What is a Tri-Power carburetor?

Tri-Power was the name for an arrangement of three two-barrel carburetors installed on large performance V8s offered by the Pontiac Division of General Motors in the late 1950s and 1960s.

How many CFM is a Pontiac Tri-Power?

4bbl comparison. It was on a 68 GTO with a 428. The 4bbl was stock 750 quad. Their estimate of the Tri-power was 800cfm.

What is GTO Tri-Power?

The triple carburetor engine pioneered a unique design and sparked the origins of the blanket term “Tri-Power”. This original GTO is often referred to as the first American muscle car. An option on the original 1964 GTO, the Tri-Power engine would eventually be phased out by the Rochester quadrajet carburetor in 1967.

Which way do you turn a carb mixture screw?

On most carburetors, turning the mixture screw in (clockwise) leans the mixture, while counterclockwise (out) enriches the mixture. Initially, if the engine stumbles or the vacuum drops when turning the mixture screw in, turn both screws out about a -turn and evaluate the results.

How do I know if my tri-power car needs tuning?

All tri-power cars have tanks that allow visual inspection of fuel quality. Before you start any tuning or troubleshooting, make sure the fuel is still volatile; it shouldn’t smell like varnish. Check for water at the bottom of the tank with a flashlight.

How to adjust carburetor fuel level?

With the engine running the fuel level at each carburetor should be adjusted. Remove the fuel level sight plug and rock the car to see if any fuel spills out. Fuel should be at the bottom of the sight plug threads.

What happens when you put 3 carburetors in a car?

When the carburetors are set up properly, the feeling of an additional four barrels opening is exhilarating. The acceleration rate is similar in a Corvette with a supercharger or nitrous. The trick is keeping clean fuel in three carburetors on a vehicle that is rarely driven.

How do I tune the center carburetor?

Once the idle, main metering, and power circuits have been calibrated on the center carburetor, one may install the two end carbs and tune them for W.O.T. Again, this is best accomplished with the use of an air fuel ratio meter. Idle and cruise settings of the center carburetor SHOULD NOT CHANGE when the end carbs are installed.