SU Carburettor Piston Spring   P/N AUC2107

This spring is LIGHT BLUE and BLACK on the end of the coils 4.5oz. at 3.875in. Length

Suits:

SU Carbs; H8, HD8; HS8;

As used in:

Aston Martin DB4 Special  3.7 L 6 cyl. 1961-62 3 X HD8

Jaguar Mk VII with “C” type head  9:1 CR 6 Cyl. 1954-56 2 X H8

Jaguar XK120 with :C” type head  1952  2 x H8

Jaguar XK140C 3.4L 6 Cyl. 1954 2 x H8

Jaguar XK150S 3.4L  6 Cyl. 1959-62 3 x HD8 Th.

Jaguar Mk X 3.8L 6 Cyl. 1961-64 3 x HD8 Th.

Jaguar 420 Series 4.2L 1967-68 2 x HD8 Th.

Jaguar 420G Series 4.2L 1967-68 3 x HD8 Th.

Jaguar E Type 3.8L 6 Cyl. 1961-64 3 x HD8   

Jaguar E Type 4.2L 6 Cyl. 1967-68 3 x HD8

Rover P6 TC 2000 4 Cyl. 1966 2 x HD8

Rover P6 TC 2000 4 Cyl. 1967-74 2 x HS8

NOTE:

This spring is suitable for 2 inch diameter Throttle Carburettors only.
The Piston Spring phased out heavy weighted pistons, designed to produce a resistance to the rising suction piston in order to balance the venturi size with the correct mixture/air flow. The ultimate aim being that the engine should be able to produce full power with the Piston fully raised together with progressive acceleration and steady cruising over the whole Range of driving.
Rich mixture for fast acceleration being provided by the Damper.

 THIS SPRING IS FOR NORMAL SUCTION CHAMBER (IT WILL NOT SUIT HIF OR BALL BEARING TYPE CHAMBERS)

For lighter load in 2" carbs use THIS SPRING - AUC2107 [Light Blue & Black] [Replaces AUC5014] 4.5oz. @ 3.875"  

For heavier load in 2" carbs use AUC4818 [Light Blue & Red] [Replaces AUC2091] 18oz @ 3.875"