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Old 05-07-2009, 04:55 PM
C Sean Watts's Avatar
Join Date: Mar 2006
Location: NC
Posts: 1,318
Originally Posted by Alastair View Post
The following is a quote from Monark Website....

MonarkDiesel GmbH & Co. KG was founded in Hamburg in 1951. We specialise in precision-made injection equipment and have been supplying several leading car and engine manufacturers for many decades. To meet the requirements of our customers and the market, our product range will be continually updated and extended.
Today MD is a modern enterprise which does the customer a service with qualified and experienced employees.

At LEAST 10 years earlier, during WWII, Bosch made the fuel injection-pumps for Messershmidt ME 109 and others and they looks suspiciously similar to the PES types we all know and love....
If we're NOT talking diesel injector pumps, Cadillac-Gauge had them for armor vehicles and tanks prior to the war. They were just too costly to make in mass numbers at the time.

But to answer your question from Wed. I read, learned and saw reams of information at the Magneti Marelli R&D and production facility in NC (USA.) They helped my Univ. SAE team (NCSU) with a one seater race car. We didn't win anything (lost a radiator and barely finished) but Carroll Shelby gave us an innovation award.

1987 300D (230,000 mi on a #14 head-watching the temp gauge and keeping the ghost in the machine)
Raleigh NC - Home of deep fried sushi!
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Old 05-10-2009, 02:05 PM
compu_85's Avatar
Waiting for his Model 3..
Join Date: May 2008
Location: Springfield VA
Posts: 5,174
You guys might find this a good read. FWIW Kerma (Charlie) was the only vendor in the US for Bosio nozzles for quite some time, but now it seems they are coming from alternate sources.

1991 350SDL. 230,000 miles (new motor @ 150,000).

2013 Fiat 500E. 20,000 miles, 80 miles at a time.
2012 Passat TDI. 95,000 miles. More space, power, and fuel economy than the Benz
2004 Touareg V10 TDI. 150,000 miles. One of 450.
1999 Jetta TDI. 310,000 miles.
1992 Jetta ECOdiesel. 156,000 miles. 1 of 48. Sold.
1991 Jetta ECOdiesel. 430,000 miles. 1 of 700. Sold to VeeDubTDI, totaled in front of our house
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Old 09-29-2011, 03:12 PM
rickmay's Avatar
like music to my ears
Join Date: May 2011
Location: Chicago area, soon to be in lower taxed area
Posts: 117
Monark probably wrong injector

Some of you have seen my quest to get my 240D to 40 MPG, highway, and I am wondering if I haven't found the reason why most of these cars are not getting the mileage (and power) that they should be getting.

I have seen another website strongly push Monark injectors. Let me show you the following diagrams, and you tell me what you think. When I saw the spray pattern of the Monark (being wider than the Bosch), it seemed logical that it could be better, until I found out that the injector didn't directly go into the cylinder. Please note first photo PRECOMBUSTION CHAMBER 2

The injection nozzle does not even come close to reaching the cylinder. It stops at the point where NOZZLE REED is pointing to. I want to describe this well, as some may not be familiar with these parts. You can see that the Precombustion Chamber (PC) extends well past the bottom of the injector so it just reaches a little into the cylinder. Note how the piston has a cut out so it does not hit the PC.

Now look at the picture called PRECOMBUSTION CHAMBER Note that the bottom of the PC is closed EXCEPT for the holes on the side.

Now, this last picture put it all together for me. Look at NOZZLE SPRAY PATTERN This is from the Mercedes manual. Note how concentrated Nozzle A is. This is the correct spray pattern for the 240D and 300D. Now, the Nozzle B look deformed, but that is not the point. Go look at the first photo again. It makes no sense to me to use a wide spray pattern with this PC. Much of the fuel will hit the sides of the PC well before the openings at the bottom. Now look at the Mercedes recommended spray pattern. It is concentrated so that most of the fuel directly reaches the bottom of the PC and the holes on its side. Now, this makes sense to me. Not a wide dispersal pattern. The pattern should not dribble or bounce of the sides of the lower PC.


Do you have good combustion? Do you only get 30 MPG on the highway or a little more? I bet this is the reason. Further consider that there are reamers being sold to "ream out the carbon" through the glow plug hole (glow plug is also in Photo PC 2. Consider that this PC is in little cut out between the piston and the top of the cylinder head. Think about 30 years of that kind of abuse. Could it be any wonder that the lower end of the PC could be in very poor condition? I look at these three little holes in the bottom of the PC and it leads me to the conclusion that the harder the spray hits the end of the PC, the better the dispersal pattern will be in the cylinder head. This is what MB designed, and this is what I want.

The only trouble, other than cost? I called Bosch technical services, and I was told that their rebuilds are set to pop at 1450 PSI. This is the minimum standard for Mercedes. I guess I have to rebuild my own using Bosch nozzles at 1650-1675 PSI.
Attached Thumbnails
What Type, (Not Make) nozzles have you tried..???-precombustion-chamber-2.gif   What Type, (Not Make) nozzles have you tried..???-nozzle-spray-pattern.jpg   What Type, (Not Make) nozzles have you tried..???-precombustion-chamber.jpg  

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