I removed my ALDA a while back when i first got the wagon and it was running poorly, smoking, and all that.

The performance improvement was great and no visible smoke with normal driving in daylight and just a slight haze when flogging it from a standing start so I have continued to drive it without the ALDA.

Today I finally got a project completed to the point where I could do a road test; I have installed a trans temp gauge that I can switch between coolant and trans temp and an exhaust temp gauge.

I did my first test drive today, flat level road, ambient temp low to mid 90s, after several miles of just cruising along at 65-70 mph I stopped and from a standing start just about WOT without holding down the kick down.

Before i reached 70 mph the exhaust temp hit 1000° F.
So I am thinking that some of you that have removed your ALDA and are enjoying the improved performance may be putting your engines at risk, particularly if you live in hilly country and are operating without a pyrometer.

We were warned by a couple of the more experienced members here about this in at least one of the threads about ALDA removal, but I didn't take it too serious, as I am pretty much a gentle driver.

I put the pyrometer on because I am planning to pull a small camper on a 2000 mile trip this fall and I like guages any way.
I have repaired my ALDA so it holds pressure but was enjoying the power, not really thinking much about putting it back on, but I am now going to put it on for sure!
Don

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Red Green "This is only temporary,Unless it works!"

97 E300D 157000 miles
87 300TD ?141k? miles

The only time to get concerned is when the temp hits 1250°F. Dave had exceeded this and ran the engine close to 1400°F., briefly, without any issues.

You don't need to reinstall the ALDA and the additional fuel below the powerband only produces smoke.........not excessive heat.

Where is your EGT probe?

Sixto
87 300D

Some of the big puller diesel engines overfuel to help cooling in the engine.

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Gone to the dark side

- Jeff

Sixto
EGT probe is right at the flange on the pipe that replaced the trap ox little less than an inch from the turbo inlet.

Dave may be that brave to run to 1400f but I am not, even if I didn't have a #14 head I still don't think I would want to exceed 1200-1250.

The 1000° F exhaust temperature reading today was “not towing anything”, on level ground, less than 20ft above sea level and just barely made 70 mph.

Since the ALDA is repaired so it holds pressure, I’m going to put it back on and see how it works.

For now, I’ll just watch that gauge very closely when in any real load condition.
If the ALDA needs to be removed again for good power, it is a simple diy.
Don

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__________________
Red Green "This is only temporary,Unless it works!"

97 E300D 157000 miles
87 300TD ?141k? miles

I was under the impression that the ALDA limits fuel off-boost, not the max fuel of the engine under boost.

__________________

Gone to the dark side

- Jeff

We have EGT on most of our earth moving gear. The EGT when it starts to climb can go very rapid very quick if you are under very heavy load conditions. 1250 is probably a reasonable limit. I would be a bit concerned running an alloy headed motor above that for long. Those sort of temps would definitely remove any carbon build up as well as maybe a bit of metal in time. You risk surface boiling the coolant in the head as well.

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Grumpy Old Diesel Owners Club group

I no longer question authority, I annoy authority. More effect, less effort....

1967 230-6 auto parts car. rust bucket.
1980 300D now parts car 800k miles
1984 300D 500k miles
1987 250td 160k miles English import
2001 jeep turbo diesel 130k miles
1998 jeep tdi ~ followed me home. Needs a turbo.
1968 Ford F750 truck. 6-354 diesel conversion.
Other toys ~J.D.,Cat & GM ~ mainly earth moving

Thats actually very cool. Even by stock standards Mercedes considered 1472*f to be acceptable continuously. (see attachment of a quote from the SAE paper of the OM617a development).

Also, the ALDA has no effect on maximum power or exhaust temperature. Its only job is to prevent visible smoke at low boost.

Not for normal diesels. Rich=hot. Pullers are running several gallons of fuel and water through the engine in just 300 feet, not to mention 200-300psi of boost the whole time.

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I am very interested how you installed your EGT gauge.
I would like to do the same on my 85 300SD running with HHO, all the research I've read are indicating a lower EGT. As low, as 125 degree I would like to verify that on my car.

Can you share your parts list and installation procedure? thank you.

Any places with scientific credibility?

Correct me if I'm wrong but....I'm thinking that an abnormally high EGT is an indication of a stuck or malfunctioning turbo wastegate valve?

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'85 300D Turbo - CA Version

Full load is full load with or without a trailer attached. If you're pedal to the floor going up hill and the turbo is working at its limit you are putting in as much fuel you'll ever get into the car. And air to match, thank you turbo. You should be making maximum EGT and if you see 1000 that is fine for these cars, I say there's more to go. There is no proper functioning ALDA in this equation.

Attach a trailer and repeat the experiment under the same atmospheric conditions. Do you think the EGT will rise even higher, or will the car just slow down and EGT will stay at the same point but for longer... because it takes longer to reach the hilltop?

I'd like to have EGT just for a novelty to put beside my boost gauge. Everyone wants to see how you mounted the sensor, show us!

I was actually thinking of adding a 'press to pass' feature running HOH mist injection, but with methanol for extra power, not just cooling.

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Cheers!
Scott McPhee

1987 300D

1: That has nothing to do with diesels.
2: The volume of hydrogen they use is exponentially higher than any onboard system can produce. 1.42lb/hr compared to the average 0.0228lb/hr (2L/min) production of common hydrogen generator scams.
3: The engine isn't generating the energy to release the hydrogen from its stable water bond, they use premade bottled gas.
4: They are using clean hydrogen, not Oxyhydrogen.
5: Hydrogen "generator" scams have been around for over 100years and not a single one has proven itself to actually work in controlled, scientific and repeatable conditions. The laws of thermodynamics always prevail over flawed ideas and scams.

1.1: Your website has even proven itself to be a scam!
That is a flat out lie that relies on consumer ignorance. A 95% efficient engine would not only absolutely revolutionize the world as we know it but the exhaust would be little more than ambient air temperature and the coolant would never warm up. Since that clearly doesn't happen, your device has been proven false right out of the gate.

olddiesel, is you IP and cam timing correct and have your injectors been serviced recently?

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1995 E420 Schwarz
1995 E300 Weiss
#1987 300D Sturmmachine
#1991 300D Nearly Perfect
#1994 E320 Cabriolet
#1995 E320 Touring
#1985 300D Sedan
OBK #42

1) I think that this thread has gone on long enough considering the OP's EGT is well within limits. If you could only get 800* I'd be telling you to check fuel filters and find out why it won't get hotter.

2) There are enough hydrogen hybrid / scam threads, we need another like we need another oil thread.

__________________

Gone to the dark side

- Jeff