Dashpot damper
Jaguar: Mark II 3.4, 340 and 3.8 with SU-HD6 carburettors (1959-69) • XJ6 Series I and II with SU-HS8 carburettors (1971-76): Series I from March 1971 (4.2 with A/C from engine no. 7L29582, 4.2 without A/C from engine no. 7L26480, 2.8 from engine no. 7G16693), Series II to May 1976 (4.2 to engine no. 8L26203, 4.2 Australia exports to engine no. 8L28385, 3.4 to engine no. 8A5098)
Land Rover: Series IIA 2.6 litre six cylinder with SU-HD6 carburettor (1967)
MG: MGA 1500 with SU-H4 carburettors (1955-59)
Austin Healey: BN1, BN2, BN4 and BN6 plus BN7 and BT7 to engine no. 29D-H2863 (1953-59) - feature: twin H4 resp. HD6 carburettors
Triumph: TR3, TR3A and TR3B (1955-62) plus TR4 to CT21470 (1961-63) - feature: twins SU-H6 carburettors
with hexagonal black plastic head but without vent - length of the rod: 2.125"
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.
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