The Honda B18 engine is a 1.8-liter inline four-cylinder engine that was produced from 1982 through 1985. It was used in the Honda Accord and Prelude models, among others. The engine has a displacement of 1,834cc and produces 195 horsepower at 8,000 rpm and 170 ft-lbs of torque at 7,200 rpm.
Engine type: inline four-cylinder
The Honda B18 engine is a four-cylinder, inline engine. The word “inline” simply means that the cylinders line up in a row from front to back. The word “four-cylinder” refers to an internal combustion engine with four cylinders, of course—two pistons per cylinder, each operating on its own crankpin.
The longer description of the B18 Engine’s design is that it has two cast iron blocks with aluminum heads and valve covers in between them. It uses a single overhead camshaft (SOHC) per bank and has three valves per cylinder—two intake valves at 90 degrees apart and one exhaust valve directly opposite one intake valve.
This engine runs on regular unleaded gasoline at 87 octane or higher (91 octane if you want maximum performance). It was built by Honda specifically for use in small cars like yours!
Bore x stroke: 81.0mm x 87.2mm
B18 Engine: The bore and stroke are the dimensions of the cylinders, which determine how much air can be moved through the engine. The bore is the diameter of each cylinder and the stroke is from top to bottom—it’s what differentiates an 8-cylinder engine from a 6-cylinder engine. A long stroke means that you can make more power with less displacement (and vice versa).
- 834cc is the displacement of the engine. This is the volume of air/fuel mixture that is drawn into the engine to be compressed, ignited and then expelled as a result of combustion. The larger the displacement, the more powerful an engine will be.
Compression ratio: 9.7 to one
The compression ratio is the ratio of the volume of the combustion chamber to the volume of the cylinder when the piston is at the bottom of its stroke. It can be calculated by dividing a cylinder’s volume (cylinder volume) by its displacement (volume).
Compression ratios are usually expressed as a number between 8 and 12, with higher numbers indicating higher pressures. A typical gasoline engine has an average compression ratio between 9 and 10:1, resulting in a combustion pressure around 150 bar (2,500 psi). Diesel engines have much higher compression ratios; they need to ignite diesel fuel without spark plugs, which means they require greater pressure for ignition than gasoline engines do. Diesel fuel self-ignites at 450°F (232°C) or less under high pressure—about 30 times what it would take for gasoline to self-ignite!
Horsepower @ rpm: 195 @ 8,000
The Honda B18A2 engine is a VTEC-EFI (variable valve timing with electronic fuel injection) DOHC inline-four engine. It has a cast aluminum block and head and an aluminum intake manifold. It produces 195 hp at 8,000 rpm and 170 ft-lbs of torque at 7,200 rpm in naturally aspirated form (with the VTEC system active). The compression ratio is 9.0:1 and it uses regular 87 octane gasoline as its fuel source.
The Honda B18C1 engine was used in their 1990s era Accord, Prelude and Integra models.
Torque @ rpm: 170-ft. lbs. @ 7,200
Torque is the force that turns the wheels and it’s a measure of engine power. It’s what makes your vehicle move forward, so if you have low torque, your car won’t accelerate very well. Torque is measured in Newton-meters (nm). The higher this number, the greater the amount of force an engine can exert when accelerating (i.e., getting up to speed).
Honda B18 engine specs
- B18A Engine. The B18A engine is the most commonly used Honda S2000 engine, created in 1999 and 2000. It has a 1.8L displacement with a DOHC 16-valve design, and produces 160 hp @ 7800 rpm and 140 lb-ft @ 6300 rpm of torque.
- B18B1 Engine, B18C1 Engine: These engines are identical to the B18A1 but were produced in 2001 instead of 1999 or 2000 (B18B) or 2002 instead of 2001 or later (B18C).
- B18A1 Engine, B18A2 Engine, B18A3 Engine: The initial version of this engine was produced between 1998 and 2000 with a displacement of 1.8 liters; horsepower varied depending on model year—it was at 161 for the 1998 model when it debuted but increased to 161 by early 1999 before dropping back down to 158 by mid-1999 for most years thereafter until production ended around 2002.*
The Honda B18 engine specs are very impressive, especially when you consider the fact that this engine was made in the late 70s. With a displacement of 1,834cc and 195 horsepower at 8,000 RPMs, it is one of the most powerful engines ever built by Honda Motor Company. It also has a torque rating of 170-ft lbs @ 7200 RPM which means that it will be able to handle any load thrown at it without breaking down or slowing down too much due to lack of power.