Kits, parts and manuals for classic carburetors.
carburetor parts index | carb tech info & manuals | ordering & shipping | about us  


Carburetor Tune Up Guide

previous page: Compund Carburetion


Tune-up was probably the first preventive service developed for the benefit of the automobile owners and operators. Previously, service was considered necessary only after the motorist experienced trouble. Today, he expects the serviceman to keep him out of trouble. This is possible on account of the per­fection of the modern automobile engine and the development of testing instruments. By the proper application of this equipment, and by knowing what to check and when to check, the up-to-date carburetor and ignition mechanic can reduce the possibility of trouble on the road almost to the vanishing point, thereby pro­tecting the investment in the motor vehicle and giving greater peace of mind and feeling of safety. The first new car tune-up is the most important because the various new parts will wear  comparatively fast and consequently the original adjustment will change. A new car tune-up is necessary to restore the original standards of adjustment. There should be no great need of new parts at this time, but the adjustments are necessary to give the car its original power and speed, its fast pick-up and economy. This does not mean tinkering and testing this and that until the engine seems to be running better, but actually it consists of systematic adjustments to check the wear and deterioration that gradually take place as the car is operated.


Before you start to tune-up a gasoline engine, all tires must be checked for inflation, and the front end toe-in should be correct. Anything that will tend to create frictional drag will definitely impair the engine's performance as well as the gasoline economy factor, because of the added strain on the en­gine. Tire inflation specifications should be followed very closely because at the proper point of inflation, a car will roll along with the least amount of effort.

The modern mechanic is becoming more conscious of the fact that the late model high-speed, high-compression engines can only turn out the performances for which they are built when they are properly tuned and adjusted. It was found that these engines will perform properly over a much longer period of time without possible road failure when they are completely tuned up at inter­vals of approximately five to six thousand miles.

In checking over the late model high-speed, high-compression engine, it is well to remember that we have three fundamental basic principles to follow in order to bring out the best possible results. These are as follows:

1. Compression
2. Ignition
3. Carburetion

next: Compression, Ignition and Carburetion


Table of Contents

The Carburetor and Its Purpose

Tune-Up of the Gasoline Engine