Product description
Rotor arm for the legendary OSCA MT4, a racing-derived sports car powered by high-revving inline-four engines developed by the Maserati brothers under the OSCA marque. This distributor-mounted component plays a vital role in the ignition system, distributing high-voltage current from the ignition coil to the correct spark plug via the cap terminals.
Manufactured to original specification, the rotor arm is built with a phenolic resin body and a precision-machined copper conductor, ensuring both insulation integrity and reliable current transfer. Its design accommodates high engine speeds and thermal loads typical of historic motorsport applications.
Ideal for authentic restorations, track-prepped vehicles, or collector-grade preservation of OSCA’s iconic 1950s engineering.
Technical specifications
- Part type: Ignition distributor rotor arm
- Compatibility: OSCA MT4 (Maserati OSCA inline-four)
- Function: Rotating contact for spark distribution inside distributor cap
- Materials: Heat-resistant resin body, copper alloy contact tip
- Mounting: Press-fit on distributor shaft
- Design: OEM-style layout with correct cam clearance and arc reach
A period-correct and high-performance solution for keeping your OSCA MT4 running with factory-intended precision and reliability.
