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|  MIL-T-2452J
3.3.1.2 Low speed. Low speed shall be calculated with the engine operating at not less
than 35 percent of recommended governed speed and shall provide a vehicle speed not greater
than 4 mph.
*
3.3.1.3 Maximum geared speed. The maximum geared speed at engine governed speed
shall be not less than 58 mph. Conformance to the geared speed specified shall be determined by
calculating in accordance with the following formula:
Maximum geared speed (mph)=
Governed speed (rpm)
Total gear reduction x tire factor (see 6.3).
3.3.2 Service brakes. The service brakes shall control and hold the vehicle on a
30 percent grade when the vehicle is loaded to its specified GVW. The service brakes shall stop
the vehicle, loaded to specified GVW, within the stopping distance requirements of Federal
Motor Carrier Safety Regulation 393.52.
3.4 Chassis components.
3.4.1 Engine. The engine furnished shall be the chassis manufacturer's standard or
optional engine for the commercial model truck which meets or exceeds the requirements of this
specification.
*
3.4.1.1 Diesel engine. Unless otherwise specified (see 3.4.1.2), the vehicle shall be
equipped with a liquid cooled, compression ignition, two-stroke or four-stroke cycle diesel
engine, with not less than six cylinders. Diesel engines for class A vehicles shall have not less
than 4 four cylinders. Engine net horsepower figures used in performance prediction
calculations shall be determined in accordance with SAE J1349.
*
3.4.1.2 Gasoline engine. When specified (see 6.2), the vehicle shall be equipped with a
liquid cooled, internal combustion, four-stroke cycle gasoline engine, with not less than
six cylinders. The engine furnished shall provide the required vehicle performance when
operated on unleaded fuel with a research octane rating of 91 at an engine speed of not more than
the manufacturer's recommended operating speed. The engine shall be capable of warranted
operation on unleaded fuel when used in accordance with the operator's manual. Net
horsepower used in performance prediction calculations shall be determined in accordance with
SAE J1349.
*
3.4.1.3 Oil filter. A full flow type oil filter shall be furnished. When specified for diesel
engine driven vehicles (see 6.2), an independently mounted, minimum 10-quart, bypass oil filter
with replaceable element, or the manufacturer's standard bypass filter, shall be furnished in
addition to the full flow filter.
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