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  #11  
Old 04-01-2019, 10:51 PM
RFSchaller RFSchaller is offline
 
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Location: Phoenix, AZ
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The way I remember the K-factor adjustment equation is to think of the K as the number of turbine revolutions per gallon. If your calculated fuel used is high you need to increase the number of revolutions per gallon and increase K.
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  #12  
Old 04-02-2019, 08:07 AM
DHeal DHeal is offline
 
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Bill -- We are talking about an RV-12 here not an RV-7 type of aircraft. The RV-12 has a bypass/return form of fuel system with only one fuel flow sensor so the stock K Factor needs to be adjusted to reflect the bypassed fuel.
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  #13  
Old 04-02-2019, 12:48 PM
Tacco Tacco is offline
 
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Thanks guys. I?m going to set the K-Factor at 110000 for my next flight (a couple days from now) and let you know.
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  #14  
Old 04-02-2019, 06:35 PM
BillL BillL is offline
 
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Quote:
Originally Posted by DHeal View Post
Bill -- We are talking about an RV-12 here not an RV-7 type of aircraft. The RV-12 has a bypass/return form of fuel system with only one fuel flow sensor so the stock K Factor needs to be adjusted to reflect the bypassed fuel.
Thanks - I did not know that - I have deleted the post as it is not relevant.
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  #15  
Old 05-04-2019, 12:22 PM
Tacco Tacco is offline
 
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Just to follow up: my setting seemed to settle out about 110000.
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  #16  
Old 05-19-2021, 05:02 PM
seagull seagull is offline
 
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Instead of starting a new post I am reviving this one since it has some good information on calibrating the K-factor.

On my Dynon I show;
PUL/GAL (C37 P14) 100000
PUL/GAL (C37 P19) 100000

Are both of these numbers important or only one?
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  #17  
Old 05-19-2021, 06:53 PM
seagull seagull is offline
 
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You have a sensor on your return line?
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  #18  
Old 05-19-2021, 07:20 PM
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Tony_T Tony_T is offline
 
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Quote:
Originally Posted by seagull View Post
Instead of starting a new post I am reviving this one since it has some good information on calibrating the K-factor.

On my Dynon I show;
PUL/GAL (C37 P14) 100000
PUL/GAL (C37 P19) 100000

Are both of these numbers important or only one?
C37 P14 refers to the EMS 37 pin connector and P14 is the red cube flow from the fuel tank.
C37 P19 is for return flow, but the RV12 has no return flow transducer so there is no connection to that pin. You can confirm that on the Van's SV wiring diagram if you wish. I am not to sure what SV does with the number you might put into the P19 setting.



It does appear though that if there are no transducer pulses on pin 19, then there should be no effect on fuel flow no matter what "K-factor" number you put in the settings for Pin 19.



Things might work differently on the D180 because as I remember a few of us using that EFIS could simulate return flow using the return flow K-factor. We were able to set indicated fuel flow on the EMS page to zero with the engine off and the fuel pump running. We resorted to that because the D180 limited the top adjustment of the red cube K-factor to 99,999 and we needed it to be higher. By adjusting the return flow K-factor we could use a number less than 99,999. This is all from memory a long time ago I no longer have a D180 panel so can't verify that.

I hope I have not strayed to far afield for this thread.
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Last edited by Tony_T : 05-19-2021 at 08:16 PM.
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  #19  
Old 05-19-2021, 08:06 PM
seagull seagull is offline
 
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Quote:
Originally Posted by Tony_T View Post
C37 P14 refers to the EMS 37 pin connector and P14 is the red cube flow from the fuel tank.
C37 P19 is for return flow, but the RV12 has no return flow transducer so there is no connection to that pin. You can confirm that on the Van's SV wiring diagram if you wish. I am not to sure what SV does with the number you might put into the P19 setting.
This is what I was thinking. Is there a reason to have a value in the C37 P19 position or does the number I put there affect anything?
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  #20  
Old 05-20-2021, 12:53 AM
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Felix1973 Felix1973 is offline
 
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In my RV12 with a 912 ULS I am using 98450 as K factor. That’s purposely a tiny bit more than what I am actually using since I never want to see more fuel on the display than what is actually in the tank.
Every time I am on the ground, I am adjusting it to the measured in tank value (engine/fuel/match/accept).

Last edited by Felix1973 : 05-20-2021 at 12:58 AM.
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