I have a 1985 300D turbo. I want to install a pyrometer and I know pre-turbo is better than post turbo, but where exactly? It looks like no matter what I'll have to drill a hole and tap it, but my thermocouple is about 2" long and it looks pretty tight under there, pre turbo. Where have you guys added them? Photos?

thanks

I've read that the EGT probe should be placed the same distance from the head as is the diameter of the exhaust valve. Supposed to be a "rule of thumb" ?

That said, mine's about 3/4" from the head/ manifold junction.

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The Golden Rule

1984 300SD (bought new, sold it in 1988, bought it back 13 yrs. later)

Do you have a picture. It is pretty cramped in there. Did you drill a hole up from bottom? Do you have the stock air filter? How far in does your probe go? I don't want to start drilling and then find out I don't have enough room.

I'd also love to see a few pictures of someone pyrometer install... the engine half please.

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I suggest we solve high gas prices with environmentalists... unfortunately they don't burn well.
1982 300CD, 220K miles: This vacuum system will be the death of me yet! (OBK #26)
1977 F150 400 C6 2wd, 10.2 sec 1/8 mile with 2.75 gears.
1965 Mustang. Mostly stock... LOL!
2001 Ram 2500, cummins, 5spd, 202k miles.(girlfriends)

I'll be putting one in soon too. I'll take some pictures along the way.

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1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver

1982 300SD - 232K miles - Wife's Daily Driver

1986 560SL - Wife's red speed machine

Please do. Since Ill be towing with mine next summer an EGT is a must-have.

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1978 Ford F-150 351M
2002 Kia Spectra 1.8l 5-sp
1985 Volkswagen Scirocco 8V 1.8l 5sp
1985 MB 300D Turbo California

"Die Natur verabscheut Vakuum"