PE-2 35 question

[Herne]

There are 2 gauges at the top of the instrument panel with an A symbol in them. 

They appear to be related to fuel mixture and altitude. I try to keep them at about 0.8 but I have no idea what they really are or what they are measuring. I don't even know what they are called otherwise I might be able to look it up.

 

Does anyone know what they are and where I should aim to try and keep the needles ?

[Alexmarine]

It should be a fuel/air ratio indicator with optimal value at 0.9

 

Values less than it are for a rich mixture while values over it are for a lean mixture

[Herne]

thanks, so is it fair to assume that 0.9 would give the most power output ?

[Finkeren]

Does that work for all altitudes? That would be a really useful tool when setting mixture.

[Alexmarine]

I think so Fink. I just know what it is and what it shows. I'll test it this night to see if it works like that

[Herne]

Does that work for all altitudes? That would be a really useful tool when setting mixture.

 

I did notice as I climbed the readings got lower, but adjusting mixture I could keep the readings at 0.8, even though I wasn't entirely sure what I was doing.

 

I agree it seems incredibly useful.

[Alexmarine]

I did notice as I climbed the readings got lower, but adjusting mixture I could keep the readings at 0.8, even though I wasn't entirely sure what I was doing.

 

I agree it seems incredibly useful.

Then it really works. As you climbed the mixture you had set was becoming rich for the altitude you were reaching and so the value shown started to decrease. Really usefull instrument indeed.

[Herne]

I found this wiki page which explains fuel air mixture in some detail. I enjoyed it right up to the maths equations lol. 

posting the link here in case anyone is interested :-

https://en.wikipedia.org/wiki/Air%E2%80%93fuel_ratio

 

What I didn't realise was, that its kinder to the engine to run slightly rich

[JimTM]

I found this wiki page which explains fuel air mixture in some detail. I enjoyed it right up to the maths equations lol. 

 

posting the link here in case anyone is interested :-

 

https://en.wikipedia.org/wiki/Air%E2%80%93fuel_ratio

 

What I didn't realise was, that its kinder to the engine to run slightly rich

 

I think that the meters are displaying "Air–fuel equivalence ratio (λ)" from the page that you referenced. However, I'm not sure why the meters are labeled with an alpha symbol rather than the lamda symbol.

Edited September 6, 2017 by JimTM