[AT] GM Flex Fuel vehicles

[Jason DeJoode]

Ethanol is more corrosive than gasoline.  So the other change is a more 
corrosion resistant fuel system:  fuel lines, injectors, maybe the gas tank 
depending upon the standard edition's construction.  Of course there are 
likely other changes to the computerized engine controls.

Jason
Eagan, MN



----- Original Message ----- 
From: "charlie hill" <chill8 at cox.net>
To: "Antique tractor email discussion group" <at at lists.antique-tractor.com>
Sent: Monday, July 31, 2006 2:29 PM
Subject: Re: [AT] GM Flex Fuel vehicles


> Ask the service manager at MY dealer?  LMAO  you mean the one that told me 
> "that's not condensation.... that's moisture".   Yeah right.  He'd be a 
> lot of help.
>
> Yeah I'm pretty sure you'd need larger injectors (more flow).  I just 
> wondered about cam grinds, cyl head design, valve size, cut etc.  Since 
> ethanol burns cooler than gasoline (due to higher fluid volume per btu) I 
> wonder if there are cooling system changes.  Lots of things to consider.
>
> Charlie
> ----- Original Message ----- 
> From: <pga2 at hot1.net>
> To: "Antique tractor email discussion group" 
> <at at lists.antique-tractor.com>
> Sent: Monday, July 31, 2006 2:03 PM
> Subject: Re: [AT] GM Flex Fuel vehicles
>
>
>> Charlie,
>> My suspicion is that the computer has a different load in it, mainly to
>> keep the injectors open about 20% longer than the gas version. The only
>> other thing i could possibly envision is that the injectors are a
>> different rating (lbs. of fuel/hour). The need is there since E85 
>> doesen't
>> have as many BTU/gal. as gasoline, much like propane. I sure would be
>> interested in finding out for sure.
>> You might want to ask the service manager at your dealer if he can tell 
>> you.
>>
>> Phil
>>
>>> I have a question for the resident GM experts.
>>>
>>> I have a 2006 GMC sierra pickup.  That same truck and same engine are
>>> available in a Flex Fuel (E85) version.   I have no plan on trying to
>>> switch
>>> mine but I'm curious about the mechanical differences in the two 
>>> engines.
>>> Obviously the computers are set up different but does anyone know what
>>> else
>>> is different about them?
>>>
>>> Seems to me that since GM makes them both ways it should be possible to
>>> change the gas setup to flex fuel with off the shelf parts.
>>> It would probably cost too much and right now it wouldn't make much 
>>> sense
>>> to
>>> do it anyway.  I'm just curious about the process.
>>>
>>> Charlie
>>>
>>
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