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  #21  
Old 11-03-2022, 12:49 PM
hoyden hoyden is offline
 
Join Date: Jul 2011
Location: Minneapolis, MN
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Originally Posted by lr172 View Post
That is WAY more fuel than necessary for a 320. There are many other options to keep an engine cool other than throwing excessive fuel at it.
A couple weeks ago I was up to Aero Sport Power to build my IO-320. I witnessed the engine test where they ran my engine for a total of 1 hour 20 minutes in 3 test runs at 2620 rpm and 27". Fuel flow was 16.4 to 16.6 gph. CHT was 310-330F. My RV-6 IO-360 flows 17.5-18.2 gph WOT. Ballpark fuel flow of HP / 10. I'm happy burning some extra fuel to keep CHTs below 400.
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  #22  
Old 11-03-2022, 02:06 PM
lr172 lr172 is offline
 
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Originally Posted by hoyden View Post
A couple weeks ago I was up to Aero Sport Power to build my IO-320. I witnessed the engine test where they ran my engine for a total of 1 hour 20 minutes in 3 test runs at 2620 rpm and 27". Fuel flow was 16.4 to 16.6 gph. CHT was 310-330F. My RV-6 IO-360 flows 17.5-18.2 gph WOT. Ballpark fuel flow of HP / 10. I'm happy burning some extra fuel to keep CHTs below 400.
That seems like a lot. My 540 only takes 24-25 GPH 29/2700 and relatively that would be 16 or so for a 360 and 14.5 for a 320. I guess I wasn't thiking of a CS prop that turns 2700. I don't get much over 2500 down low with my FP and why I see mid 13's.
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  #23  
Old 11-03-2022, 04:53 PM
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RV8JD RV8JD is offline
 
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Originally Posted by hoyden View Post
A couple weeks ago I was up to Aero Sport Power to build my IO-320. I witnessed the engine test where they ran my engine for a total of 1 hour 20 minutes in 3 test runs at 2620 rpm and 27". Fuel flow was 16.4 to 16.6 gph. CHT was 310-330F. My RV-6 IO-360 flows 17.5-18.2 gph WOT. Ballpark fuel flow of HP / 10. I'm happy burning some extra fuel to keep CHTs below 400.
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Originally Posted by lr172 View Post
That seems like a lot. My 540 only takes 24-25 GPH 29/2700 and relatively that would be 16 or so for a 360 and 14.5 for a 320. I guess I wasn't thiking of a CS prop that turns 2700. I don't get much over 2500 down low with my FP and why I see mid 13's.
Here is my 180 HP Lyc IO-360-M1B with the AvStar FI, Hartzell BA CS prop, DA=248', full rich, just after TO. Flows 17.1 GPH +/-. Seems about right per the Lyc charts.

The 160 HP Lyc IO-320 operator's manual states rated power, full rich limits as 13.8 to 15.2 GPH.
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Last edited by RV8JD : 11-03-2022 at 05:08 PM.
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  #24  
Old 11-03-2022, 05:40 PM
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MacCool MacCool is offline
 
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When I finish my RV-9 with an IO-320 I will be expecting to see fuel flows no less than 15 GPH.
Yikes! Iíve never seen fuel flow that high on my IO320D1A in any circumstance, nor can I recall seeing CHTs higher than 400 degrees.
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  #25  
Old 11-04-2022, 08:53 AM
lr172 lr172 is offline
 
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Yikes! I’ve never seen fuel flow that high on my IO320D1A in any circumstance, nor can I recall seeing CHTs higher than 400 degrees.
Me either. That is why I was so surprised when he posted it. Chart in Lyc operators manual for 320 (160 HP) says 14.5 GPH at 29/2700 at SL; Pretty much what I estimated in my post above. They tend to be pretty conservative so not sure why you would throw more fuel at it. THey also say 10 GPH at 75% power and from my experience ROP at 75% power is a closer to 9. I tend to be only 150 ROP on the rich side and never see 400 CHTs down low. Above 8K is a different story, as the ignition keeps advancing and raises CHTs.

Larry
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Last edited by lr172 : 11-04-2022 at 09:20 AM.
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