Gary.A.Sobek
Joined: 09 Jan 2006
Posts: 217
Location: SoCAL USA
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 Posted: Fri Jan 29, 2010 7:33 pm Post subject: Input Needed on Engine Selection: 0-320 vs. 0-360?, which |
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I have been flying my RV-6 with O-320 for the past 12-years. I have a parallel valve 360 core sitting in my hangar that I plan to built up as an IO-360 Constant Speed prop when I get around to it.
I am putting the 180 HP FI in when I get around to it because I did not do it when I built the airplane.
12+ years flying all over North America most of the time with other RVs has shown me that the 360 will use less fuel than the 320 when flying the same cruise speeds and will go FASTER than the 320 when you wish to burn more fuel. Using the data from the FAA TCDS for both Lycoming engines shows that there is only 10 pounds difference in weight between the 320 and 360. An increase in 10 pounds to gain 20 HP and less pounds of fuel per HP produced sounds good to me. IF you look at the TCDS for the Superior Vantage 360 C it has the same bore C stroke C and compression as the Lycoming and it was certificated on auto fuel and 100 LL.
SEE TCDS E00001SC for info on the Superior Air Parts engine.
--- insert from E00001SC ---
Motor Gasoline (R+M/2) (See Note 7)
ASTM D4814 C Min Octane 91 (no alcohol)
--- snip ---
NOTE 7. .
Experience has shown that there is a higher probability of vapor locking on aircraft C especially on those equipped with fuel injected reciprocating engines when operating with high volatility fuels such as motor gasoline. Aircraft fuel system designs for the powerplant installation of these engines may need to incorporate special design features or enhanced cooling to accommodate operation with high volatility fuels such as motor gasoline. The aircraft fuel system hot weather testing requirements of FAR 23.961 must be successfully accomplished for each aircraft powerplant installation design of these engines (both carbureted and fuel injected) to obtain approval for operation with motor gasoline.(Ref: AC 23.1521-1B).
...END...
--- end insert from E00001SC ---
The Parallel valve 360 is the way to go. There is not much difference in NEW price of fuel injection vs carb or 320 vs 360 but the electric boost pump does cost more for the FI engine. Both the Carb and FI can run LEAN OF PEAK but the FI can run leaner of peak than the carb. Leaner of peak will be lower fuel flow but from experience I can say for a fact that lower fuel flow means lower air speed. You need the fuel to make the HP and get the speed. Not such thing as free HP.
Gary A. Sobek
"My Sanity" RV-6 N157GS O-320 Hartzell C
2 C241+ Flying Hours So. CA C USA
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