Diesel question - Page 2 - MBWorld.org Forums

May 31, 2014 | 05:04 PM

#26

N_Jay

Out Of Control!!

Joined: Aug 2010

Posts: 12,517

Likes: 628

From: Charlotte NC area

2019 WS222 S450 4-Matic / 2007 W211 E350 4Matic (Sold) / 2008 X164 GL320 CDI

Quote:

Originally Posted by drgeeforce

LOL. I'll bet you love watching Draught Horse racing and Tractor Pulling too!

Not into horse pulls, but there are some interesting engines in the tractor pulls.

Aug 2, 2014 | 04:26 PM

#27

SiRudBi

Member

Joined: Dec 2013

Posts: 219

Likes: 71

From: Bluffdale

2017 AMG C 43 (W205); 2019 E 300 (W213); 2008 ML 320 CDI (W164)

Didn't notice Draught Horse Racing or Tractor Pulling at Le Mans, but there are a few diesels to take note of there!

Aug 2, 2014 | 08:04 PM

#28

Fourdiesel

Super Member

Joined: Feb 2009

Posts: 711

Likes: 11

From: NW corner of CONUS

2008 GL 320 CDI, 2004 VW V10 Touareg TDI

Quote:

Originally Posted by drgeeforce

You didn't read enough I have the Duraspeed which reaches 1300C in less than two seconds. 850C is the minimum temp where air is superheated by a 25:1 compression ratio and the addition of diesel fuel starts the combustion process. Very selective reading N_Jay... are you a lawyer?

Not sure where the 25:1 compression ratio comes from. The Mercedes info I have indicates that , for the OM642 engine, the design compression ratio - based on the physics of bore, stroke and combustion chamber design - is between 15 and 16:1. That allows the starter motor to have lower load, smaller current draw, longer life and all kinds of other benefits. It is made possible because of the very high response frequency of the piezoelectric injectors.

Aug 5, 2014 | 02:53 PM

#29

drgeeforce

Member

Joined: Oct 2012

Posts: 140

Likes: 4

From: California

2010 GL350, 2005 BMW X5 4.8is, 2015 BMW 328d

Quote:

Originally Posted by Fourdiesel

Sorry, that number came from my indirect injection days where it was common to see 20-25:1 ratios. I was using basic diesel facts where compressing the air to a very high pressure allows for lower ignition temps for glow plugs.

Aug 18, 2014 | 11:31 AM

#30

theeld

Newbie

Joined: Apr 2011

Posts: 10

Likes: 0

honda accord

Quote:

Originally Posted by drgeeforce

Magazine racing? Diesels are not racers, although we have upgrade kits to improve performance, just like the gassers.

Kleeman's KD box can upgrade the HP: http://www.kleemann.dk/Performance/tuning/Kd-box

JEGS has the PowerPuck: http://www.jegs.com/i/DiabloSport/31...FQWTfgodhJQANw

RENNTech has ECU kits: http://www.renntechmercedes.com/www/catalog/360

BRABUS has a 0-60 in 7.1 sec kit: http://www.brabus.com/en/raster.php?...94&kategorie=9

Dont forget about this tuner, they are widely known among the JEEP/Sprinter community as those variant share the om642, I have confirmed in the past that they have great tunes for ml/gl320 cdi (07, 08)
http://www.greendieselengineering.co...do?method=home

Aug 18, 2014 | 03:00 PM

#31

alx

MBWorld Fanatic!

Joined: Dec 2004

Posts: 4,268

Likes: 254

Quote:

Originally Posted by Fourdiesel

actually with 16:1 static and 24 psi of boost (at full tilt) you get about 43:1 compression at sea level...

Aug 18, 2014 | 03:05 PM

#32

N_Jay

Out Of Control!!

Joined: Aug 2010

Posts: 12,517

Likes: 628

From: Charlotte NC area

2019 WS222 S450 4-Matic / 2007 W211 E350 4Matic (Sold) / 2008 X164 GL320 CDI

Quote:

Originally Posted by alx

actually with 16:1 static and 24 psi of boost (at full tilt) you get about 43:1 compression at sea level...

Only if you assume a perfectly free flowing intake system.

Aug 18, 2014 | 06:38 PM

#33

Fourdiesel

Super Member

Joined: Feb 2009

Posts: 711

Likes: 11

From: NW corner of CONUS

2008 GL 320 CDI, 2004 VW V10 Touareg TDI

Quote:

Originally Posted by alx

actually with 16:1 static and 24 psi of boost (at full tilt) you get about 43:1 compression at sea level...

As I recall, the question I was answering mostly concerned starting issues. With that assumption, compression when running or at max turbo performance are not very relevant.