Toyota 21R Engine Specs
The Toyota 21R engine is a four-cylinder, gasoline-powered engine that was produced by Toyota Motor Corporation from 1979 to 1997. It was primarily used in Toyota pickup trucks and SUVs during that time period. Let’s take a closer look at the specifications of this engine.
Engine Configuration
- Engine Type: Inline-four
- Displacement: 2.0 liters (1,998 cc)
- Bore x Stroke: 86 mm x 86 mm
- Compression Ratio: 8.8:1
- Valvetrain: SOHC (Single Overhead Camshaft)
- Fuel System: Carbureted
The Toyota 21R engine featured a simple and reliable design. Its inline-four configuration means that the engine has four cylinders arranged in a straight line. This layout provides a good balance of power and efficiency.
The displacement of the 21R engine is 2.0 liters, which is equivalent to 1,998 cubic centimeters. The bore and stroke dimensions are both 86 mm, resulting in a square engine design. The compression ratio of 8.8:1 indicates the ratio of the cylinder’s maximum and minimum volumes, affecting the engine’s performance and efficiency.
The valvetrain of the 21R engine is a single overhead camshaft (SOHC) design. This means that the engine has one camshaft located above the cylinder head, operating the intake and exhaust valves. The SOHC configuration simplifies the engine’s design and reduces manufacturing costs.
As for the fuel system, the Toyota 21R engine uses a carburetor. A carburetor mixes air and fuel in the correct proportions before delivering it to the engine’s cylinders. While carbureted engines are less common today, they were widely used during the time the 21R engine was in production.
Engine Oil Specs & Service Intervals
Proper engine oil is crucial for the performance and longevity of any engine, including the Toyota 21R. Here are the recommended engine oil specifications and service intervals for this engine:
- Recommended Engine Oil: API SG or higher grade, SAE 10W-30 or 10W-40 viscosity
- Oil Capacity: Approximately 4.2 liters (including oil filter change)
- Oil Change Interval: Every 5,000 kilometers or 3,000 miles (or every 6 months, whichever comes first)
It is important to use engine oil that meets the API SG or higher grade. The API (American Petroleum Institute) rating ensures that the oil meets certain quality standards. The SAE (Society of Automotive Engineers) viscosity rating indicates the oil’s thickness or flow characteristics at different temperatures. For the Toyota 21R engine, either SAE 10W-30 or 10W-40 viscosity oil is recommended.
The oil capacity of the 21R engine is approximately 4.2 liters, including the oil filter change. It is essential to check the oil level regularly and maintain it within the recommended range for optimal engine performance.
Regarding the oil change interval, it is generally recommended to change the engine oil every 5,000 kilometers or 3,000 miles. However, it is always advisable to consult the owner’s manual or follow the manufacturer’s recommendations for the specific vehicle and engine.
| Engine Specification | Value |
|---|---|
| Engine Type | Inline-four |
| Displacement | 2.0 liters (1,998 cc) |
| Bore x Stroke | 86 mm x 86 mm |
| Compression Ratio | 8.8:1 |
| Valvetrain | SOHC |
| Fuel System | Carbureted |
In conclusion, the Toyota 21R engine is a reliable and straightforward four-cylinder engine that powered various Toyota vehicles for nearly two decades. Its specifications, including the engine configuration, displacement, valvetrain, and fuel system, contribute to its performance and efficiency. Adhering to the recommended engine oil specifications and service intervals is essential for maintaining the engine’s health and ensuring its longevity.
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