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  #1  
Old 01-30-2020, 12:24 PM
TXFlyGuy TXFlyGuy is offline
 
Join Date: May 2012
Location: Jazz Town, USA, TX
Posts: 437
Default Specific Fuel Consumption

What is the BSFC of a Lycoming or Continental engine?

Just for comparison, my V8 is between .40 and .50, with an average burn of .45.

Here are the latest numbers from the dyno runs...

4000 rpm:
24 inches = 345tq 260hp 19.5 gph
22 inches = 324tq 246hp 18.7 gph
21 inches = 303tq 235hp 16.2 gph

3500 rpm:
24 inches = 335tq 220hp 16.5 gph

From 4000 to 3500 the torque values are about the same but the hp drops about 40.

This comes in right at .45 lbs / hp / hr. Right on schedule for a high performance V8.
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  #2  
Old 01-30-2020, 12:34 PM
Grum.man Grum.man is offline
 
Join Date: Aug 2014
Location: Statesville, NC
Posts: 27
Default

The IO-550 line gets around .37-.38 LOP at 75%
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  #3  
Old 01-30-2020, 12:50 PM
TXFlyGuy TXFlyGuy is offline
 
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Location: Jazz Town, USA, TX
Posts: 437
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Quote:
Originally Posted by Grum.man View Post
The IO-550 line gets around .37-.38 LOP at 75%
What is the hp/torque at 75% power? RPM / Manifold Pressure?

Is that pounds per hour per horsepower? If so, those are awesome numbers. We will not run LOP.
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Old 01-30-2020, 12:56 PM
Grum.man Grum.man is offline
 
Join Date: Aug 2014
Location: Statesville, NC
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Quote:
Originally Posted by TXFlyGuy View Post
What is the hp/torque at 75% power? RPM / Manifold Pressure?

Is that pounds per hour per horsepower? If so, those are awesome numbers. We will not run LOP.
232 HP for an IO-550N. Fuel flow at 75% best econ is 88-90 lbs per hour. TQ isn't specified but calculated should be about 488 lb-ft

The IO-550G is better but is only 210 HP.
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  #5  
Old 01-30-2020, 01:50 PM
TXFlyGuy TXFlyGuy is offline
 
Join Date: May 2012
Location: Jazz Town, USA, TX
Posts: 437
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Quote:
Originally Posted by Grum.man View Post
232 HP for an IO-550N. Fuel flow at 75% best econ is 88-90 lbs per hour. TQ isn't specified but calculated should be about 488 lb-ft

The IO-550G is better but is only 210 HP.
Impressive numbers, nearing diesel fuel burns. My numbers in the first post are at full rich (I think). I doubt that any leaning was done during the dyno runs.
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