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1985 300D Gone 1985 230CE Perfect, 1984 300TD Driver, 1981 300TD Bad engine
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1,418 Posts
Discussion Starter #1
Has anyone here added propane, NOS or water/methanol injection to their 300D?
 

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74 450 SEL, 78 300D, 99 Ford 7.3 turbo
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97 Posts
WHAT IS YOUR OBJECTIVE: HIGHER PERFORMANCE, OR SAVINGS BY USING ALTERNATIVE FUEL

I am now running ultrafiltered 80% used motor oil, 20% gasoline ($0.75 per gallon cost, for the gasoline) to equal performance of ULSD in my '78 300D. This is for fuel cost savings and flexibility, as well as for fun. I have done numerous fuel conversions to meet government air quality mandates, gasoline to gasoline/CNG and gasoline/propane, diesel to diesel/CNG and diesel/propane. I have considerable racing background using nitromethane-alcohol, and gasoline-NOX. I would stay away from NOX in a diesel engine, detonation becomes a problem. CNG and propane can be used to displace diesel. By adding either to the intake stream (using a gas carburetor or calibrated valve) the governor will cut back on the diesel to maintain the same power output. Ignition is still by diesel, but gas can provide significant clean burning energy without damage to the engine. Some of the largest gas engines run this way. If you are running a turbocharger, you are already pushing the mechanics of the 300D pretty hard, but increasing the boost by only a couple of PSI and adjusting the fuel injection pump to allow more fuel to be injected will greatly increase power and torque at the expense of engine and drivetrain life. There are many faster cars out there than the MB. What are you trying to do?
 

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1985 300D Gone 1985 230CE Perfect, 1984 300TD Driver, 1981 300TD Bad engine
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1,418 Posts
Discussion Starter #3
I am looking for better from stop performance and reduction of smoke during hard acceleration.
 

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1985 300D Gone 1985 230CE Perfect, 1984 300TD Driver, 1981 300TD Bad engine
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1,418 Posts
Discussion Starter #4
allsafe

You seem to know about this. I was hoping that you could add more.

To help from off the line performance I am thinking about adding a switching valve that would be attached to a pressure tank. This would add pressure to the ALDL to pump in more fuel. NOS would be injected at the same time to help burn the extra fuel.

Am I on to something or just on something?
 

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1985 300D Gone 1985 230CE Perfect, 1984 300TD Driver, 1981 300TD Bad engine
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1,418 Posts
Discussion Starter #6
I would definitely start by taking the ALDA totally out of the equation and completely remove it. I did and I like it.
Do you have any posts that talk about how and why?
 

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74 450 SEL, 78 300D, 99 Ford 7.3 turbo
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97 Posts
Commuter: It will work the way you describe, but proceed slowly. Adjust the ALDA to the maximum tolerable black smoke output, then add nitrous. The nitrous kits are available from Jegs online. Get used to a very light foot for cruising around town to control smoke and save the N2 O for those special moments. N2 O is pretty expensive. Keep up the posts.
 

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1985 300D Gone 1985 230CE Perfect, 1984 300TD Driver, 1981 300TD Bad engine
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1,418 Posts
Discussion Starter #8
I din't explain my whole plan in the last post. It is my intention to have it switch operate normally after the turbo spools up. What I described was to help to get it off the line.
 

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1985 300D Gone 1985 230CE Perfect, 1984 300TD Driver, 1981 300TD Bad engine
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1,418 Posts
Discussion Starter #10
While driving around and watching the tach using full throttle from a stop, I remembered that this 1985 300D should have a 2200 RPM stall torque converter. I am seeing that it is locking-up closer to 1700-1800 RPM. This is probably why my off the line performance is so weak.

I remember reading that a malfunctioning SPRAG will cause this. I should check into this before adding anything.
 
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