Power engine of Porsche 997GT3

When it comes to GT3, it is natural to mention the 3.6-liter horizontally opposed engine with extremely high maturity. On the new generation GT3 RS, the same engine is still used. According to the calculation, this 3.6-liter engine has been used for three generations, with a cylinder diameter of 100mm and a stroke of 76.4mm, and the previous generation has been able to output 38 1hp/7400rpm and 39.2 KGM/. In order to obtain better power output, the engineer replaced the titanium alloy connecting rod with a longer length, and modified the height and shape of the piston, so that the compression ratio was increased from 1 1.7: 1 in 1996 to 12.0: 1, plus a newly designed lightweight crankshaft and variable intake manifold. The air intake and combustion efficiency are greatly improved, and the red line speed is delayed to 8200 rpm. When the GT3 Cup racing car was launched last year, the maximum power output was increased to 400hp/7300rpm and 40.8kgm/6500rpm, and the volumetric efficiency easily exceeded 1 10hp/L, which was specially adjusted according to the competition regulations.

The highly mature 3.6-liter horizontally opposed engine has been used in the third generation GT3 cars. After external reinforcement and re-adjustment, the maximum power output can reach 465,438+05hp/7600rpm, 465,438+0.3kgm/5500rpm, and the volumetric efficiency becomes amazing 65,438+065,438+05.3hp/L. ..

When GT3 was officially launched this year, the maximum output rose slightly to 4 15hp/7600 rpm and 4 1.3 KGM/5500 rpm, and the volumetric efficiency became115.3hp/L. Looking at the car world, few car manufacturers can achieve such results. GT30 ~ 100 km/h acceleration of 6-speed manual transmission can be completed in 4.3 seconds. Although GT3 Remote Sensing is also a six-speed manual transmission, the gear ratio is set instead. In addition, even though the weight of GT3 has been greatly reduced from 1420kg of Carrera S model to 1395kg under the highest criterion of lightweight, the RS version is still available. Under the dual advantages of dense tooth ratio and light weight, the GT3 RS 0 ~ 100km/h accelerates from 0. 1 sec to 4.2 seconds, and it only takes 13.3 seconds to accelerate to 200 km/h. Porsche, which rarely uses electronic speed limit, will certainly not limit the speed of GT3 RS to "just" 250 km/h.

According to the information provided by the original factory, the 997 GT3 RS will be listed in Europe in the third quarter of this year and is expected to be sold in North America in March 2007.