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Old 02-15-2017, 08:08 AM   #100 (permalink)
gumby79
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Join Date: Dec 2014
Location: Butte, Montana
Posts: 725

little jona - '91 Dodge D 250 first gen cummins LE
Team Streamliner
90 day: 23.4 mpg (US)

Little Jona airo modded - '91 Dodge RAM 3/4 TON D 250 2×4 AUTO
Pickups
Team Cummins
90 day: 18.5 mpg (US)

The Salted Hound Jenny. - '87 Dodge Ram 50/D-50 5sp 4X4
90 day: 20.24 mpg (US)

Jona Allison aero - '91 Dodge Ram D-250 Le
90 day: 20.76 mpg (US)
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On the fly lean Burn Idea

I had an idea on a carb mod for your lean burn setup.
Quote:
Tuning the fuel to air ratio for peak efficiency with an EGT Probe
From the peak EGT, either increasing or decreasing the fuel to air ratio causes a change in Exhaust gas temperature. Richer EGT cooling occurs because there is excess fuel cooling the exhaust stream via less than optimum burning, and leaner , heating occurs because there is excess air (oxygen) making for a hotter burn. So you must have a base line of where you are starting from regarding cylinder exhaust gas temperatures and a rich or lean condition of the fuel / air delivery system.
Peaking exhaust gas temperature (EGT) with a carbureted engine is frequently a vague point because of less efficient atomization compared to electronic fuel injection to the individual cylinders. As a result, carbureted engines tend to operate smoother at +25 degree +50 degree F on the rich side of peak exhaust gas temperature (EGT).
Fuel injected engines typically provide a more precise peak exhaust gas temperature, therefore the EGT system is likewise a more precise method of performance tuning with fuel injection.
A simple definition of peak EGT is the chemically correct mixture of fuel and air, which gives something close to 100% utilization of all the fuel and all the air delivered to the cylinder.
EGT Probes LVDT Position Sensors Pyrometers Signal Conditioners Electronics H.G. Schaevitz Ind.
Quote:
Add a screw to the step up spring cover. To push ithe plunger/metering rod down leaning the motor .hook a twist type cable to the screws (have to figure out a spliter, 2 metering rods.) Run into the cab then when cruising down the highway twist to tune. As there is some taper between the needle steps.
This could be automated with a servo controler and this signal amplifier and a fast response probes at 125ns run one for each bank.
Add a vac switch to shut system down in power mode to alow full enrichment.
Dreem big chisel down to reality
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__________________
1st gen cummins 91.5 dodge d250 ,HX35W/12/6 QSV
ehxsost manafulld wrap, Aero Tonto
best tank: distance 649gps mi 24.04 mpg 27.011usg
Best mpg : 31.32mpg 100mi 3.193 USG 5/2/20


Former
'83 GMC S-15 Jimmy 2door 2wd O/D auto 3.73R&P
'79 Chevy K20 4X4 350ci 400hp msd custom th400 /np205. 7.5-new 14mpg modded befor modding was a thing
87' Hyundai Excel
83 ranger w/87 2.9 L FI2wd auto 18mpg on the floor
04 Mitsubishi Gallant 2.4L auto 26mpg
06 Subaru Forrester XT(WRX PACKAGE) MT AWD Turbocharged 18 plying dirty best of 26mpg@70mph
95Chevy Blazer 4x4 auto 14-18mpg
04 Chevy Blazer 4x4 auto 16-22mpg


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