Username Protected wrote:
Frank
The engine in the Bravo is actually a 310 hp engine derated to 270.
So that’s not as high a setting as you would expect.
And FWIW in both the 252 and the Bravo we had to top the engines at around 1000 hours
There are TIO-540’s at 350/360 but I’m not sure that the Bravo is a derated version. Maybe more like an uprated version ?
The AF1A being an AF1B after the wet head mod = Bravo engine.
Model/HP/Max RPM/Fuel/Compression/Description
O-540-ALA 250/235 2575/2400 100/100LL 8.50:1 Two sixth order counterweights
(not sure about the origin here - couldn't find an A1A, ALA is the closest)
O-540-A1A5 250/235 2575/2400 100/100LL 8.50:1 Same as O-540-A1A but one fifth and one sixth order counterweights
O-540-A1B5 250/235 2575/2400 100/100LL 8.50:1 Same as -A1A5 except for short propeller governor studs and two impulse magnetos
O-540-A1D5 250/235 2575/2400 100/100LL 8.50:1 Same as -A1B5 except for Retard Breaker Magnetos
IO-540-C1B5 250 2575 100/100LL 8.50:1 Same as O-540-A1D5 but with Bendix fuel injector
IO-540-C4B5 250 2575 100/100LL 8.50:1 Same as -C1B5 but with more effective counterweights for use with Hartzell "compact,, propeller
IO-540-J4A5 250 2575 100/100LL 8.50:1 Same as -C4B5 except comersion for use with turbo- charger, long reach spark plugs, piston cooling oil jets, AN fuel pump drive, vented fuel nozzles and -1200 series Magnetos
TIO-540-C1A 250 2575 100/100LL 7.20:1 IO-540-J4A5 equipped with TE0659 turbocharger and low compression pistons
TIO-540-K1AD 250 2575 100/100LL 8.00:1 Similar to -CIA but with D6LN-3200 retard breaker dual magneto, pressure controller, provision for cabin pressurization, rear mounted fuel injector, turbocharger mounted to rear of engine and higher C.R.
TIO-540-AA1AD 270 2575 100/100LL 8.00:1 Similar to -K1AD but has a different controller system and has provision for a rear mounted propeller governor
TIO-540-AF1A 270 2575 100/100LL 8.00:1 Similar to -AA1AD but has Slick magnetos, different turbocharger and an intercooler
Info from:
http://www.meyette.us/LycomingEngineNumbers.htm