cpbeasley

So if I understand correctly, the new c350 is getting somewhere around 305hp and like a 7200rpm redline?

So, I hear direct injection has been added.

What has been done to accompany the increase in redline? Valvetrain? Rods? Bearings? Approx 1000rpm increase, unless MB prepared the c350 for this abuse beforehand, something certainly has been strengthened?
Pardon my ignorance of OHC motors, but are there valve springs? Id think these would otherwise be the first thing to need beefed up.

Any ideas?

Whatever the case, my 3.5L that could is getting whatever spa treatment the new c350 is blessed with come hell or high water

Boom vang

I think that the mentioned 3.5 putting out 305hp is from a new family of engines with direct injection from the M276 rather than a reworked M272.

http://en.wikipedia.org/wiki/Mercedes-Benz_M276_engine

The first line of the second paragraph really scares me.

Also the M271 lives on as that has been re-worked with Turbo power with more hp and lots more torque (201/229). It will be replacing the existing 2.5L and 3.0 M272 as the upcoming base engine for the facelifted 2012 C class. It offers the same acceleration 7.1 sec but giving an extra 4mpg. Lets hope they get the cam sensor problem solved for this engine.

4 bangers are the engine of the future as they need to extract as much power from the smallest plant while saving on weight and fuel consumption. (even F1 is going to 4 cyl engines) The next gen 1 and 3 series will have 3 and 4cyl engines!

LILBENZ230

The M271 is the new turbo I4? Oh snap.

I'm pretty sure at this point they will have corrected the cam sensor issue. The M271 is a very efficient engine.

cpbeasley

Hopefully the turbo will "refine" it a little more so it's not quite as harsh as the current s/c version.

Where's OneofakindTrini at for this talk of turbos? A turbo thread isn't the same without his presence, as well as an Evo reference! lol

LILBENZ230

Forgive me for my ignorance but what does a S/C have to do with refinement of an engine? It isn't a technical thing by a long shot but I prefer superchargers over turbochargers because of sound. Man I love the whine. Cale, you have been in the C230K cars, right? Not just parroting Glyn on this?

cpbeasley

Per my quotations around the word refine, I was simply referencing, taking it as Gospel anytime you, or the omniscent Glyn... mentioned this trait of the m271; I have never ridden in a m271!

Being that inline engines are supposed to be quite smooth, I chalked it up to the belt driven supercharger and their slight lack of efficiency compared to a turbo.
So, I said "hopefully" the new turbo setup will improve it.

e1000

Yes the w204 will be using the new M276 engine. There is a M272 variant that makes 305hp that is non-DI.

LILBENZ230

The M271 isn't offensive. My car probably needs new engine mounts at this point but when I bought it at 25,000 miles the engine was very smooth for a four cylinder.. on par with the K-series Honda engines but not nearly as smooth as Toyota's now-defunct 5S-FE 2.2L I4.

I'm hoping that down the line when I replace the mounts it will restore the smoothness overall. It has lost some of it with age, no doubt.

ambit

I read on here once someone refering to the M271 as sounding like a tractor motor. Since I've owned 2 now I agree

FrankW

the M272 version would be the E35 from the SL350. 302hp and 7200rpm redline. you would think the M272 would last a while, but MB likes to change the engine every 6-7 years and the M272 is going to be 6 yrs old.

W203E35

IMO Turbo spool sounds much better than a supercharger whine. Turbos are much more efficient as well. With the advancements with bearings the once hated "lag" is slowly starting to fade.

For the M271 I think the turbo move from benz is to make the vehicle more efficient with more power.

OneOfaKindTrini

Exactly, upsizing power while downsizing displacement. Lets see how this one runs with the 335i N54/N55 turbo gas engines from the Bavarians..

New technogolies in bearings and oiling systems have made turbochargers even better and more economical.

LILBENZ230

The N54 twin turbo has no turbo sounds that I have ever heard under any circumstances. But the M271 has an audible whine.

I applaud Benz for making the W204 class competitive with 300hp. Still, I'm willing to bet it will be no match still for a 335i in performance. Lack of a proper manual is an epic fail, too.

OneOfaKindTrini

Turbo sounds or not it hauls *** in the right gear. There are many DIY's to open up diverter valves on the i/m on e90post that I've seen..

And yeah I'm with you on the manual issue. They won't beat the Bavarians unless they can develop a quick shifting auto that sees its way into more than just AMG's or simply add the 3rd pedal and have getrag design a 6spd

W203E35

+1

What's the deal on the Evo man? Were you guys able to ****** it up?

W203E35

They already have a quick shifting auto. And it goes something like this.....MCT.

http://www.youtube.com/watch?v=FBhoEVSb_wU

P.S. BMW can suck it!!!!

cpbeasley

So, what are the differences to give it 302 and 7200?

OneOfaKindTrini

Nah bro someone working in the yard bought the red one and there was a white MR selling but it sold for 11,500.. way too much for a evo with both airbags deployed. And just my luck that while my car was parked there someone gave me a nice scuff on the side of my right rear 1/4 panel.

OneOfaKindTrini

Yeah, but its for AMG models.

FrankW

as far as i remember. it had different cams and tuning and raising the compression ratio.

the SLK350 got the same engine started in 08 as well i believe. i don't think the slk350 has the dgi, but i could be wrong.

LILBENZ230

Damn straight on the haul *** part. It's got gobs of torque from just off idle all the way to redline. And without a 6MT you're steering rather than driving. Driving, though, is what separates BMW from Mercedes. Both are fantastic, but in different ways.

cpbeasley

Anyone know an MB tech competent enough to know, if not be able to find out the differences aside from educated guesses?

Would I be able to call or e-mail MBUSA and request this info?

e1000

Different compression ratio, different cams, different head, completely revised intake manifold, different tune. This is not an educated guess.

Uh yeah give MBUSA's "pimp my engine" hotline a call. I'm sure a qualified engine builder will get right on that parts list to update your engine.

55fanatic

I lol'd at this....

OneOfaKindTrini

Yeap, the 3rd pedal is really needed to maximize the expierience.