M20C New engine monitor. ROP and LOP

[mikejr718]

 Trying out the new engine monitor on a recent cross country. Not sure about lean of peak operation, any leaner and it got pretty rough. Trying out the new engine monitor on a recent cross country. Not sure about lean of peak operation, any leaner and it got pretty rough.

 

D799F313-07F1-452C-8260-114318C137DB.MOV826B302B-F16A-4595-A479-C2B7CF0D21F4.MOV

[Greg Ellis]

Others with more knowledge will chime in, but it is difficult to run LOP in a carbureted C model.  The carburetor just does not distribute the fuel well enough to each cylinder.  You will get very rough before ever being far enough lean of peak.  A trick is to introduce some carb heat but for my C model it just does not work well at all.  So ROP it is for me.

[mikejr718]

Can someone confirm the videos posted?

[Janat83]

12 minutes ago, mikejr718 said:

Can someone confirm the videos posted?

I can't see your video!

[mikejr718]

Is there a "How to post video" somewhere on the site? 

[DXB]

14 minutes ago, mikejr718 said:

Is there a "How to post video" somewhere on the site? 

I think you need put on youtube and link to it here. Typically on the M20C you can run at least one cylinder LOP, sometimes two. Cocking the throttle plate slightly if running WOT and adding a touch of carb heat can even out mixture distribution a tad. I've never seen convincing evidence of someone getting all 4 cylinders LOP.  

[M20 Ogler]

I read somewhere not to run a carbureted engine lean of peak because the uneven distribution of fuel to each cylinder in the lean of peak region causes the cylinders to generate uneven power therefore put uneven stress on the crankshaft, idk how accurate that is. I like leaning to best power, because didn’t buy Mooney to go slow

 

[ShuRugal]

My C will only go LoP if i'm running less than 2,000 RPM.  I can get 10-20 degrees LoP there if i really want to.

I can get TO peak at 65% power just fine, though, so that's usually how I cruise.  Since I got the EDM-900, i've actually been playing more with high-power cruise settings, since I now have much better data to know where the engine is with respect to its limits.  

highly recommend watching Mike Busch's webinars with the EAA on Youtube.  He's got a treasure trove of data obtained in test cells using modern testing equipment and sensors.

https://resources.savvyaviation.com/wp-content/uploads/articles_eaa/EAA_2012-12_red-box-red-fin.pdf

Edited October 14, 2021 by ShuRugal

[carusoam]

Post videos in YouTube, copy link here…

 

For optimization running LOP with an O360….  Find the writings of @Hank.

Something akin to this…

1) WOT, minus the amount needed to cut the second fuel jet off….

2) The cocked carb plate aids the mixing…

3) a small amount of carb heat aids the vaporization…

 

Having an engine monitor makes a world of difference…

Did you get carb temp with that?

Great for being in the know regarding carb ice and its elimination…

Best regards,

-a-

[0TreeLemur]

1 hour ago, carusoam said:

Post videos in YouTube, copy link here…

 

For optimization running LOP with an O360….  Find the writings of @Hank.

Something akin to this…

1) WOT, minus the amount needed to cut the second fuel jet off….

2) The cocked carb plate aids the mixing…

3) a small amount of carb heat aids the vaporization…

 

Having an engine monitor makes a world of difference…

Did you get carb temp with that?

Great for being in the know regarding carb ice and its elimination…

Best regards,

-a-

FAQ worthy