1916 Packard Twin Six 1-25 1-35 Sales Brochure
From the brochure
PACKARD TWIN SIX “1-25” AND “1-35”
Since the completion of the first single-cylinder Packard, sixteen years ago, there has been unceasing effort in the direction of greater range of ability, combined with more smoothness and less noise. The desired results have been obtained primarily by making each power impulse smaller in magnitude and providing for many impulses in quick succession.
The turning effort exerted on the crank shaft by the impulses of the pistons is what is known as torque. What automobile engineers have constantly striven for is a uniform torque—a smoothness approaching the action of a steam turbine.
The single-cylinder motor gave way to the two-cylinder because the latter had a better torque, a more even turning of the crank shaft, due to providing two impulses in the place of one. The four and six-cylinder motors carried the development further toward the ultimate goal.
SUPERIORITY OF TWIN SIX DESIGN
Two sets of six cylinders operating on a single crank shaft, give double the number of power impulses without the addition of a single rotating motor part. This construction lends a remarkable range of activity, combined with an almost complete absence of vibration at all speeds. The result is due not only to the continuous flow of power from twelve cylinders, but also to the small bore of the cylinders and the use of a special aluminum alloy piston, with light connecting rods. The total reciprocating weight has been reduced to approximately half the weight of the corresponding parts in a Single Six of the same rating.
In addition, the smaller cylinder bore permits a higher compression, and the higher compression contributes increased thermal efficiency at all speeds. Accordingly, we find the Twin Six produces not only superior torque but also more power than is possible in a Single Six of similar capacity in cubic inches and a corresponding standard of construction. A logical result is economy of gasoline and oil.
Another factor of extreme importance is the ability of the Twin Six motor to run further with less wear on the bearings. The smaller and more frequent applications of power have far less effect on the bearing surfaces and on the entire mechanism through which the power is transmitted than in cars of fewer cylinders with impulses less frequent and each one of greater force.
The Twin Six also provides the maximum accessibility. The small included angle of the V motor allows such accessories as the starting motor, generator and water pump to be placed in the standard Packard position, just inside of the frame. This leaves the space between the cylinders clear and the valves accessible without the removal of a single accessory. Likewise, the smaller included angle permits a narrow frame, with the result that the turning radius of the new Packard, with its reduced wheelbase, is even shorter than in the Packard Six.
- Limitations of a Single Six
- Superiority of Twin Six Design
- Why you want a Twin Six
- A logical step in Packard Development
- Detailed Packard Twin Six Specifications
- High Quality Reprint
- Full Color
- 17 pages
- Dimensions 8.3” x 11.7”
- Paper Weight 115 lbs
- Saddle Stitched
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