) with new 320 ones and inspected crankshaft and rods in very good conditions.
The engine, originally, was “Bluprint” treated; may be the reason of the heavy traces of overheating on pistons, cylinders head and valves? Sparks had no signs of that; actually they looked like if the mixture was too rich. Thanks to this Bluprint treatment documents stated a 175hp.
Now: with new original O320 pistons and cylinders but shaft and rods of the 360, what is the power that can be expected? I’ve been told that, since the shaft and rods are the 360, a O360 power more or less, can be assumed; is it correct? Do I have to install a O320 or an O 360 carburetor?
At the time of the engine’s inspection it had 140 hrs since rebuilt.
Thank for any consideration and have the best.
Here the problem. Documents state it’s a O-320-E2G but…
It was rebuilt many years ago so, even if it was running like a Swiss clock, after discovering some little discrepancies (small oil leakage, oil press probe not the right one and drip stick as well) and considering the age I decided to proceed to a “zero hour maintenance”; and here arrived the surprise.
Pistons and cylinders were 320 type, carburetor an Ellison TBI SF4 (suitable for 320) but the crankshaft was the 360 as well as the connecting rods. Changed pistons, valves and cylinders (in very bad conditions) with new 320 ones and inspected crankshaft and rods in very good conditions.
The engine, originally, was “Bluprint” treated; may be the reason of the heavy traces of overheating on pistons, cylinders head and valves? Sparks had no signs of that; actually they looked like if the mixture was too rich. Thanks to this Bluprint treatment documents stated a 175hp.
Now: with new original O320 pistons and cylinders but shaft and rods of the 360, what is the power that can be expected? I’ve been told that, since the shaft and rods are the 360, a O360 power more or less, can be assumed; is it correct? Do I have to install a O320 or an O 360 carburetor?
At the time of the engine’s inspection it had 140 hrs since rebuilt.
Thank for any consideration and have the best.
