Any ideas on what the exhaust temperature on a diesel should or could be... I shot about 10 areas on a 190D 2.2 with a temperature indicator gun... The engine has just been driven about 20 miles and idled for about 5 minutes and the engine temp was a hair above 90 C. I got 190 where the coolant came out of the head/block and went in the top of the radiator, about 190 where the coolant came out of the head/block and went in the heater, about 160 where the coolant came out of the bottom of the radiator.. I did those shots to check the gun because the highest temp on the exhaust manifold was 195 and about 160 on the exhaust next to the transmission. I thought the temperatures would be a lot higher... I want to use part of the exhaust to heat used veggie oil... Any ideas out there would be appreciated... Jim

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James A. Harris

90C for an engine temp is OK but are the rest of the temps Fahrenheit? Last time I waved my infrared thermometer over a Mercedes diesel I got 90 to 100C on the radiator, about 60C in the area of the IP, and 160 to 200C on the exhaust manifold.

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"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970

Exhaust temperatures leaving the head will vary from about 350°F. at idle to 1200°F. under maximum continuous load at high ambient temperatures.

Some folks have gone above 1200°F. but, you're literally playing with fire above that value.

the 90C was the guage in the instru. cluster... The rest of the temperatures are F. The ambient temp was about 40F out and it had been idleing for awhile.. But I would think the exhaust header would be well above 190F... I will do some more tests because I want to use the exhaust to heat the veggie oil... Jim

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James A. Harris

Jim,

This example is my truck since I have an EGT gauge but my readings vary from around 200F to 1200+ depending on the load. The temps will ramp up sharply under any significant load but generally hover around 500-600 while cruising down the highway. The exhaust manifold and turbo will glow red hot under load for an extended amount of time.

A diesel is very effecient thermally and it just doesn't generate much heat at idle.

If you're going to mess with modifying the engine for WVO or otherwise, you would be smart to go ahead and invest in an EGT gauge for your car. Teamed with a boost gauge, even in an unmodified car, it's interesting to note the readings and it can also help you drive for maximum economy.

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-Evan


Benz Fleet:
1968 UNIMOG 404.114
1998 E300
2008 E63


Non-Benz Fleet:
1992 Aerostar
1993 MR2
2000 F250

Is a egt guage just a temperature guage, if so I will install it on the fuel line before it reaches the injector pump.. thanks... Jim

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James A. Harris

EGT gauges measure Exhaust Gas Temperature. A thermocouple is installed in the exhaust manifold just downstream of the head. It is a temperature gauge, but is calibrated for very high temperatures, usually up to 1600 degrees. You're going to want to get a gauge with a much lower range if you want to get any meaningful readings of your fuel temperature.

If you're going to be doing any power modifications to the IP and/or turbo, an EGT gauge is highly recommended to avoid damage from high EGT's.

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Dale

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1990 300D 2.5 Turbo -155k
2000 E430 - 103k
2014 Jeep Grand Cherokee Ecodiesel 4x4 - 11k
2014 VW Passat TDI SE - 7k Bro's Diesel
2006 E320 CDI - 128k Pop's Benz

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A pyrometer(EGT gauge) typically measures in 100 degree increments(or higher) and is installed in the exhaust manifold. Are you thinking about running fuel lines near the exhaust manifold?

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'83 300D 198,000mi Howard
'03 Saturn Vue CVT 75,000mi(wifeys)

I think that's what he's thinking of. Don't most SVO systems use engine coolant to heat the oil?

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Whoever said there's nothing more expensive than a cheap Mercedes never had a cheap Jaguar.

83 300D Turbo with manual conversion, early W126 vented front rotors and H4 headlights 401,xxx miles
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