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Continental TSIO-520-R Fuel Flow questions

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Continental TSIO-520-R Fuel Flow questions

Old 5th Mar 2019, 17:31
  #1 (permalink)  
Thread Starter
Join Date: Apr 2014
Location: Italy
Posts: 13
Continental TSIO-520-R Fuel Flow questions


In the Turbo Centurion checklist, the recommended climb power settings are:
  • 30 MAP
  • 2500RPM
  • FF Lean to 120lbs/hr
On a side note, I see that on hot weather the FF may not reach 120lbs/hr with a full rich mixture, therefore you have to turn on the fuel pump to increase FF, then lean to 120lbs/hr.
Why is the temperature affecting FF in this case?

I know that TCM continuous flow system simply delivers a certain amount of fuel given the throttle position. No MAP or other parameters are taken into account.

Is it correct to state that with a TSIO-520-R, the FF will stay constant during a climb and no mixture change is virtually needed with altitude change (given the same MAP/RPM settings) since the turbo will keep the air pressure constant throughout the climb?

Thanks! :-)
nico87 is offline  
Old 6th Mar 2019, 12:18
  #2 (permalink)  
Join Date: Mar 2008
Location: Lander, WY, USA
Posts: 119
It's been a few years since I was flying a turbo 210 (or a C340, essentially the same engine x2), but, offhand, 120lbs/hr seems too lean for climb, though maybe not for 30". In general, you're right, the mixture should not have to be adjusted during climb. Temperature-wise, I do recall having to have the mechanics tweak fuel flow with seasonal temperature change, as in, winter setting would not be just right once warmer summer temps came on, and vice-versa.
I believe the entire setup procedure is in this (very extensive!) service directive from Continental, SID 97-3G. A google search will turn up pdf files for this bulletin.
Not sure any of this will help, as I said, it's been a few years for me.
340drvr is offline  
Old 6th Mar 2019, 18:13
  #3 (permalink)  
Thread Starter
Join Date: Apr 2014
Location: Italy
Posts: 13
Thanks! Your answer is really appreciated and it shed some lights on my questions.
nico87 is offline  
Old 6th Mar 2019, 18:35
  #4 (permalink)  
Join Date: Jul 2001
Location: Belgium
Posts: 485
You should watch the CHTs during climb. If they remain constant, your fuel flow is good, if they rise, you need more FF.
dirkdj is offline  

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