New V6 and V8 units will be added to the Mercedes range from this summer; more power and torque
5 May 2010

A new range of more powerful, torquier and more frugal V6 and V8 petrol engines will be introduced across the Mercedes range from autumn this year.

The headline changes for the V6 are a new narrow-angle block and for the V8 a reduction in capacity mated to twin-turbo induction.

See pics of Mercedes' new V6 and V8 engines

Both vee-engines also get third-generation direct injection with piezo-electric injectors, revised combustion, multi-spark ignition and low-friction ancillaries to cut fuel consumption by up to 24 per cent.

Major changes are wrought to the V8, which gets a new, smaller-capacity block of 4.6 litres, reduced by 15 per cent from the 5.4 litres of its predecessor, together with the addition of twin turbochargers, arranged with one blower for each bank of cylinders.

Peak power goes up to 429bhp, a 12 per increase, while torque is boosted 32 per cent to a whopping 516lb ft.

“The driver experiences the same pleasant and effortless performance from the new V8 as that delivered by a mighty, naturally aspirated 7.0-litre engine,” says Mercedes.

In the CL500 - the launch model this autumn - fuel economy improves by 22 per cent to 29.7mpg, with CO2 dropping by an equally impressive percentage to 224g/km.

The addition of turbos also spread the V8’s torque delivery across a wide rev range, Mercedes claiming that the “driver perceives no turbo lag” and that “an outstanding 442lb ft is available between 1600 and 4750rpm”.

The new V6 will feature in the S350 from the autumn and the CL350 from the winter. A significant change is a new block, which moves from a 90-degree vee angle to a more ideal 60-degree vee, which reduces vibration and allows Merc to drop the balancer shaft, cutting weight.

Still naturally aspirated, the 3499cc V6 nevertheless matches power and torque increases with better fuel economy and lower emissions.

Stop-start technology, which cuts consumption in traffic, is employed for the first time on a multi-cylinder Merc engine.

Peak output rises to 301bhp, up from 268hp, while torque rises to 272lb ft from 258lb ft. Merc says this torque peak is available from 3500rpm up to the 5250rpm red line.

But the major improvements are to fuel economy and CO2 output. In the bulky S350, the new V6 is claimed to be capable of 37.1mpg - a 24 per cent improvement - and 177g/km.

“These figures make the new V6 the benchmark in its segment for a comparable output,” says Mercedes.

Julian Rendell

See all the latest Mercedes reviews, news and video

Join the debate

Comments
27

5 May 2010

Peak output rises to 301bhp, up from 268hp, while torque rises to 272lbft from 258lbft. Merc says this torque peak is available from 3500rpm up to the 5250rpm red line.

Is 5250 correct? is it a diesel?

However i have to say they are very impressive numbers

5 May 2010

5250rpm redline??? that is awful. i hate non-revvy cars. itl be like driving a slightly gutless multi cylinder diesel... eurgh.

5 May 2010

i think it was about 5 years ago when the nissan 3.5 v6 was 300bhp.

so the power is very disappointing contrasting to the impressive mpg and emissions.

5 May 2010

[quote lotusfan]5250rpm redline??? that is awful. i hate non-revvy cars. itl be like driving a slightly gutless multi cylinder diesel... eurgh.[/quote]

- 'cept you trust Autocar's cack-handed write up and spin Merc-hate off it. Neat.

The rev number quoted, as most would have spotted, is the top end of the peak torque range, 3,500 - 5,250 rpm. Going by the old 3.5 V6 peak power should come in around 6,500 rpm.

5 May 2010

[quote beachland2]

i think it was about 5 years ago when the nissan 3.5 v6 was 300bhp.

so the power is very disappointing contrasting to the impressive mpg and emissions.

[/quote]

Believe it or not there are still some differences in makers of cars. Merc have obviously aimed for max torque, max fuel efficiency and max stress-free driving philiosophy with these new engines, the V8s particularly. The twin turbo V8 is tuned for huge, lowdown torque and high fuel efficiency. The naturally aspirated V6 in the S350 does more than 10mpg more than the similarly powerful 3.7 V6 in the Infiniti G series, a smaller and lighter car.

The V8 is sensational and whilst the V6 is currently overshadowed, later turbocharged versions will redress the impressiveness in specific output terms balance.

These engines, once fully rolled out into the E- and C-classes, will put Merc on eye-level with BMW's excellent engines. Too bad all this technical wizardry and outstanding human achievement may be about to be wrecked by the blood-sucking vampires, intent on putting the proles into neo-serfdom.

5 May 2010

37mpg and 300bhp is truly impressive. Shame there is the usual waffle from members who have no idea how to drive a high torque engine.

5 May 2010

224 g/km from a 429 bhp petrol V8 is incredible - that's the same as an ST Focus

5 May 2010

[quote Autocar]A new range of more powerful, torquier and more frugal V6 and V8 petrol engines will be introduced across the Mercedes range from autumn this year.

The headline changes for the V6 are a new narrow-angle block and for the V8 a reduction in capacity mated to twin-turbo induction.

See pics of Mercedes' new V6 and V8 engines

Both vee-engines also get third-generation direct injecti...Read the full article[/quote]

I'm sorry, but a V6 simply will not do. V6s are heavy, complex and unrefined, and, I believe, more expensive to produce, compared to the altogether much nicer straight-six. Don't use packaging as an excuse, as BMW have stuck to straight-sixes, yet the 5-series is as spacious and as safe as the E-class.

5 May 2010

"Stop-start technology, which cuts consumption in traffic, is employed for the first time on a multi-cylinder Merc engine"

..... those one cylinder units in the lower range models never were popular.....

And whilst we are on the topic of typos, the peak torque may stretch to 5250rpm, but for the power to be 301bhp this must arrive at 5800rpm of more. Anyone at Autocar know that torque x revs / 5252 = power???

5 May 2010

Wow. Those figures are bloody fantastic.

Pages

Add your comment

Log in or register to post comments

Find an Autocar car review

Driven this week

  • Lexus LC500
    Car review
    20 October 2017
    Futuristic Lexus LC coupé mixes the latest technology with an old-school atmospheric V8
  • Maserati Levante S GranSport
    First Drive
    20 October 2017
    Get ready to trade in your diesels: Maserati’s luxury SUV finally gets the engine it’s always needed
  • Jaguar XF Sportbrake TDV6
    First Drive
    19 October 2017
    The handsome Jaguar XF Sportbrake exhibits all the hallmarks that makes the saloon great, and with the silky smooth diesel V6 makes it a compelling choice
  • Volkswagen T-Roc TDI
    First Drive
    19 October 2017
    Volkswagen's new compact crossover has the looks, the engineering and the build quality to be a resounding success, but not with this diesel engine
  • BMW M550i
    First Drive
    19 October 2017
    The all-paw M550i is a fast, effortless mile-muncher, but there's a reason why it won't be sold in the UK