Learn more on the Honda City’s 3-cylinder P10A2 engine – Research paper attached
So, there’s the new GN1 Honda City in Thailand with a new engine. What’s so special about it? Is it any good? Let’s first have a glance at its basic specifications…
| Displacement | 988 cc |
| Induction | Forced induction via turbocharger (Borg Warner) |
| Max. Power Output | 122 PS @ 5,500 rpm |
| Max. Torque | 173 Nm @ 2,000-4,000 rpm |
| Bore | 73.0 mm |
| Stroke | 78.7 mm |
| Compression ratio | 10:1 |
| No. of inlet valve per cylinder | 2 |
| No. of exhaust valve per cylinder | 2 |
| Intake valve diameter | 28 mm |
| Exhaust valve diameter | 23 mm |
| Variable Valve Timing Control (VTC) | Dual VTC (Intake and exhaust) |
| Variable Valve Timing & Lift Electronic Control (VTEC) | Intake only |
| Fuel injection system | Direct injection |
| Camshaft | Dual Overhead Camshaft (DOHC) |
| Camshaft drive | Timing belt |
988 cc Inline-3, Dual Overhead Camshaft (DOHC), Variable Valve Timing Control (VTC), Variable Valve Timing and Lift Electronic Control (VTEC) and a single-scroll turbocharger from Borg Warner – everything that comes with the Honda P10A2 engine.
The 3-cylinder engine is, if I’m not mistaken, what you would find in the 1.0-litre turbocharged Honda Civic (for Europe, China etc.). The 1.0-litre turbocharged engine in the Honda Civic is paired with either a 6-speed manual transmission or a CVT.
Now, the idea of a 3-cylinder turbocharged engine is not something new. Some “performance” ‘Kei’ cars had turbocharged three bangers (Suzuki Cappuccino, Daihatsu Mira, Suzuki Alto). Three-cylinders are notorious for their excessive vibration due to the first order vibration of the engine. With 3 cylinders, 1 cylinder is always performing the opposite motion of the other 2 cylinders.
Usually, balancers are applied but in the case of the Honda P10A2 in the GN1 Honda City, a balancer-less system is applied. There’s more information on the P10A2 engine in a research paper by the researchers at Honda R&D, and I have attached that at the end of this article.
The Honda City with such a small displacement will be an interesting car in the Malaysian market. The engine is also a teeny bit complex in my opinion with the presence of both VTC and VTEC. It also seems to incorporate the Atkinson cycle with some manipulation on the valve timing before TDC for the power stroke.
You can access the PDF file here or refer the image gallery below…
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