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  #1  
Old 04-14-2022, 10:21 AM
Fenderbean Fenderbean is offline
 
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Location: Huntsville AL
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Default Trying to educate and understand

Turbos and lean of peak, I didn't think turbos would prevent lean of peak. Is this a correct train of thought? This particular conversation was around an IO-540 with turbos on an airplane that traditionally has the Cont 550 with turbos. I guess the 550 you can do this with turbos vs the IO?

Last edited by Fenderbean : 04-14-2022 at 11:23 AM.
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  #2  
Old 04-14-2022, 02:23 PM
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Foghorn Foghorn is online now
 
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Turbos can run great LOP. Having balanced fuel injection, no induction leaks and an engine monitor (for each cylinder) is the key. Turbos can also be on carbureted engines not just injected engines, which are designated IO (Injected, horizontally Opposed). Carbureted engine donít normally run LOP as well as IO engines.

I had a P210N for 5 years. It has a TSIO-520 engine (T for turbo charged). My normal cruise numbers were 30í MP, 2500 RPM and 30*-40* LOP ON 16 gph with hottest CHT around 380. Iíd see 185 ktas at 17,500. It ran great and I miss it to this day!
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  #3  
Old 04-14-2022, 05:46 PM
Fenderbean Fenderbean is offline
 
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looking into something that has a 540 twin turbo on it, seems to be a thirsty combo from what I was told. 22-24 gph. I couldnt understand if that was throttled back 65-75% or fuel throttle. The conversation was comparing it to a twin turbo 550, lean of peak was around 16 gph. I understand the 550 is better on gas but thats a bid difference.
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  #4  
Old 04-14-2022, 07:46 PM
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The P210N fuel flow at full throttle was 36 GPH. Running 22-24 GPH with a twin turbo 540 is probably 80*-100* ROP.
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  #5  
Old 04-15-2022, 07:09 AM
David Z David Z is offline
 
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I flew Navajos for a while. Nothing fancy, old instruments, but decent airplanes. Turbo angle valve TIO-540 rated at 350hp running ROP at 65% (31", 2200rpm) burned 17gph each. This was about 100į ROP.

We'd flight plan 300lbs/hr climb and 200lbs/hr cruise and that seemed slightly generous. That's for two engines too
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  #6  
Old 04-15-2022, 10:37 AM
Fenderbean Fenderbean is offline
 
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This is to help me decide on a project that comes with a 540 with twin turbos is why im asking. Its on a lancair but the motor has an hour of run time and I just didnt want crazy fuel burn on something that just hauls 4 people and not pressurized. Someone gave me some information that I think may have been a bit biased with 550s
That being said could this information be from a high altitude prospective? I not sure the exact numbers but these type of motors lose 40+% of there power at 15-20k alt
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  #7  
Old 04-15-2022, 11:34 AM
Ralph Inkster Ralph Inkster is offline
 
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Pretty easy to download the Lycoming Operators Manual for these engines
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  #8  
Old 04-15-2022, 01:07 PM
Fenderbean Fenderbean is offline
 
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Quote:
Originally Posted by Ralph Inkster View Post
Pretty easy to download the Lycoming Operators Manual for these engines
trying to find on their website, the picture isnt viewable when clicked

Last edited by Fenderbean : 04-15-2022 at 01:17 PM.
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  #9  
Old 04-15-2022, 03:36 PM
Ralph Inkster Ralph Inkster is offline
 
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Just Google:

Lycoming DOCUMENT PART NO. 60297-23P for TIO-540 Parallel Valve

or

Lycoming DOCUMENT PART NO. 60297-23A for TIO-540 Angle Valve
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Last edited by Ralph Inkster : 04-15-2022 at 03:39 PM.
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  #10  
Old 04-17-2022, 08:41 PM
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Turbos don't like enormously high EGT's feeding the turbine side - so stay ROP or LOP - but not AT peak.
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