Tagged under the bonnet

Back to the Basics – Gasoline!

We all use gasoline, but rarely give it much thought. We have come to accept the lack of lead, seasonal volatility changes, local differences, and the presence of “gasohol”. But most of us still have some concerns about how these affect our cars’ performance and what adverse affects they may have on the components of our cars’…

Back to the Basics – Understanding S.U. Carburetors

The S.U. carburetor is one of the simplest “full function” carburetors ever put on modern cars. However, since they work so differently from most other carburetors, few people in the U.S.A. really understand them well. Many, if not most, problems attributed to these carbs being “out of tune” are really faults of the ignition system,…

Back to the Basics – Your Ignition System

This is the first of a series of articles on basic tuning techniques to help you maintain your car to original factory specifications. Since the ignition system must be in good order before any other systems, such as the carburetor(s), can be properly adjusted, we will begin with a brief discussion on ignition timing procedures. These instructions…

Emission Control – Crankcase Breathing and Evaporative Loss

Engine exhaust is the sole source of a vehicle’s carbon monoxide (CO) and nitrous oxides (NOx) emissions, and accounts for about 62% of a vehicle’s hydrocarbon (HC) emissions. Ina perfect situation, the only emissions from a gasoline engine would be carbon dioxide and water. However, the combustion process within an engine is never complete. This…

Under the Bonnet: Emission Control—Crankcase Breathing and Evaporative Loss

Identifying the separate emission control systems within the seemingly hopeless tangle of vacuum lines, hoses, pipes, and mysterious boxes and cans in your engine compartment is the key to understanding how these systems operate. These systems fall into three groups: crankcase emission control, fuel evaporation emission control, and exhaust emission control. This article will give…

Under the Bonnet – Fall 1990

Welcome to Under the Bonnet, our quarterly technical column dealing with the basic maintenance and repair of your British car. We’ll be covering topics here that have been the cause of recurrent problems and questions by customers as well as our own staff members. While much of this information may be rudimentary to old-time mechanics,…

Under the Bonnet: Tire Rotation

Welcome to Under The Bonnet, our quarterly technical column dealing with the basic maintenance and repair of your British car. We’ll be covering topics here that have been the cause of recurrent problems and questions by customers as well as our own staff members. While much of this information may be rudimentary to old-time mechanics,…

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