Carburation

Cold start system

• The cold starting system provides mixture enrichment to allow starting when either the engine or the weather is cold. The system used on Weber DCOE, SU and some motorcycle carburettors does not affect the air flow capabilities of the carburettor. However, the choke plate and shaft fitted to most carburettors does reduce air flow and creates unwanted turbulence through the carburettor throat. Racing engines should therefore have the choke assembly removed if the regulations allow this modification.
• If you live in a warm climate, the choke assembly can be removed from road machines, but it may be necessary to floor the accelerator a few times to provide a rich starting mixture via the accelerator pump. You will have to allow the engine to warm up before driving off, but this is really a good thing as engine wear and oil dilution will be reduced.

Idle and progression system

• The idle system provides a rich mixture at idle and low speeds, when not enough air is being drawn through the venturi to cause the main system to operate. When the throttle plate (butterfly) is nearly closed, the restriction to air flow causes a high vacuum on the engine side of the throttle plate.

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Другие книги по тюнингу:

• руководство по турбонаддуву как радикальное средство повышения мощности
• книги по тюнингу двигателей
• инструкция по повышению мощности двигателя автомобиля

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