BY MARK GILLIES
There's been a lot of talk on internet chatrooms lately about whether the new AMG 6.2-liter naturally aspirated V-8 engine is an improvement over the supercharged 5.4-liter V-8 that was an AMG staple—particularly, if the new car is quicker or slower off the mark. Well, the answer is yes and no, at least on the evidence of the CLS63 AMG that we have been stylin' in of late. The 6.2-liter V-8 makes 507 horsepower in the CLS, up from 469 hp in the old CLS55 AMG. Torque is down, though, from 516 pound-feet to 465 lb-ft. More power usually results in better top-end performance, whereas more torque normally means quicker mid-range and off-the-line acceleration.
To a certain extent, that's what our numbers show. The CLS63 gets to 60 mph from rest in a blistering 4.1 seconds, a tenth quicker than the CLS55, but is identical otherwise up to 120 mph and shares a 12.6-second quarter-mile time. The 30-to-50 and 50-to-70-mph figures show the benefits of the supercharged motor's fatter torque curve (2.2 and 2.5 seconds, respectively, compared with 2.5 and 3.1 for the CLS63), while the extra top-end grunt of the 63 comes into play above 120 mph. By 150 mph, the CLS63 is ahead by almost a second and a half.
So, apart from marginally better performance away from a stop light and in go-to-jail-fast territory, what are the benefits of the new engine? Well, it sounds absolutely fantastic, especially as it nears the 7200-rpm redline. (Yeah, that's right: a 6.2 liter V-8 that spins past seven grand.) The loud, guttural growl is a bit too intoxicating, because the desire to hear a blaring soundtrack makes it all too easy to stray into triple-digit temptation. It really does pickup and go past 100 mph.
Read more about this make and model
For more Reviews click here