Could someone let me know if I'm correct in saying that the 617 motor uses Direct Injection? If not, which type? Thanks.

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1989 300E 144K

It's indirectly injected, into prechambers.

Also, a lot of us prefer the injection into pre-chambers. Mercedes did it to keep noise down. It has the added affects of preventing a nailing injector from burning a hole in a piston. Also, I think it reduces polymerization under some whacky WVO situations.

Yes, it's great, it's rugged, all that. Direct injection is slightly more efficient, though.

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1982 300CD Petrol/Black Leather

I was asking so that the answer might aid the research I've been doing on the effects of WVO on these engines. I'm asumming that DI sprays the pattern directly into the CC, correct? While IDI sprays the pattern into the prechamber, which relays it into the CC. If this is true, it would explain the claim of DI being more efficient, for there is one less variable involved. Thank you, guys.

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1989 300E 144K

...and in that case, what does TDI stand for?

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1989 300E 144K

due mostly to the fact that the combustion can expand directly onto the piston. with PC combustion must flow through the PC tube or whatever orifice it uses to pass into the CC.
I do like the piston burn protection and ... "quiet" combustion? anyway.
John