[W126 Coupe] tornado air twister

[RONNY GEENEN]

I just talk with a friend in Holland who happened to be a chief engineer on 
several Dutch ships and he told me the same story. Not more diesel fuel but 
more efficient burning. Most modern ship engines start with diesel and when 
at sea switch over to heavy pre-heated and filtered oil. These kind of 
combustion engines use often turbo charging.
Again one of the well known is the Sulzer engine. The one I work with had 
1200 HP per cylinder. It was a 10 cylinder engine used in a 70,000 tons oil 
tanker.

Ronny

----- Original Message ----- 
From: "Chiappinelli, Joseph" <joseph.chiappinelli at mirant.com>
To: "RONNY GEENEN" <ronny.geenen at verizon.net>; "Mercedes Coupes Mailing 
Lists" <mbcoupes at mbcoupes.com>
Sent: Saturday, April 02, 2005 8:48 AM
Subject: RE: [W126 Coupe] tornado air twister


Ronny,
Don't know much about marine engines but my guess is they are not subject 
to the same strict emissions laws that cars are. To meet emission limits, 
the "burn" in an automobile engine must be very complete, i.e., very little 
if any excess unburned fuel that would prevent it from passing hydrocarbon 
limits. Any increase in combustion air by any means must be accompanied by 
a proportional increase in fuel to create the "ideal" combustion mixture 
required for clean burning. My VW GTI turbo, for example, has a mass air 
flow sensor (MAF) that measures the amount of air being supplied to the 
engine and sends signals to the engine management computer that regulates 
the amount of fuel needed. Of course, the computer is also sensing things 
such as engine temperature, air temperature, barometric pressure, load, and 
engine RPM just to name a few all for the purpose of keeping the ideal 
stoichimetric mix of air to fuel for efficient, clean combustion. These are 
all based on maps stored in the computer's memory for any combination of 
conditions. I had my computer re-flashed with a new set of maps by one of 
the popular aftermarket tuners which has boosted the hp/torque from a stock 
180/170 to 237/250 simply by allowing the turbo to provide more boost and 
the fuel management system to provide more fuel according to the new set of 
curves in the program.
J.Chip

________________________________

From: mbcoupes-bounces at mbcoupes.com on behalf of RONNY GEENEN
Sent: Sat 4/2/2005 12:45 AM
To: Mercedes Coupes Mailing Lists
Subject: Re: [W126 Coupe] tornado air twister



J.Chip wrote:


Uh...a few basics. For combustion engines to produce optimum, clean power
from an air/fuel mixture, that mixture must be at or close to an ideal
ratio. Forcing more air into the combustion chamber (i.e., turbo or
supercharging) than is normally drawn in by the volumetric displacement of
the piston moving in the cylinder (normal aspiration) will only produce
more power if the engine management system can measure the increase in air
and provide additional fuel to maintain the proper air/fuel ratio. That
said, for any given correct F/A ratio, a gain in the efficiency and speed
of the burn can be made by designs that atomize the mixture better. Some
combustion chambers are designed to "swirl" the mixture for presumably
better atomization. Even the physical placement of the spark plug has a
measurable effect on the efficiency of the burn. Once the burn or
combustion explosion takes place the force pushes the piston down against
the resistance of the mechanical inertia it is trying to overcome. Part of
that resistance is the backpressure of exhaust gases that must be pumped
through the exhaust manifold, and exhaust system. Properly designed headers
and free flowing exhausts reduce the back pressure and the amount of energy
wasted on pumping exhaust gases. This leaves more energy to do the work of
"moving the mechanicals".


To create more power in the cylinder you add more intake air by turbo
charging. That is correct. But you do not have to provide additional fuel,
because not all of the fuel in a normal combustion engine will burn. The
efficiency of a combustion engine as you also know is not very high.
At least that is the situation with 4 and 2 stroke engines on ships. I have
been a ships engineer for more than 10 years on Dutch oil tankers.

Ronny

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