Comments on: Mercedes Benz DiesOtto inline-4 engine concept

By: emma

emma — Thu, 09 Feb 2012 19:04:10 +0000

thank you for the images shown.

By: Pierre

Pierre — Fri, 25 Jun 2010 09:58:25 +0000

marketing horsepower and number, basically a diesel engine is HCCI ready with a larger torque reading, it wouldnt be such a worry to run diesels had the manufacturers gone hondas way or utlizing aluminium to close the engine weight gap between diesel and petrol engines.to give a more acceptable imagine to the petrolheads. aluminium too requires more wall thickness and is softer than iron resulting in better knock sound dampening or absorbing…the hcci is complicated, critical and sporadic in nature…very very unstable yet volume for volume a diesel will still produce high brake means effective pressure…although not horspower since it is slow burning resulting in limited rpm

just look at jaguars numbers;
Jaguar XF 3.0 Diesel S Portfolio. Engine 2993cc, V6. Power 275bhp @ 4000rpm. Torque 442 lb ft @ 2000rpm.

Performance: 5.9sec 0-62mph, 155mph, 42.0mpg

ahead of the desotto….again….a hevy engine

borneo

By: Mercedes Benz F700 Concept to debut at Frankfurt

Mercedes Benz F700 Concept to debut at Frankfurt — Tue, 14 Aug 2007 06:27:01 +0000

[...] of some sort. Instead, the Mercedes-Benz F700 will be powered by the recently announced 1.8 liter DiesOtto engine, capable of power outputs of 238 horsepower and 400Nm of torque, yet using less than 6 liters of [...]

By: proton.GL..

proton.GL.. — Fri, 27 Jul 2007 09:48:23 +0000

good idea jamesbong,
but under engine heavy load/high revs the fuel injection occured during intake stroke,
if delaying intake valve closure during compression stroke it might pump out some of the mixture to the intake manifold,
well this works fine in miller cycle engine since its the intake manifold is in pressurised by the supercharger,

this is self ignited combination, is to belived more fuel saving then direc injection,
thats why they re trying,
but i agree with you, it add to the complexity, since compression ratio need to be varied, while its not needed in direct injection,

By: jamsbong

jamsbong — Fri, 27 Jul 2007 08:23:10 +0000

One of the easy way to reduce compression is to delay the intake valve timing. so effectively you’ll get smaller capacity output. However, judging from the incredible power output. I also wonder if they are using some other technique.

It seems that petrol direct injection is off, if you guys seen the complicated system that is employed in a volkswagen FSI, you’ll really question why go through so much trouble?

By: Paul Tan

Paul Tan — Thu, 26 Jul 2007 19:51:47 +0000

ingolstadt: they have not legally changed their name yet, so it remains daimlerchrysler

By: ingolstadt

ingolstadt — Thu, 26 Jul 2007 15:38:57 +0000

fantastically rough engine i would assume.

BTW Paul, DaimlerCHRYSLER ? Ain’t it shold to Cerberus? Should be Daimler Benz again right?

By: proton.GL..

proton.GL.. — Thu, 26 Jul 2007 07:49:02 +0000

-from car scoop-
â€œLike most European automakers, Mercedes has already accomplished creating economical diesel units as clean and as powerful as gasoline engines. Now Mercedesâ€™ next goal is to make the gasoline engine as frugal as a diesel unit. The â€œDiesOttoâ€ concept, which incorporates the foremost strengths of both the petrol and diesel engines, is the first step towards that goal. The DiesOttoâ€™s package includes technology features such as direct gasoline injection, turbocharging, a variable compression ratio, a hybrid module with an integrated starter/generator and most importantly, the controlled auto ignition, a highly efficient combustion process similar to that of a diesel.â€———carscoop-july 25th 07

—————————————–
proton GL said,
April 17, 2007 @ 4:19 pm
cold start combustion is easily resolve with some kind initial ignition, or glow plug, etc.
my doubt is the capabilty for higher speed engine, theres a posibility a preignition happened before TDC due to heat built up, which destruct the engine,
due to non regulated ignition, they might want to have somekind of variable copression ratio in relation with engine speed or load, perhaps a small clyinder/piston built in the chamber to alter volume of the chamber hence the reduce the comp ratio for extreme condition,
—-(previous discussion found pauls rave and rants,)
—————————————————————-

so,suprisingly Mercedes did say about â€˜variable compression ratioâ€™ which make possible of controlled auto ignition, and sparkplug ignition under load variation of engine load, (lower compression tuned for spark plug ignition when engine in higher load )
just wonder how they execute this variable compression ratio mechanically ..

By: silverfish

silverfish — Thu, 26 Jul 2007 07:11:30 +0000

Award winning engines are for engineers and geeks to wank over. It doesn’t necessarily equate to better (relatively) consumer experience.

By: BanyakMasukWorkshop

BanyakMasukWorkshop — Thu, 26 Jul 2007 06:36:05 +0000

fantastic engine

By: Paul Tan

Paul Tan — Thu, 26 Jul 2007 01:50:30 +0000

szw: that is because it does not exist yet

By: szw

szw — Thu, 26 Jul 2007 01:49:18 +0000

yet , its not an award winnig 5.0L engine…

By: ys

ys — Thu, 26 Jul 2007 01:31:59 +0000

very impressive engine and the house power / torque.. awesome for a 1.8liter machine dude.
6 liters for 100km is among the best in this category.
RM1.92×6 = RM11.52/100km ~ RM0.115 per km.
come close to 1liter engine fuel consumption.

i would say this will bring big impact to the autoworld as ppl now talking about hybrid etc…
Good job Mecs.. but what will be the price? not many malaysian can affort this laa.