EK1 1.8L ENGINE

The EK1 1.8l engine was manufactured by Honda Motor Company between 1979-1983 for the 1st generation Honda Accord, 1st generation Honda Prelude, 1st generation Honda Vigor and early 2nd generation Honda Accord models. It was a water cooled, SOHC 12-Valve CVCC engine with a displacement of 1.8L (1751CC). Output varied as the engine went through two updates during it's production. Most notably was the introduction of the CVCC-II emission setup in late 1980 models. The EK1 1.8l engine was standard in Japanese and US Markets. All other markets worldwide had standard the EL 1.6L engine. Transmission choices were Hondamatic 3spd/4spd or manual 5 speed.

Overview

• Displaced 1.8 L (1,751 cc)
• 77mm bore x 94mm stroke (3.03 in × 3.70 in)
• Cast iron block & aluminum cylinder head
• Three barrel Keihin Carburetor w/ auto choke
• Electronic Ignition
• Liquid Cooled - Thermostat controlled fan
• Electric Fuel Pump
• Oil Cooler (or provision on the block)

1979 - 1980 CVCC Cylinder Head (HF-3)

Six port cylinder head (4 intake ports / 2 exhaust ports) for 1979 (49 states & California) & early 1980 models (49 states only)

Specs

• 8:0:1 Compression
• 72 HP @ 4500 RPM
  • 68 HP @ 4500 RPM w/ Hondamatic '79 & '80 Models
• 94 ft lb Torque @ 3000 RPM
  • 94 ft lb Torque @ 3500 RPM w/ Hondamatic '79 Model
  • 94 ft lb Torque @ 2500 RPM w/ Hondamatic '80 Model

Engine Weight w/ Trans

• 5spd - 338.5lbs (153.5kg)
• Auto - 338.7lbs (153.6kg)

1981 CVCC-II Cylinder Head (PB2)

Eight port cylinder head (4 intake ports / 4 exhaust ports) for 1979 (49 states & California). Introduction of CVCC-II emission system and catalytic converter. Exhaust valve ports were doubled to have a greater resistance with uneven heating.

Specs

• 8.8:1 Compression
• 75 HP @ 4500 RPM
  • 68 HP @ 4500 RPM w/ Hondamatic
• 94 ft lb Torque @ 3500 RPM

Engine Weight w/ Trans

• 5spd - 342.8lbs (155.5kg)
• Auto - 392.6lbs (169kg)

1981 saw the redesign of the auxiliary valve across all 1981 Honda engine families for the CVCC-II update. Aux Collar features five torch holes for mixture burning with a progressive wound spring and thicker valve holder. Piston crowns are dished per the newly updated compression ratio.

1982 - 1983 CVCC-II Cylinder Head (PC1)

Eight port cylinder head (4 intake ports / 4 exhaust ports) with revised intake and exhaust spacing for better heat distribution and exhaust flow.

Specs

• 8.8:1 Compression (9.3:1 debatable per technical bulletin)
• 75 HP @ 4500 RPM
• 96 ft lb Torque @ 3000 RPM

Engine Weight w/ Trans

• 5spd - 351.6lbs (159.5kg)
• Auto - 392.6lbs (169kg)

The newer cylinder head design created a change in combustion efficiency across the board for all 1982 Honda engine families. The intake and exhaust valve angles were slightly changed and the roof of the combustion chamber is lowered by 1.4mm, raising the compression ratio higher. Exhaust valves are slightly longer, but identical in diameter to the PB2 valves. Intake Valves same as PB2 valves. Piston crowns are deeper dished.