雷克萨斯近日公布了RC F运动轿跑车搭载的 5.0 V8引擎细节。这台4969毫升32气门引擎取自先前的IS F车型，但车厂对其进行了综合改进，最大功率提升40千瓦/54马力至351千瓦/471马力，转速也从原来的6800转/分提升至7300转/分。压缩比增至12.3:1以提升在整个转速范围内的扭矩输出，因此峰值扭矩增至530牛米@4800-5600转/分。该引擎绝大部分部件，包括进气，节气门，气缸体，D-4S喷射系统，活塞，连杆，曲轴和VVT-i气门正时系统都是全新的。这台V8引擎采用采用钛金属进排气门，新的高强度锻造栏杆和主轴承材料。该引擎在低速巡航行驶时采用省油的阿特金森循环，而在高转速时采用奥托循环。搭载该引擎的RC F百公里加速时间4.5秒，最高时速270公里，最初400米加速时间12.5秒。

 

Lexus RC F 5.0 V8 engine detailed, generates 471 bhp

Lexus has released additional information about its V8 petrol engine that powers the RC F sports coupe.

 

The 4,969 cc 32-valve unit has evolved from the engine featured in the previous IS F model and the company says comprehensive changes have been made. Maximum power has been raised by 12 per cent or 54 bhp (40 kW) to 471 bhp (351 kW). The rev limit has also been increased from 6,800 to 7,300rpm. Lexus also explains the higher, 12.3:1 compression ratio boosts torque across the entire rev range, with maximum output rising to 530 Nm (390 lb-ft), available from 4,800 to 5,600rpm.

 

Most of the engine’s components are new, including intake, throttle body, cylinder heard, the D-4S injection system, pistons, connecting rod, crankshaft and the VVT-i valve timing. The V8 uses titanium inlet and exhaust valves, new high-strength forged connecting rods and new main-bearing materials. Interestingly, it switches to the more fuel-efficient Atkinson cycle when operating at cruising speeds, reverting to the Otto cycle at higher revs.

 

As we have previously reported, the acceleration of the RC F from 0 to 100 km/h (0-62 mph) takes 4.5 seconds, while the top speed is electronically governed at 270 km/h (168 mph). The 400 m (1/4 mile) sprint from standstill takes 12.5 seconds.