Dashpot damper

Triumph: Spitfire USA and Canada models with Zenith Stromberg 150CD carburettor from October 1969: Mk3 from chassis no. FDU75001 plus all Mk4 and 1500 • GT6 with Zenith Stromberg 150CD carburettors (1966-73) • Vitesse with Zenith Stromberg 150CD carburettors (1962-71)

Sunbeam: Alpine Series V with Zenith Stromberg 150CD carburettors (1965-68)

with vent and black hexagonal plastic head - length of the rod: 1.7/8"

Dashpot dampers are designed to slow the rise of the suction piston in the carburettor in order to give a richer mixture on snap acceleration. They vary considerably from type to type by varying the clearances in the assembled components. The oil in the dashpot is forced through the assembly and thus slows (dampens) the piston rise. A further difference is that some are externally vented (hole in the top) and some are internally vented (angled hole in the suction chamber) these are termed dustproof and non-dustproof respectively. It is essential that the correct part is fitted to ensure smooth Running of the engine.