Autombile drives the CLA 45 AMG
06-23-13, 05:08 AM
#16
Lexus Test Driver
06-24-13, 03:56 AM
#17
Moderator: LFA, Clubhouse
The secret is making such an engine that is 1) reliable enough to be feasibly financially backed by a factory warranty, and 2) doesn't frustrate its owners with reliability problems even if it is backed by a factory warranty.
06-25-13, 11:11 AM
#20
Lexus Champion
There's no secret to a 2.0L engine making 355bhp with 26.1 boost. Anyone can make an engine that can do that. Such is proven by the number of aftermarket Evo X tunes that make more hp with lower boost.
The secret is making such an engine that is 1) reliable enough to be feasibly financially backed by a factory warranty, and 2) doesn't frustrate its owners with reliability problems even if it is backed by a factory warranty.
The secret is making such an engine that is 1) reliable enough to be feasibly financially backed by a factory warranty, and 2) doesn't frustrate its owners with reliability problems even if it is backed by a factory warranty.
Anyways, for those who may be a bit worried regarding how pushing too much power and pressure on a small engine may cause damage, those are valid concerns indeed...................BUT I believe that Mercedes Benz and AMG have done their homework and studies those possibilities as well (i.e. extreme heat and pressure).
Also read some quotes on the internet:
If you design an engine from day one to work with 26 psi its not a problem at all. Selecting the proper compression ratio, piston speeds, cooling system, materials and most importantly the combustion system (tailoring the pressure curve) in the proper way can result in a durable engine.
My STi came stock with 19psi of boost, an 8000rpm redline, and forged internals. It would tolerate any kind of abuse with no problems. That was with technology from 13 years ago. As long as you have enough fuel and proper cooling, things should be alright in a well engineered motor. Mine did drink a lot though.
I'm pretty sure 26lbs can be handled today with no problems.
I'm pretty sure 26lbs can be handled today with no problems.
Sounds crazy. But then you have to think about the fact that a car as simple as the Fiat Abarth is pushing 18+ psi, and this MB has forged internals and presumably equal or better engine management, and it's plausible. 355 hp out of 2 liters is no joke!
http://www.autoevolution.com/news/m1...ned-56856.html
06-25-13, 11:07 PM
#22
Moderator: LFA, Clubhouse
06-25-13, 11:13 PM
#23
Lead Lap
06-25-13, 11:29 PM
#24
Moderator: LFA, Clubhouse
Certainly anyone feels safer with MB (and especially AMG) than BMW, but this is new ground even for AMG. Also, MB engines haven't been bulletproof. Even the M156 (which I have touted on this board as an incredible achievement, especially since it was an entirely in-house AMG project) had its reliability concerns.
06-26-13, 07:26 AM
#25
The biggest issue with regards to engine failure under this much boost is simply reduced tensile strength due to heat. As posted, designing from day 1 to handle and remove the heat makes this not much different of an issue than, say, a NA engine rev'ing 9,000 RPM, in regards to the stresses on engine internals.
Anyone remember the R8 mules with the twin-turvo V10? I think all of them burst into flames as Audi simply couldn't figure out how to remove enough heat at a great enough rate. So instead they dumped a NA Gallardo engine into it.
Remember that fuel is exploding inside an engine. Adding boost simply increases the force of that explosion, with a pretty linear increase as boost increases. Heat, on the other hand, has a non-linear reduction in tensile strength.
Anyone remember the R8 mules with the twin-turvo V10? I think all of them burst into flames as Audi simply couldn't figure out how to remove enough heat at a great enough rate. So instead they dumped a NA Gallardo engine into it.
Remember that fuel is exploding inside an engine. Adding boost simply increases the force of that explosion, with a pretty linear increase as boost increases. Heat, on the other hand, has a non-linear reduction in tensile strength.
Last edited by Infra; 06-26-13 at 07:30 AM.
06-26-13, 07:51 AM
#26
Lead Lap
Certainly anyone feels safer with MB (and especially AMG) than BMW, but this is new ground even for AMG. Also, MB engines haven't been bulletproof. Even the M156 (which I have touted on this board as an incredible achievement, especially since it was an entirely in-house AMG project) had its reliability concerns.
06-26-13, 08:47 AM
#27
Lexus Champion
Also to add, MB and AMG have the M275 and M279 engines (which basically are two kinds of 6.0 liter V12 Twin-Turbo engines).............and so far, these seems to be quite robust.
Hence, I believe that AMG was able to learn as much regarding turbo charging
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