| Re: [GMCnet] 4.8 MPG. [message #324104 is a reply to message #324103] |
Thu, 21 September 2017 09:18   |
James Hupy
Messages: 6806
Registered: May 2010
Karma:
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Senior Member |
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You can go a whole bunch of directions with egt. Full meal deal says probes
at each exhaust port, placement is critical. Or downstream a bit where
there is one stream per side, kinda like a O2 sensor or a cat converter.
The lab rats here, of which there are a few good ones, will quote you
chapter and verse on this process. In any case, it ain't always what it
seems. By the time a simple system senses a high temperature, significant
damage might have already happened. But a complex system requires
interpretation that also might use up too much time to react. Takes a well
programmed computer to keep up with modifying the injector pulse width or
length, as well as ratcheting back ignition timing soon enough. Randy Van
Winkle and George have had first hand experience with lean cruise. Listen
to what they say. They learned first hand about it.
Jim Hupy
Salem, Or
78 GMC ROYALE 403
On Sep 21, 2017 6:56 AM, "Keith V" wrote:
> I've looked around for exhaust gas temperature info and didn't really
> find anything helpful.
>
> any suggestions?
>
> ________________________________
> From: Gmclist on behalf of
> richshoop@comcast.net
> Sent: Wednesday, September 20, 2017 11:51:41 PM
> To: gmclist
> Subject: Re: [GMCnet] 4.8 MPG.
>
> Watching the exhaust gas temperature is fairly standard stuff for aircraft
> piston engines, lots of information available for that area of interest. Be
> VERY careful with the lean out, minute changes can dramatically change the
> engine operating characteristics, including exhaust valve damage, pre
> ignition due to higher operating temperatures, etc,
>
> ----- Original Message -----
>
> From: "James Hupy"
> To: "gmclist"
> Sent: Wednesday, September 20, 2017 8:12:57 PM
> Subject: Re: [GMCnet] 4.8 MPG.
>
> Bob, watch the exhaust temp in just off of lean cruise. It gets into the
> danger zone really fast. Talk to Randy and George before you do too much,
> particularly with a heavily laden coach. It can be done, with careful
> management.
> Jim Hupy
> Salem, Or.
> 78 GMC ROYALE 403
>
> On Sep 20, 2017 7:02 PM, "Bob Dunahugh" wrote:
>
> That's the MPG range I got too with the carb. Got about 7.5 mpg with a
> 17000 lbs GVW over 538 miles to Elkhart. Time will tell with more miles.
> Extremely pleased with the Howell EFI. Next to add the EBL so I can read
> instant MPGs, and go to the 16.5 fuel mixture in the lean burn mode. Bob
> Dunahugh
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