Straight from the mouths of Lycoming, here we go!
1. Prefixes
AE - Aerobatic (wet sump)
H - Horizontal Helicopter
I - Fuel Injected
L - Left Hand Rotation Crankshaft
O - Opposed Cylinders
T - Turbocharged
2. Cylinder Cubic Inch Displacement
Cubic Inch Displacement No of Cylinders
235, 320, 360 4
540, 580 6
720 8
3. Suffixes
L - Indicates change in Power Section and
Rating from Original Design
1 - Indicates Nose Section
B - Indicates Accessory Section
5 - Indicates Counterweight Application
Hope that helps.
"Some days you are the pigeon, some days you are the statue!!"
(Just investigated the Lycoming web-site further and found engines with different coding to the above! Eh????)
[ 28 November 2001: Message edited by: HeliEng ]