[Diy_efi] (no subject)

[Torbjörn Forsman]

It is definitively no problem to use E85 (at least the E85 fuel 
available in Sweden) in old carbureted cars.
Usually, the conversion is just a matter of changing to bigger main 
jets. An area increase of about 30 %, i.e. a diameter increase of 15 % , 
will often work well.
To get good fuel economy, the ignition timing can be adjusted somewhat 
(typically 5-7 degrees) earlier than for gasoline.
Furthermore, it is important to have good intake air preheating. On old 
cars with a hand operated preheating flap, it can usually be left in the 
"winter" position all year around. In case of thermostat controlled 
preheating, make sure that it operates as intended and, if possible, try 
to adjust the thermostat for a higher temperature than usual.

On an old car, there is often much gum residue from gasoline in the fuel 
system. This residue will dissolve in E85 and may then clog the fuel 
filter(s). It is common to have to replace the fuel filter and possibly 
clean the carb several times during the first months on E85. Don't 
forget the filters that might be integrated in the tank armature, fuel 
pump and carb!
Old, brittle fuel hoses might become leaky when the gum deposits are 
washed away (perhaps the rubber is so porous that the gum was necessary 
for sealing).


Best regards

Torbj?rn Forsman

Frederick Trient wrote:
> Hello out there.
> I'm brand new to the list so I hope my questions won't be too basic  for 
> any of you. The rising price of gas has made me think of  improving the 
> mpg for my '65 El Camino. At about 11 mpg with an  Edelbrock 4 barrel 
> carb it's getting pretty expensive to drive.  Another reason for me to 
> consider f.i. is the possibility of E85 gas  becoming available. I'm 
> going on the assumption that fuel injection  is necessary to burn the 
> E85 stuff. Is that correct? If so, it seems  that it would be possible 
> to switch, on the fly, from mapping for  straight unleaded gas to 
> mapping for E85 with a box somewhere on the  dashboard. I'm thinking 
> that it would be necessary to have different  mapping for each type of 
> fuel.
> Would appreciate any feedback you guys could give me.
> TIA,
> Fred
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