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2. Toyota R engine - Wikipedia

   en.wikipedia.org/wiki/Toyota_R_engine

   A popular modification to the early 22R is to use a 20R head. Contrary to popular lore, the 20R head does not have smaller combustion chambers. The misunderstanding originated when the 22R came out and an advantage was its higher compression ratio, so swapping a 20R block with a 22R, there was a compression increase.

3. Toyota ZR engine - Wikipedia

   en.wikipedia.org/wiki/Toyota_ZR_engine

   The Toyota 8ZR-FXE is a 1.8 L (1,797 cc) Atkinson cycle engine paired with electric motor/generators in a hybrid drive system. This engine is an analogue of the 2ZR-FXE for use in China only. [14] Specifications. Type: inline 4 cylinder DOHC 16 valve VVT-i Atkinson cycle; Exhaust volume: 1.8 L (1,798 cc)

4. Tuned exhaust - Wikipedia

   en.wikipedia.org/wiki/Tuned_exhaust

   A 4-2-1 exhaust system is a type of exhaust manifold for an engine with four cylinders per bank, such as an inline-four engine or a V8 engine. The layout of a 4-2-1 system is as follows: four pipes (primary) come off the cylinder head , and merge into two pipes (secondary), which in turn finally link up to form one collector pipe.

5. Exhaust system - Wikipedia

   en.wikipedia.org/wiki/Exhaust_system

   Exhaust system of the Opel Corsa B 1.2 petrol Exhaust manifold (chrome plated) on a car engine. An exhaust system is used to guide reaction exhaust gases away from a controlled combustion inside an engine or stove. The entire system conveys burnt gases from the engine and includes one or more exhaust pipes. Depending on the overall system ...

6. Exhaust heat management - Wikipedia

   en.wikipedia.org/wiki/Exhaust_Heat_Management

   These ceramic coatings are highly advanced coatings applied via plasma spray, and as a result, the coating is effectively welded to the surface of the exhaust system. They can offer small performance benefits [1] due to the low thermal conductivity of the ceramic compound. This reduces engine bay temperature and increases exhaust velocity.

7. Vehicle emissions control - Wikipedia

   en.wikipedia.org/wiki/Vehicle_emissions_control

   While 1979 and 1980 systems are very similar, the 1981 system (2nd generation) will differ in that it may include additional engine control systems (i.e., electronic spark timing, idle speed control, etc.) The Emission Control System under development has been designated C-4.This stands for Computer Controlled Catalytic Converter.