Automotive Transmission Beaverton OR

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Jiffy Lube
(503) 626-3536
11150 Sw Beaverton Hillsdale
Beaverton, OR
Oil Change and Lube, Automotive Transmission

Beaverton All Transmission
(503) 644-8111
12295 SW Millikan Way
Beaverton, OR
AAMCO Transmissions
(503) 259-8640
18950 Southwest Shaw Street
Aloha, OR
Tigard Transmissions
(503) 639-9108
11646 SW Pacific Highway
Portland, OR
Jiffy Lube
(503) 684-8800
12860 Sw Pacific Hwy
Portland, OR
Oil Change and Lube, Automotive Transmission

AAJAX Transmissions
(503) 646-2127
7550 Southwest Beaverton Hillsdale Highway
Beaverton, OR
AATCO Transmission & Transaxle
(503) 626-4619
13980 Southwest Tualatin Valley Highway
Beaverton, OR
Aamco Transmissions - Beaverton
(503) 646-8148
18950 Southwest Shaw Street
Beaverton, OR
Datatrans Products Inc - Cables-Connectors-Data Transmission Products
(503) 670-9956
8900 Southwest Burnham Street Suite F6
Portland, OR
H & H Auto & Transmission Center
(503) 620-9806
11643 Southwest Pacific Highway
Portland, OR

For fuel efficiency: Automatic/automated transmissions

For an increasing number of on-highway fleet operations, automatic and automated manual transmissions are becoming standard specifications. While providing an inherent safety benefit by helping eliminate the need for drivers to make fatigue-producing and distracting shifts, these gearboxes also are seen as a means of enhancing fuel efficiency.

“An automatic transmission can provide superior fuel efficiency during acceleration,” says Lou Gilbert, director of North American Marketing at Allison Transmission, the maker of commercial-duty automatic transmissions. “In an automatic transmission full-power shifts are a highly fuel-efficient way to put engine power to the ground. Manual transmissions must interrupt engine power every time a shift is made, which creates powertrain inefficiencies. Full power shifts with an automatic transmission can help consume proportionately less fuel.”

During cruising, Gilbert also notes, correct transmission gear ratios play a key role in achieving maximum fuel economy by keeping the engine operating in its recommended RPM range. In a fully automatic transmission, the torque converter allows internal ranges to be higher (lower numerically) than a comparable manual transmission, which can reduce engine RPM and fuel use at lower cruise speeds. At higher cruise speeds, the automatic’s overdrive ratios keep engine RPM in the optimum fuel economy range.

Controlling fuel economy
The driver controls engine torque with the accelerator pedal, points out Mark Boardman, applications engineering manager for Eaton Corp. and the Roadranger organization, which manufactures the UltraShift line of fully automated transmissions. However, he adds, it is the drivetrain specifications –– including the transmission’s overall gear ratio and step size –– that control at what speed the engine will operate under any given condition and what level of fuel economy can be achieved.

“The transmission overall gear ratio range needs to be selected to provide the level of startability required for the application while also providing the top-end gear ratio for cruise-speed operation,” Boardman explains. “The number of gears and step size is selected to keep the engine operating in its area of best fuel efficiency. To get the best MPG performance, engines with narrow fuel islands require smaller step size transmissions with more gears. Engines with wider fuel islands can use larger step transmissions with fewer gears.

“Transmission automation is being used by many fleets in an effort to make the job of driving a truck not only easier and safer, but also more fuel efficient,” Boardman continues. “The design of an automated manual transmission combines the fuel efficiency of a manual transmission with the precision of automated shifting.”

Test results
“Since shifts are optimally performed by an automated ...

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