Four-stroke Performance Tuning (Graham Bell)

An Introduction to Four-stroke Engine Tuning Principles

Air density within the engine

• The next principle that we need to establish is that two 2-litre engines operating at the same atmospheric conditions can have different hp outputs because the air is more dense in the cylinders of one than the other. Even though air quality started out at the same level things change on the passage into the cylinders. One engine has everything working against it. It is drawing in air which has been heated by the radiator and exhaust manifold. Its inlet manifold receives no cooling air flow, but rather hot air that has passed through the radiator. Internally this engine is very hot. The water temperature is regulated at 95°C so the air flowing into the cylinders collects heat.

• This engine features an impressive-to-the-eye inlet system featuring what appears to be a tuned length inlet manifold with rolled entry bellmouths. Unfortunately the engine will now be breathing hot low-density air, especially as the uninsulated exhaust headers and the hot engine are only inches away from the air intakes.

• Melted ceramic core in CAT blocks exhaust flow.

Другие книги по тюнигу:

• руководство по тюнингу механической коробки передач
• книги по увеличению мощности двигателя посредством наддува
• инструкция по тюнингу ВАЗ 2110

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