You cannot just drop the later 617 turbo into the W115 chassis -- the oil filter housing is on the wrong end of the block, and interfers with the suspension. I suppose you could make a custom oil filter for it and locate the filter remote (as some 240s are anyway), but stock it just won't go in. You will also have to make the oil cooler hookup work somehow.

I also don't think you can get a turbo in there either -- not enough room between the block and the front suspension. You will have to measure to see.

Too bad, the W115 would be a blast with a turbo 617 in it!

Oh, and by the way, if VW lowered the compression on the deisel with the turbo, Volvo and Audi certainly didn't! Stock compression is 23:1, and it can be as high as 26:1 in production. That's how they get 105 hp and 145 ft/lbs torque out of 2.4L at 10 psi boost.

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!