For enthusiasts diving into the world of the Datsun 240z, understanding parts compatibility is key to upgrades, repairs, and restorations. Many owners are pleased to discover a significant degree of interchangeability within the Z car family, particularly the S30 generation (240z, 260z, and 280z models). This guide focuses on commonly interchangeable parts that don’t require extensive custom fabrication, making your Z car project more manageable. Keep in mind, while parts may be interchangeable, installation nuances can exist and are not covered in detail here.
Engine and Drivetrain Parts: Maximizing Compatibility
The engine and drivetrain components from 1970 to 1983 Z cars exhibit a high level of interchangeability. However, some crucial differences and exceptions exist:
Engine Blocks and Heads
All L-series engine blocks and heads from this era are fundamentally interchangeable. This opens up possibilities for engine swaps and utilizing components from different models. However, if you plan to use a pre-1975 cylinder head with an EFI (Electronic Fuel Injection) system, you’ll need to machine notches into the intake ports to accommodate fuel injectors.
Transmissions
Most transmissions across the 70-83 range are interchangeable within the S30 and early S130 models. A notable point is the difference in flywheels: naturally aspirated coupes and all 2+2 manual models utilize different flywheel sizes compared to turbo coupes. The turbo 5-speed transmission, a Borg Warner (BW) unit found in later 280zx models, requires a different driveshaft and shifter linkage compared to earlier 5-speeds. For those seeking a taller gear for highway driving, the 1983 naturally aspirated 5-speed transmission offers a beneficial overdrive 5th gear.
Differentials
Upgrading the differential in a 240z is a common modification. The robust R200 differential, found in later 280z and 280zx models, can be swapped into a 240z which originally came with an R180. This swap necessitates the use of the 280z mustache bar for proper mounting. Furthermore, certain 1984-1989 Z31 turbo models were equipped with an R200 CLSD (clutch-type limited-slip differential) featuring a finned cover, which is a desirable upgrade for performance enthusiasts.
Fuel Systems
For owners of EFI-converted 240zs, early 280z intake manifolds are advantageous. These pre-smog, non-webbed manifolds offer a cleaner look and reduced emissions clutter compared to later versions. If you are maintaining a carbureted 240z, consider upgrading to round top SU carburetors from 1970-1972 models. These are less encumbered by smog control devices than the later flat top SU carbs. When transitioning a carbureted 240z to EFI, a baffled fuel tank is essential to prevent fuel starvation. The fuel tanks from 1975-1976 280z models are bolt-in replacements, but you must also use the 280z tank straps for proper installation.
Body Panels and Glass: Streamlining Restoration
Body panel interchangeability within the S30 range (1970-1978) is generally good, simplifying bodywork and restoration:
Fenders, Hoods, and Hatches
Fenders, hoods, and rear hatches from all 1970-1978 S30 models are interchangeable. This simplifies sourcing replacement panels and offers flexibility in styling.
Doors and Glass
While doors from different years are not directly interchangeable due to latch differences, they can be modified to fit if absolutely necessary. Glass components, however, are generally interchangeable across the S30 range.
Performance and Maintenance Upgrades Beyond Stock
Beyond direct Z car part swaps, several other readily available upgrades enhance the 240z:
Brake Calipers
A popular brake upgrade involves utilizing Toyota 4X4 “S12+8” calipers. These provide a significant improvement, upgrading the stock 240z’s two-piston calipers to a more potent four-piston setup.
Fuel Injectors
For those increasing engine output, readily available “barb style” fuel injectors from various vehicles can be used to provide higher fuel flow rates. Furthermore, newer GM and some German vehicles utilize a squeeze-clip version of the Bosch injector plug found on the L28E engine, offering a more durable alternative to the often-fragile stock clips.
This overview provides a starting point for understanding 240z Car Parts interchangeability. Numerous smaller components are also interchangeable, but this guide covers the most common and impactful swaps for those new to Z cars. For detailed information and in-depth discussions on Z car modifications, online resources like HybridZ.org are invaluable. Remember to utilize the search function on forums, as most topics have been extensively discussed within the Z car community.
