Altitude Compensation - Fuel Mixture

I'm new to this forum and new to Viking Engines. I'm early in my research.

 

My question is: Does a Viking 130 engine reduce the fuel rate automatically through the ECU as altitude increases - to lean out the mixture?

 

If so, is there an altitude limit - where no further leaning is conducted?

 

Thanks to all,

 

Bill

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Replies

  • Yes, it does that and there is no altitude limit for this
    • Thanks! I have another newbie question. Since the Viking engine is built to automotive tolerances regarding piston to cylinder clearance - is preheating required in cold weather?
    • Only if you would like to do so. The engine will start and warm up on its own.
  • Thanks. How about the Turbo 195 - does it lean with altitude like the 130?

    Bill
    • The modern engines do not care what altitude they are at. The engines do not “know” what altitude they are at. They do not need this information.

      The engine “Know” what the temperature and manifold pressure is. From this, the correct amount of fuel can be calculated.

      So, yes, any temperature/ any altitude
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Viking Aircraft Engines replied to William Batten's discussion Altitude Compensation - Fuel Mixture
"The modern engines do not care what altitude they are at. The engines do not “know” what altitude they are at. They do not need this information.

The engine “Know” what the temperature and manifold pressure is. From this, the correct amount of…"
Jan 23
William Batten replied to William Batten's discussion Altitude Compensation - Fuel Mixture
"Thanks. How about the Turbo 195 - does it lean with altitude like the 130?

Bill"
Jan 23
Viking Aircraft Engines replied to William Batten's discussion Altitude Compensation - Fuel Mixture
"Only if you would like to do so. The engine will start and warm up on its own."
Jan 23
William Batten replied to William Batten's discussion Altitude Compensation - Fuel Mixture
"Thanks! I have another newbie question. Since the Viking engine is built to automotive tolerances regarding piston to cylinder clearance - is preheating required in cold weather?"
Jan 23
Jose P M Almeida replied to bob noffs's discussion fuel for 110
"Hi Bob. Yes you are right. The manual says maximum of 15% but all auto gas here in Brazil has 25% or 27% ethanol. Since I am monitoring closely and I had no issues with 90 hours of flight and it is a very clean fuel, the only concern would be the…"
Jan 7
bob noffs replied to bob noffs's discussion fuel for 110
"thanks jose. isn't 25% a little high for this engine?"
Jan 7
Jose P M Almeida replied to bob noffs's discussion fuel for 110
"Hi Bob. My 110 engine has 90hs. I use auto gasoline here in Brazil with 25% ethanol. It has 95 octane. I used 100 LL only once just to test. Saw no noticable difference."
Jan 6
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