try this, CAnt Quite remember them fully but im shure someone will put me right!!:-
Example: TIO 540 E1B4D
PREFIX
L - Lefthand Engine Rot.
T - Turbocharged
V - Vertical Helicopter
H - Horizontal Helicopter
A - Aerobatic
I - Fuel Injected
G - Geared Nose Section
S - Supercharged
O - Opposed Cylinder
Middle 3 Numbers are Cubic Inches
SUFFIX
E - Power Section & Rating
1 - Nose Section
B - Accessory Section
4 - Counterweight Applic.
D - Dual Magneto
[ 28 November 2001: Message edited by: 100LL ]