2.0L 16v - J7R 752 This page gathers the Renault J7R 752 engine parts stocked by NSB Concept. The range is deliberately narrow and we say so plainly: one active reference, a WÖSSNER forged piston kit for the 2.0 turbo fitted to the Renault 21 Turbo 175hp of 1987-1990. Forged pistons rebuild the bottom end of a factory-boosted block and hold the loads a cast piston no longer takes once boost is raised. If you would rather start from the car than from the engine code, the RENAULT 21 page opens onto the RENAULT 21 Turbo 175cv J7R 752 1987-1990 sub-category.