Instead of reviving an old post talking about water injection, I thought I would ask those using it give us an update. I am 80% done with the set up I am putting together for my 1984 300D, initially I was going to use the EGR blank off plate on the intake, but someone PMed me and said the water will migrate only to the #1 cylinder, I am wondering how since the water will in a fog form when it is induced.

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1984 300D, 1972 LT1 Corvette, 2014 Artic White 3LT/Z51 C7, 2013 650i Convertible BMW, 1994 Kawasaki Vulcan, 1992 Yamaha Seca II and 1996 Dodge Ram 2500.

That doesn't make sense. If its a mist the water is carried by the air to all cyls.

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CENSORED due to not family friendly words

What are you trying to accomplish with the water injection?

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'83 300D, 126K miles.

X2

I can't say that is true for sure ,but the physics sound right to me. The first cylinder doesn't get all the air either.



I am interested in water injection too. Is there a decent place to research homemade ideas using readily available parts?

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I could not own any MB without the help from you...fellow forum members.


83 300td 207,XXX

Water injection and Methanol/Water help cool EGT's so you can run harder without burning valves. It is used in many high output and high performance diesel appications.

Is the EGR plate before, or after the turbo? I can hardly remember. If you inject after the turbo, you will need to have something capable of overcoming the boost pressure, if you inject before, you will want a very fine spray so you don't create impeller sag. I am also throwing around the idea of water injection for my car, I am going to be starting on the project shortly, I will let you know how it goes.

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1984 300sd auto with 246,000 miles

i was reading up on this just a few days ago. looks like mcmaster carr has the nozzles cheaper than buying them from a company that sells kits.

McMaster-Carr

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1982 300sd from craigslist $800 greased on one tank with NO CONVERSION in the Hot Texas Sun. (currently dead & awaiting engine damage investigation and/or longblock swap)
new daily: '03 vw 5speed jetta tdi wagon. bagged&chipped

EGR is taken before, injected after.

Other than that I don't know anything about Water Injection.

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68 280SL - 70 280SL - 70 300SEL 3.5 - 72 350SL - 72 280SEL 4.5 - 72 220 - 72 220D - 73 450SL - 84 230GE - 87 200TD - 90 190E 2.0 - 03 G500

Nissan GTR - Nissan Skyline GTS25T - Toyota GTFour - Rover Mini - Toyota Land Cruiser HJ60 - Cadillac Eldorado - BMW E30 - BMW 135i

for cross reference:

http://www.peachparts.com/shopforum/diesel-discussion/315059-water-injection-again.html

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1982 300sd from craigslist $800 greased on one tank with NO CONVERSION in the Hot Texas Sun. (currently dead & awaiting engine damage investigation and/or longblock swap)
new daily: '03 vw 5speed jetta tdi wagon. bagged&chipped

I'm in the early stages of thinking about WI and I've seen a lot of opinion regarding cylinder #1 getting the bulk of the water. I don't think that's the case, but here is my thinking.



At any point in time, only one intake valve is going to be open. If that's the case, then the intake is acting like a direct pipe from the turbo outlet direct to the cylinder with the open intake valve. At that moment, the intake is functionally equivalent to a pipe approximating one of the numbered paths. It's as if the other paths don't even exist. So assuming we're injecting at least a mist (and preferably a fog) of water (represented by the yellow arrow), there is not going to be any appreciable build up by cylinder 1/2.

Further, even if there were, any time the valve is closed on 1 or 2, water getting to that valve would be vaporized immediately and carried along the path.

It's not unlike a basic gasoline fuel injection system using port injection (one injector per cylinder) where the gas is injected into the intake port right at the intake valve where it vaporizes any time the valve is closed. (Note: surprisingly, most fuel injection systems inject fuel based on a duration per revolution not based on timing the shot for when the intake valve is open. All injectors fire at the same time for the same duration)

The standard water injection systems work essentially the same, except that it's a fixed amount of water being used, independent of rpm (although by using a pressure switch, there is guaranteed a minimum rpm and air flow based on the turbo generating that pressure) that has to exist before water is injected.

So my conclusion is that using the EGR port as the point of water injection is appropriate and would not generate any significant disparity in water getting to each cylinder, particularly 1 or 2.

What say you?

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Current Stable

• 380SL (diesel)
• Corvette C5
• Manx
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• F350 Powerstroke
• Auburn Boattail Speedster replica

I have been looking for a way to add an intercooler to my 85 300D. It lools like I have to turn or move somehow the turbo. Perhaps a water injection might be the answer.

I was thinking of removing the 16psi switch from the over pressure circuit and putting in a 10-12 psi switch. Having it drive a pump, through a jet into the intake manifold.

I used to run water alcohol system on my 78 renault. It required hi test fuel and there wasn't any where I lived.

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85 Merc 300D - Unwinding 31 years of wear
86 VW TD
Mahindra Diesel
Iseki Diesel

In 2007 I didn't own a diesel.

I say your logic is sound.

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You can't always get what you want, but if you try sometime you just might find you get what you need.

Why don't you just spray into the output side of the compressor housing (right after the wastegate port) or in the connecting pipe? Then you don't have to worry about uneven distribution.

I only ran my setup for a short period of time. Alcohol mixed in gave noticeable power, with EGT rises. Plain water didn't seem to have much of an effect-but I'm sure my timing/injector pop was off too.

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No merc at the moment