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The compression ratio is the ratio between the maximum and minimum volume during the compression stage of the power cycle in a piston or Wankel engine. A fundamental specification for such engines, it can be measured in two different ways.
Honda's first production V6 was the C series; it was produced in displacements from 2.0 to 3.5 liters.The C engine was produced in various forms for over 20 years (1985–2005), having first been used in the KA series Legend model, and its British sister car the Rover 800-series (and Sterling).
The engine can produce any compression ratio from 8:1 to 14:1. The highest torque is achieved at 8:1, giving high acceleration, while the best gas mileage (fuel efficiency) is achieved at 14:1. The electronic engine controller responds to the pressure on the gas pedal, in real-time, altering the compression ratio seamlessly.
Nissan QR25DE Engine. The QR25DE is a 2.5 L (2,488 cc) variant built with cast steel connecting rods, a steel timing chain, counter-rotating balance shafts, and an aluminum intake manifold. The engine bore and stroke is 89 mm × 100 mm (3.50 in × 3.94 in) and a compression ratio ranging from 9.5:1 to 10.5:1 depending on the vehicle. [2]
This engine features a square 83 mm (3.27 in) bore and stroke with a 10.0:1 compression ratio. This engine was built at the Trenton Engine Plant for use in export market (non-US) Chrysler Neons. It produces 86 kW (115 hp) at 5750 rpm and 151 N⋅m (111 lb⋅ft) at 4950 rpm and meets Euro III emission standards. Applications:
The Honda R engine is an inline-four engine launched in 2006 for the Honda Civic (non-Si). It is fuel injected , has an aluminum-alloy cylinder block and cylinder head , is a SOHC 16-valve design (four valves per cylinder) and utilizes Honda's i-VTEC system.
This engine has a DOHC variable valve timing valve train and a multipoint injection system. The engine had many iterations, depending on the car in which it was installed and the intended use of the car. The M16A engine uses a chain cam instead of a cam belt. General dimensions: 1.6L (Liana) 2001–2004; compression ratio: 9.7:1
The H23A DOHC VTEC Engine is largest displacement in the H Series engines with a compression ratio of 10.6:1. Found in the Japanese 1998-2002 Accord Wagon SiR (CH9). It produces 200 PS (147 kW; 197 hp) @ 6,800 rpm & 163 lb⋅ft (221 N⋅m) @ 5,300 rpm and comes with a "blue top".