| Mack B-series | |
| Manufacturer: | Mack Trucks |
| Production: | 1953-1966 |
| Predecessor: | Mack L-series |
| Successor: | Mack R-series |
| Class: | Truck |
| Body Style: | Truck (bonneted cab) |
| Engine: | 6.8 L Magnadyne I6 (112 kW) (petrol) 8.4 L I6 (103 kW) (diesel) 11.0 L Thermodyne I6 (139 kW) (diesel) 11.0 L Thermodyne I6 T (164 kW) (diesel) 11.6 L Thermodyne I6 (157 kW) (diesel) 14.0 L Cummins NTC I6 T (250 kW) (diesel) 14.2 L Thermodyne V8 (190 kW) (diesel) |
| Transmission: | Mack 10-speed duplex (5-speed, 2-speed auxiliary) Mack 15-speed triplex (5-speed, 3-speed auxiliary) Mack 20-speed quadruplex (5-speed, 4-speed auxiliary) |
The Mack B series is a model line of trucks produced by Mack Trucks between 1953 and 1966.[1] The successor to the 1940-1956 Mack L series,[2] the B-series was a line of heavy conventional-cab trucks. Adopting a more streamlined appearance over its predecessor, the B-series was designed with a sloped windshield and larger, rounded fenders The model line was sold in multiple configurations, including tractors and straight/rigid trucks, cowled chassis (delivery body or bus), or fire trucks.
The B-series was the first Mack truck produced with a diesel engine, introducing the Mack-produced Thermodyne inline-6 in 1953.
During 1966, Mack replaced the B-series with the Mack R-series, which lasted into the 21st century.[3] [4] [5] In total, 126,745 examples of the B-series were produced over 13 years.[6]
Chassis model designations:
Chassis letter guide:
B - school bus chassis
C - flat face cowl for the addition of a delivery body
E - built for export
F - fire truck chassis
L - light weight or weight reduced by using aluminum components
P - platform chassis (single axle straight truck)
R - right hand drive. This designation was started in 1964 but right hand drive available
S - six wheel chassis (tandem axle)
T - tractor chassis
X - severe or extreme service chassis
The B Model offered 10 different gasoline engines, from a 2911NaN1 with 1070NaN0 in the B20 to a 7071NaN1 with 2320NaN0 in the B70.
A wide range of diesels were also offered. From the B61 up to the ENDT 673 turbocharged I6 and END 864 V8 were offered. From the B73 up to the Cummins 8551NaN1 I6s up to the NTC335 were available.
The table shows the largest gasoline and diesel engines in the series.
| Model | Engine | Displacement | Type | Horsepower | Torque | |
|---|---|---|---|---|---|---|
| B20 | EN291 | 2911NaN1 | G I6 | 1070NaN0 at 2800 | 232lbfft at 1400 | |
| B30 | EN331 | 3311NaN1 | G I6 | 1220NaN0 at 2800 | 264lbfft at 1400 | |
| B4X | EN414 | 4131NaN1 | G V8 | 2140NaN0 at 4000 | ||
| END673 | 6721NaN1 | D I6 | ||||
| B53 | END673 | |||||
| B6X | EN540 | 5401NaN1 | G I6 | 1850NaN0 at 2400 | 445lbfft at 1300 | |
| ENDT673 | 6721NaN1 | TD I6 | ||||
| END864 | 8641NaN1 | D V8 | ||||
| B7X | EN707 | 7071NaN1 | G I6 | 2050NaN0 at 2100 | 615lbfft at 1200 | |
| NTC335 | 8551NaN1 | TD I6 | 3350NaN0 at 2100 | |||
| B8X | EN707 | |||||
| NTC335 |