So the CIS on our 190 has been giving me **** since we bought the car. It's an old, worn out, and been poorly treated through it's life, as most K-jet systems are. I'm starting to think that EFI would be the best long-term CIS solution. I will also say that any stand alone system is beyond my budget, even Megasquirt.

I've been pondering a swap to Bosch LH 2.2 from a Volvo 240/740. The M102 and the Volvo B230 appear to be similar engines. Both are single cam, 2.3 liter 4 cylinders. The big difference seems to be with the compression ratio, the B230 being 9.8:1 and the M102 is something like ~9:1 (?). I'm pretty sure I could keep the Mercedes ignition, since the Volvo ignition and fuel systems are relatively divorced.

So there's one big question to start with: Is this a viable swap?

I know the big hurdles will be the wiring and the intake manifold. I'm more concerned at this point if this will work in theory, I can sort out all the practical stuff later. Is the compression ratio difference a big factor? Lh 2.2 is batch fire and not that advanced of a system, but I don't think there's much room for tweaking.