| Re: [GMCnet] 4.8 MPG [message #324189 is a reply to message #324184] |
Fri, 22 September 2017 09:47   |
emerystora
Messages: 4442
Registered: January 2004
Karma:
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Senior Member |
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Jerry
Apparently you don't know the whole story about this.
Randy has the Howell TBI system with the EBL added on. With the addition of a variable speed sensor one can go into lean cruise mode which allows leaner fuel mixtures. That can only occur at specific conditions such as cruise speed with a high vacuum and a light foot on the gas peddle. As soon as you get a load on the engine the computer enriches the mixture to what you have with a carb.
There is no need to "diagnose on the fly" as the TBI computer does it automatically.
Randy is not the only one doing this. Many, many of us, including me, have been using this system for many years and go to a higher air fuel mixture under certain cruising conditions.
The greater amount of air keeps the engine as cool as a surplus of fuel.
One gets better gas mileage when the system is in cruise mode and no harm is done to the engine. The system includes a screen for your computer display (optional) that shows several things including speed, MPG, vacuum, gallons consumed, and even cylinder temperature if you add a temperature probe. But it goes in and out of lean cruise automatically.
Emery Stora
77 Kingsley
Frederick, CO
> On Sep 22, 2017, at 10:16 AM, Gerald Work wrote:
>
> Hi Rob,
>
> I'm glad it is working for him as he is a good friend and I respect his ability to diagnose on the fly if something were to go wrong at those lean a/f ratios. I doubt that the majority of our owners, including me, could, so I preferred to run both of our coaches richer for the kind of driving we do/did. I will gladly pay a bit more for fuel to avoid having to replace engines.
>
> Larry's findings about a bad canister causing icing on his set up is also interesting for this conversation. Our coaches show so many variations at this ripe young age of 40 that it I find it hard to diagnose much of anything without being hands on. Guess that is why I approached both our GMCs with such conservatism.
>
> Jerry
>
> Jerry Work
> The Dovetail Joint
> Fine furniture designed & hand crafted
> in the 1907 former Masonic Temple building
> in historic Kerby, OR
> http://jerrywork.com
> .........
> Date: Thu, 21 Sep 2017 20:32:00 -0500
> From: "Rob Mueller"
> To:
> Subject: Re: [GMCnet] 4.8 MPG
> Message-ID:
> Content-Type: text/plain; charset="us-ascii"
>
> Jerry,
>
> Randy Van Winkle gave presentation at the Elkhart GMCMI Convention and noted that he runs his coach with EFI at that range
> consistently.
>
> Regards,
> Rob M.
> The Pedantic Mechanic
> Sydney, Australia
> AUS '75 Avion - The Blue Streak TZE365V100428
> USA '75 Avion - Double Trouble TZE365V100426
> USA '77 Kingsley - TZE 267V100808
> ........
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