[AT] GM Flex Fuel vehicles

[charlie hill]

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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