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  #1  
Old 11-12-2014, 12:10 AM
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Dbro172 Dbro172 is offline
 
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Default What would you do with this?

My throttle produces severely offset CHTs and EGTs at about a 75% position. If I dump in full throttle or pull back to 65% or less all the numbers even out nicely though. I've verified I can get a good EGT rise at altitude by leaning. But this spot around 75% has some wicked offsets. Aerosprort was of little help.


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Last edited by Dbro172 : 11-12-2014 at 10:44 AM.
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  #2  
Old 11-12-2014, 01:21 AM
Jordan1976 Jordan1976 is offline
 
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Default

I'd lean the engine out. 11.7 GPH on an O320 is a ton of fuel at 72% power on an O320. It's enough to support almost 170 HP, and you're producing about 115.

Does it clean up when you drop to 10-ish GPH, which is much more in line with a ROP mixture at that power?

What do your fuel flows look like at WOT and 65% power?

--Ian
Dynon Avionics
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  #3  
Old 11-12-2014, 01:39 AM
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Default

I will have to lean it out and check to respond to your question but I think it has more to do with the butterfly valve setting. I can check fuel flow at wot and 65% power but that will pry mean climbing to 12500 da or so?

I think I'm realizing some significant ram air horsepower or some significant horsepower increase from the ASA vacuum valve because whereas I only get 2150 rpm static at 1500 msl, I can still wind it up to 2750 at 10,000 DA.
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  #4  
Old 11-12-2014, 06:04 AM
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Steve Melton Steve Melton is offline
 
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Default sump riser insert

do you have a sump riser insert? lycoming SB-258.
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  #5  
Old 11-12-2014, 08:05 AM
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LifeofReiley LifeofReiley is offline
 
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Quote:
Originally Posted by Steve Melton View Post
do you have a sump riser insert? lycoming SB-258.
Extremely old SB and it looks like he has a Superior 320. Lean for the altitude and report back, that's a lot of fuel burn.
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  #6  
Old 11-12-2014, 08:28 AM
Rupester Rupester is offline
 
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Default Agree with the leaning recommendation

I have likely the same engine in a 9A - Superior IO-320 - furnished by Aerosport Power. At that altitude and at 72% power I'd be leaned w-a-y back and burning 6.5gph or less. Even at <4000 ft running 75% and 100 ROP my fuel burn is ~ 9 to 9.3gph. That 11.7 - as others have observed - is WAY high.
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  #7  
Old 11-12-2014, 10:21 AM
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Danny King Danny King is offline
 
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Default RPM 2690

I take it that you have a fixed pitch propeller. A sweet spot at nearly 2700 RPM?
If you had a constant speed prop, you could set around 23/23, lean to around 6-7 GPH and watch things quiet down and cool off.
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Last edited by Danny King : 11-12-2014 at 10:25 AM.
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  #8  
Old 11-12-2014, 10:24 AM
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Dbro172 Dbro172 is offline
 
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Here is a photo and my sump riser (spacer) that was asked about previously. Perhaps it should be above the throttle bracket?

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  #9  
Old 11-12-2014, 10:37 AM
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LifeofReiley LifeofReiley is offline
 
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Quote:
Originally Posted by Dbro172 View Post
Here is a photo and my sump riser (spacer) that was asked about previously. Perhaps it should be above the throttle bracket?

Yes... and mounted inside the bottom of the sump. You have a Superior Engine, not going to be your issue.
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  #10  
Old 11-12-2014, 10:53 AM
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Dbro172 Dbro172 is offline
 
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Reiley - can you clarify your response? are you saying the brown spacer should be above the white throttle bracket?
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RV-9A #92103 - N803DK
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www.mykitlog.com/dbro172/

1974 Bellanca Super Viking - N16AW - Flying
RV-8 #83565 - N184DK - building
1968 Mooney M20C - N6801N - Sold
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