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The 20R head has straight ports, so can flow better than the 22R head, improving high RPM power. The 20R head is a simple bolt-on modification for the pre-1985 block, but also requires the use of the 20R intake manifold, making it almost impossible (there's a lot of matching necessary) to use with the 22R-E EFI system. [21]
A leak in the head gasket - often called a "blown head gasket" - can result in a leak of coolant, the combustion gasses, or both. Blue smoke from the exhaust suggests that excess oil is entering the combustion chambers (although there are other possible causes than a head gasket leak). White smoke from the exhaust suggests that coolant is ...
The 1985 model year (which began production in August 1984) saw the arrival of the electronically fuel-injected 2.4 L 22R-E (and 22R-EC with California emissions controls). This increased the power output from 96 hp (72 kW) for the 22R [18]: 204 to 116 hp (87 kW) for the 22R-E, [19] though the carbureted engine remained available until 1988 ...
A rocker cover gasket (valve cover gasket in the US and Canada) is used to seal the joint between the cover and engine head. Failure of the gasket can cause oil to leak from the engine. A head gasket is used to seal the joint between the head and the engine block.
Yamaha supplied the alloy head for these high performance normally aspirated engines fitted with twin Mikuni-Solex 40 mm side-draft carburettors and a compression ratio of 9.7:1. Gearbox was the Porsche-type synchromesh 5-speed P51 coupled to a 4.1 F series limited slip differential, giving a claimed top speed of 200 km/h (125 mph).
In sidevalve engines the head is a simple plate of metal containing the spark plugs and possibly heat dissipation fins. In more modern overhead valve and overhead camshaft engines, the head is a more complicated metal block that also contains the inlet and exhaust passages, and often coolant passages , Valvetrain components, and fuel injectors .