DEUTZ AIR-COOLED DIESELS

ders and a 3.54 x 4.72-inch bore and stroke. Starting in 1954, the 514 cylinder dimensions were used for the 614 series, which came in V6, V8, and V12 configurations and continued into 1960 before being replaced by newer designs.

The 714 series, all V6, V8, or V12, debuted in 1960 and gradually replaced the 614. They shared the same 5.5-inch stroke but had a larger 4.75-inch bore for a 12-percent boost in power. They had other modern improvements such as variable-speed hydraulic fans to save parasitic drag. The 712 series inlines (1-4 and 6 cylinder), known as the “small family,” were also made in this era with 3.75-inch bore and 4.75-inch stroke.

By 1962, the “smaller family” 310 series (mainly 1-2 cylinder) was introduced with a 3.31-inch x 4-inch bore and stroke. This series carried on to the 1970s. In 1964, the 812 series inline debuted with a 3.75 x 4.75-inch bore and stroke, replacing the 712 line. Similarly, the 912 engines appeared in 1967 with a 3.94 x 4.72-inch bore and stroke. For 1972, a turbocharged version of the F6L912 would appear in the Deutz D13006 tractor, producing 20 more horsepower than the previous non-turbo tractor. Late in the decade a 913 series would debut with a 4.02 x 4.92-inch bore and stroke and a bit of a power increase. The 912 and 913 engines were very popular in the Deutz and Deutzfahr tractors. The 912 and 913 series, much evolved, are still in production in some parts of the world.

In the 1970s, several new engines appeared. On the small side were the 208 and 210 series—usually seen as one- or twocylinder units. A five-cylinder version of the 912 debuted. The 410 and 411 series (105 x 120 mm) were available, and in the 1980s a larger 413 Series engine would appear.

In 1988, a variation on the Deutz theme would appear—the oilcooled 1011 series engine (various bore and stroke combos in 2-4 cylinders). These were similar to the air-cooled engines, but they used an oil jacket around the heads and cylinder for cooling. They used a timing belt, and a water-cooled version would also be built. In the 2000s, the similar 2011 engine would appear. These engines departed from the familiar Deutz nomenclature system (see sidebar).

Deutz combustion. On the left is Prosper L’orange’s indirect injection system, which Deutz called “Two-stage Combustion.” On the right is the later direct injection. The IDI setup was standard in the early days but gradually replaced in the ‘70s.

Of course turbocharging came to Deutz as it did with all the diesel manufacturers. Shown here is a direct-injected 913 turbo from 1979.