The VTEC system on engines like the K20A3 only operate on the intake cam; at low rpm only one intake valve is fully opened, the other opening just slightly to create a swirl effect in the combustion chamber for improved fuel atomization.

Nov 12, 2016 · The only thing different from JDM base K20As and USDM K20A3s are the intake cams. The base K20A has a 3 lobe intake cam. USDM K20A3s have only 2 lobe cams. The USDM ECU can be used on the base K20A. It doesn't matter …

The K20A4 is the same K20A3 but tuned for USDM 2003-2007 Honda Accord and 2002-2006 Honda CR-V. The K20A6 is another version of the K20A3 that was produced for the European and Australian 2003-2006 Honda Accord.

Jun 9, 2022 · In this article, we discuss the Honda K20A3 engine. That includes K20A3 specifications, K20A2 vs K20A3 comparison, and K20A3 reliability

Honda K20A3/K24A. A USDM only production engine, the K20A3 and similar cylinder head configurations were developed for a performance, yet economical mindset. Although VTEC, it is only featured on the intake camshaft. The K20A3 is found in the 01-03 Civic Si while the K24A1 is in the 01-03 CR-V.

Apr 11, 2023 · This model is based on the K20A3 for the USDM 2003-2007 Honda Accord and 2002-2006 Honda CR-V. The K20A3 roots are made more evident by the performance figures too, as the A4 has the same compression ratio of 9.8:1. However, it produced even less power, making only 150 horsepower at 6,500 RPM and 140 lb-ft of torque at 4,000 RPM.

A USDM only production engine, the K20A3 and similar cylinder head configurations were developed for a performance, yet economical mindset. Although VTEC, it is only featured on the intake camshaft. The K20A3 is found in the 01-03 Civic Si while the K24A1 is in the 01-03 CR-V.

Jan 30, 2023 · If you’re keen on safely turbocharging or supercharging your K20 engine swap project car, then the K20A3 is the right choice for you. Another advantage with the A3 is that of early torque; it makes 142 lb-ft at 4000 rpm — 2000 rpm sooner than the A2 motor which makes the same torque at 6000 rpm.

Mar 4, 2006 · At low RPM, the K20A2 uses a normal cam profile to retain a smooth idle, good fuel economy, and good low-end power delivery. At 5800RPM, its VTEC mechanism engages a high-lift, long-duration "race" cam profile to increase high-end power delivery.

Dec 17, 2022 · Is the Japanese base k20a/a3 the same as the USDM k20a3? If I do buy a JDM motor, does it drop into the USDM model? The K20A and K20A3 are extremely different engines. The K20A (assuming you mean the performance one) revs over 8k and only comes with a manual. The K20A3 is much less of a performance engine and was available with an auto.