DIY_EFI Digest V5 #112

[Swayze]

got a chance to look at the book, seems this % alcohol sensor sends temperature and density signals to the ECM. works for ethanol and methanol. the way its drawn in the manual looks like a capacitor. has a paragraph on using a 'Tech 1 scan tool to determine percent methanol in the fuel,but really just mix with known volume of water as water an alcohol are mixable. 'M85' fuel--85%methanol,15%unleaded. a few paragraphs in there on formaldehyde as a byproduct. offhand anybody know the relative densities of unleaded,methanol and ethanol  (vs. water).

another question-- is methanol(ethanol) a significant knock deterrent?

byE
Mike
Swayze
mswayze at truswood.com
kswayze at bellsouth.net

............
> >Subject: Re: Subject: Re: water into efi system before injectors.
> >
> >I have a manual on the dual fuel 90-91 lumina, seems it had some sort of 
> >sensor on the fuel line to determine the percentage of alchohol in the 
> >fuel. any idea how it would work?
> >byE
> >Mike
> >Swayze
.......

> production.  Fuzzy recollection says it was done with a light beam and a 
> sensor that measured the light refraction, don't know if it went in to 
> production that way or it was just an idea that they were working with.
> 
>                          Todd Israels
.....

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