Honda · Inline-4 · Naturally aspirated
K20A
The K20A is a 2.0-litre DOHC naturally aspirated inline-four produced by Honda from 2001. It introduced Honda's second-generation VTEC system (i-VTEC, combining VTEC cam switching with Variable Timing Control on the intake cam) and became the performance standard for front-wheel-drive platforms of the 2000s. The K20A was fitted to the Integra DC5 Type R, Civic EP3 Type R, and the Honda Stream RSZ. Its high-revving character (8,000+ RPM redline in Type R specification), strong midrange i-VTEC engagement, and close-ratio gearbox contributed to the Integra DC5 Type R's position as the front-wheel-drive benchmark at the Nürburgring in 2004.
Engine specifications
| Displacement | 2.0L (1,998cc) |
|---|---|
| Configuration | Inline-4 |
| Aspiration | Naturally aspirated |
| Valvetrain | DOHC 16-valve (i-VTEC: VTEC + VTC) |
| Fuel system | Sequential fuel injection |
| Power (JDM) | 220 PS (162 kW) @ 8,000 rpm (DC5 Type R JDM) |
| Torque (JDM) | 206 N·m (152 lb-ft) @ 7,000 rpm |
| Redline | 8,400 rpm (Type R) |
Variants
- K20A Type R (DC5/EP3)
- 220 PS JDM, high-compression (11.5:1), titanium connecting rods.
- K20A2 (US RSX Type-S)
- 200 hp US-spec; lower compression, revised cam profiles.
- K20Z3 (US Civic Si)
- 197 hp, further revised; different i-VTEC calibration.
Vehicles using the K20A
- Honda Integra Type R (DC5)
- Honda Civic Type R (EP3)
- Honda Stream RSZ
Common issues
Oil consumption on high-km engines
Cause: Piston ring end-gap opens over time; VTEC passages can accumulate sludge on irregular service.
Remedy: Compression test to assess rings; clean VTEC solenoid screen every 30,000 km.
VTEC solenoid clogging
Cause: Sludge buildup from infrequent oil changes; 5,000–7,500 km intervals minimum.
Remedy: Clean or replace VTEC solenoid; use fresh oil every 5,000 km minimum.
Half-shaft failure (turbocharged builds)
Cause: Stock OEM half-shafts are adequate for NA power; turbo builds exceed their design envelope.
Remedy: Driveshaft Shop or similar reinforced axles on any turbo build above 250 whp.
Tuning ceiling
~270 whp naturally aspirated with aggressive build. Turbo builds reach 350–450 whp on stock bottom end.
Skunk2 or Toda cams, cold-air intake, 4-1 header, ECU tune.
Turbonetics or Garrett T3/T4, 550cc injectors, Hondata K-Pro ECU, front-mount intercooler.
Precision 5858 or equivalent, forged pistons, 1,000cc injectors, full exhaust.
Common modifications
- Hondata K-Pro ECU (most important modification)
- Skunk2 or Toda cams (NA build)
- Cold-air intake and 4-1 exhaust manifold (NA)
- Turbo kit (Kraftwerks supercharger is popular alternative)
- Coilover suspension (Tein, KW)
- Strengthened half-shafts (stock shafts fail above ~280 whp at the wheel)
Frequently asked questions
- What cars used the K20A?
- The K20A was fitted to the Honda Integra Type R (DC5), Honda Civic Type R (EP3), and Honda Stream RSZ. The K20A2 variant was used in the US-spec Acura RSX Type-S.
- What is the K20A's redline?
- The JDM Type R specification K20A redlines at 8,400 RPM, with i-VTEC cam switching occurring at approximately 5,800 RPM for most Type R calibrations.
- How does the K20A compare to the B-series engines?
- The K20A generates more torque across the rev range than the B16A or B18C due to its larger displacement and i-VTEC system (which adds variable intake cam timing in addition to cam profile switching). The K-series platform also accommodates turbocharging more readily than the older B-series due to better oiling and a more accessible engine bay layout in K-swap applications.
Sources
- Honda K20A Technical Service Manual (DC5, 2001)
- Honda Integra Type R DC5 press release (JDM, 2001)
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