[Diy_efi] The Hunt effect

Jim Butterfield jimbutterfield
Tue Oct 4 23:32:15 UTC 2005


Hey John ,can I ask the master a question... as you said below the alcohol AFR is 9:1 so 1)does this mean it takes less air to burn... and 2) given  two engines equal, on setup with proper alcohol required fuel delivery, will the ahcohol car get more HP if the pcm/ electronics were tuned for the alcohol????? if so any guess how much HP imporvment???? How does the alcohol act under a bloan application... heat, detnoation-knock etc....
 
thx
jim

John Gross <jogross3 at hotmail.com> wrote:
I'd have to look at the ratios, but yes, certain additives like ethyl
alcohol have an effect on octane ratings. HOWEVER, keep in mind that ANY
alcohol will dry out any rubber seals, o-rings, etc in a fuel system
designed for straight gasoline. Also keep in mind that ethyl alcohol burns
at a stoich AFR of 9:1 (it's an oxygenated fuel), so if you blend it into
gasoline, it will change the required pulse width of your injectors to
maintain the correct lambda. Also, it will tear up your injectors because
they're not designed for alcohol either. That's why you can't just run E85
in an everyday car. The fuel pump, fuel lines, injectors, o-rings, seals,
and even fuel tank liner must be designed to work with alcohol-based fuels.

-----Original Message-----
From: diy_efi-bounces at diy-efi.org [mailto:diy_efi-bounces at diy-efi.org] On
Behalf Of dalemahan at charter.net
Sent: Tuesday, October 04, 2005 4:48 PM
To: diy_efi at diy-efi.org
Subject: Re: RE: [Diy_efi] The Hunt effect

Hi John,

Ah hah - a chance to ask a real IC engineer about fuel questions!


		
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