LZ6
HEAD PROJECT
The engine was a pure Nissan works engine featuring a twin-cam, a 4-valve head mounted on an L4 cylinder block. It was developed for competition and utilized in domestic and international races for approximately 10 years, from 1973 to 1983.
At the time, Nissan was competing with OHV single-cam A-type engines, but it was struggling against other companies that offered 4-cylinder twin-cam heads. As soon as the FIA regulation changes were announced, Nissan began developing the LZ engine. The cars equipped with the LZ engine dominated the top three positions in their debut race at the 1973 Japanese Grand Prix, winning significantly.
The LZ engine demonstrated remarkable speed and durability overseas by winning both the Southern Cross Rally and the Safari Rally from 1977 to 1982. During the same period, from 1978 to 1982, the LZ engine was used in numerous cars competing in Formula Pacific FP1600, the top category of domestic racing, achieving multiple championships. Overall, the LZ engine helped produce a series of championship-winning cars in Formula Pacific during these years.
From 1979 to 1983, the turbocharged LZ20B engine was used in Nissan’s Super Silhouette (Group 5) race cars, including the Skyline, Silvia, and Bluebird models. This engine ultimately produced 570 PS, making it the primary powerplant for Nissan's works cars during that period.
The LZ6 is a 6-cylinder, twin-cam, 4V head that pays tribute to the LZ (4-cylinder) head while incorporating the latest design and manufacturing technologies.
The LZ head was initially developed for the L4 block. After analyzing it with CT scans, it became evident that the design was exceptional and created without compromise, aimed at achieving victory.
As someone familiar with the LZ head (4-cylinder), I was curious why there wasn't an LZ head designed for the L6 block. This curiosity led us to initiate the L6 Head Project to create the ideal L6 head (OHC). Alongside this, we released Ver.PSN and Ver.JP, while also beginning the development of the exceptional LZ6 head.
We didn't simply create a 6-cylinder version of the original LZ head by extending two cylinders. Instead, we collaborated with Mr. Yoshimasa Hayashi, the original designer of the LZ head, and sought guidance from Mr. Kazunori Inagaki of INAGAKI DESIGN, who has inherited Mr. Hayashi's ideas. Together, we aimed to develop the LZ6, a modern revival of the LZ head.
While the exterior of the LZ6 honors the original LZ head, we have significantly enhanced the durability of the cam gear train. Using the latest design techniques and knowledge, we also increased the characteristic valve angle and redesigned significant components, such as the ports and combustion chamber.
The LZ6 Head Project was officially launched to create "the world's highest performance and highest quality twin-cam, 4V head for L6 engines.
Specification
LZ6 HEAD
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LZ6-3.2
LZ6-2.8
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ENGINE TYPE
LZ6（L28 Cylinder Block）
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ENGINE CATEGORY
Water-cooled in-line 6-cylinder
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Valve mechanism & Drive system
DOHC 4valve cam gear train
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Boa x Stroke
LZ6-3.2φ89.0 x 85.0mm
LZ6-2.8φ89.0 x 73.7mm
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Total displacement
LZ6-3.23171cc
LZ6-2.82750cc
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Compression ratio
12.5〜13.0
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Maximum output
400ps〜
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Maximum torque
LZ6-3.235kg・m 〜
LZ6-2.830kg・m 〜
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Maximum RPM
LZ6-3.28,000rpm 〜
LZ6-2.810,000rpm 〜
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Fuel supply equipment
Fuel Injection or Carburetor
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Ignition device
M10 Long Reach Spark Plug Reinforced Ignition
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Fuel
Unleaded premium gasoline