Triumph

le> TRIUMPH 4 CYLINDER 1980-76 1493cc Spitfire ZS-1 150CD 4278 1980-75 1998cc TR7 (2 Carb) ZS-1 175CD 4278 1976-75 1998cc TR7 ZS-1 175CD 4278 (Calif, 1 Carb) 1975-73 1493cc Spitfire Mark IV ZS-1 150CD 4278 1974-72 1296cc Toledo SU-1 HS-4 4330 1972-70 1296cc Spitfire Mark IV SU-1 HS-2 4330 (2 Carb) 1972-70 1493cc Spitfire 1500 SU-1 HS-4 4330 1972-69 1296cc Spitfire ZS-1 150CD 4278 Mark III, IV 1968 2138cc TR4A (2 Carb) SU-1 HS-6 4330 1968-67 1296cc Spitfire Mark III SU-1 HS-2 4330 (2 Carb) 1966-65 2138cc TR4A (2 Carb) SU-1 HS-6 4330 1966-62 1147cc Spitfire Mark III SU-1 HS-2 4330 (2 Carb) 6 CYLINDER 1976-69 2498cc TR6 (2 Carb) ZS-1 175CD 4278 1974-66 1998cc GT6, Mark I, II, III ZS-1 150CD 4278 (2 Carb) 1973-72 1998cc Bullet, Sprint SU-1 HS-6 4330 (2 Carb) 1969-68 2498cc TR250 (2 Carb) ZS-1 175CD 4278 1964-63 1596cc Vitesse (2 Carb) SU-1 HS-2 4330 1973-70

Recent Posts

How a Choke Works Integral Type

When the engine is cold a richer fuel mixture is needed. As it warms up the mixture must be leaned out. This is where the automatic choke circuit comes into play.
Choke ThermostatChoke Thermostatic Coil

The choke shaft extends through the carburetor into a round housing. Inside the housing there is a thermostatic coil spring. This spring will wind & unwind depending on the temperature. When cold the thermostat will hold the choke valve closed. As the temperature warms up, the spring expands and allows the choke valve to open.



Vacuum BreakChoke Vacuum Piston

The choke vacuum piston is linked to the choke butterfly by a small linkage. At idle, which will have full vacuum, the piston will be pulled into the piston well. This puts pressure against the thermostat coil trying to open the choke valve slightly.


Offset Choke Valve

Not all carburetors will have this air valve. Marvel Schebler & the Holley 1 barrel carburetors are a few examples that do. The air valve is placed offset on the choke valve. This keeps the choke from causing a too rich condition.

stove PipeStove Pipe

Most automatic chokes systems will use a stove pipe to heat up the thermostat coil. The pipe heats up, using the exhaust manifold and the heat is then pulled up to the thermostat using vacuum from the carburetor, which is fed by the intake manifold.

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