Detroit Diesel Allison Announces Significant Engineering Advancements To Its Series 149 Engines

Detroit Diesel Allison (DDA) Division of General Motors has announced significant engineering advancements to its Series 149 engines (now designated "Silver 149s") used extensively in mining, construction, industrial and marine applications.

One technological advancement credited with a 6 to 10 percent improvement in fuel economy is DDA's air induction system. The primary feature of this system is a blower bypass relief valve located in a special chamber between the intercooler and the blower. It operates as follows: 1. At suitable engine speed and load, the bypass valve allows air pressure on the inlet and outlet sides of the blower to equalize. This virtually eliminates the pumping load of the blower.

2. The blower continues to turn since it is driven by the gear train of the engine. However, with the pumping load removed, the blower is in a free wheeling state.

3. In this state, the blower requires minimal horsepower to operate. This savings in friction horsepower translates directly into increased fuel efficiency.

Newly-designed and re-engineered components are featured on the Silver 149s, representing stateof- the-art diesel technology.

Tube-and-Shell Oil Cooler Available on 8V- and 16V-149TI engines, the tube-and-shell oil cooler increases engine life through decreased oil temperature, improved oil filtration and better oil flow. For each 10 degree F reduction in oil sump temperature, related componentry life is increased by approximately 50 percent. Oil filtration is improved by the addition of two more oil filters which should extend the oil and filter change intervals.

Other advantages of the new tube-and-shell cooler include increased oil flow by up to 17 percent; increased oil gallery pressure; reduced oil system restriction; and cleanable tube bundle.

Crankcase Monitor This device senses higher-thannormal crankcase pressure resulting from piston blow-by, seal leakage or other detectable malfunctions. The crankcase monitor signals a warning to the operator so that he can shut down the engine immediately and prevent extensive engine damage.

Cylinder Kit Components All Silver 149s use DDA's crosshead piston which features a separate crown and skirt that work independently of each other. The crown absorbs combustion forces while the skirt absorbs thrust loads. To increase the reliability of the rod-topin joint, the piston incorporates a new, one-piece, solid piston pin for greater durability and longer life.

The new oil control ring pack can reduce oil consumption by up to 70 percent. Ring life-to-overhaul of the engine is increased significantly by maintaining uniformity of oil film across the face of the rings.

In addition to these improvements, DDA's Silver 149s provide benefits to the user in increased productivity, excellent performance at high altitudes and upgrading of the engine through a planned retrofit program.

Outstanding performance at high altitudes is available from Detroit Diesel Silver 149s because turbocharging and intercooling in the engines have a tendency to minimize the effect of less dense air. The turbocharger forces more air into the air induction system, and the intercooler cools it to make it more dense. The 16V-149TI model shows no horsepower loss up to 10,000 feet and no adjustments to the fuel system are necessary.

For further literature containing full information, Circle 15 on Reader Service Card

Maritime Reporter Magazine, page 37, Sep 1985

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