Honda K20A / K20Z
2.0 L · inline-4 · naturally aspirated · petrol · 2001–present
Also known as: k20a, k20a2, k20a3, k20a4, k20z, k20z1, k20z2, k20z3, k20z4, k20 i-vtec
Honda's naturally aspirated 2.0 i-VTEC — the K20A and K20Z — in the Civic Type R, Integra Type R and Acura RSX.
⚑ It is not the K20C turbo that replaced it and has its own page here, and it is not the K24. Three K-series engines, three pages, and the letter is the only place the difference is written.
Its i-VTEC combines variable lift with variable cam timing, and the failure that matters presents as the engine simply not changing character above about 5,800 rpm. Low oil level, a clogged solenoid screen or a failed pressure switch all produce it, and all three are cheaper than what people assume. Check the oil and the screen first.
It is chain-driven, which removes the belt anxiety that defines the older Honda families — but the chain tensioner rattles on a cold start at high mileage and is worth acting on.
These engines are swapped constantly, and a stamped code on a rebuilt one may not describe what is inside it. Confirm the build before trusting a compression ratio.
Cars fitted with this engine
4 generations, across 2 makes. From the authored catalogue — an absent car means the catalogue has not reached it, not that the engine was never fitted.
Acura
Information, not instruction
CarGeek is a reference, not a service manual. Its pages are written from public sources and from what other people have found, never from a manufacturer's own service information, so they can be wrong or incomplete for your particular vehicle. Some of what they describe carries real risk: high voltage, fuel under pressure, stored energy, hot and moving parts.
Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
Posted about this engine
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What makes one worth reading:
- The car — make, model, year and engine. The same fault behaves differently on each.
- What you measured, not only what you replaced.
- What actually fixed it — or that nothing did, which is worth knowing too.
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