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+--- Thread: Swap OM612 head onto OM617? (/showthread.php?tid=3816)
Swap OM612 head onto OM617? - kbob - 07-24-2012
Is it possible to swap an OM612 head onto an OM617 engine? Are the bore centers, head bolt pattern, cam drive compatible?
Why would I want to? I'm looking for a way to convert to direct injection.
Thanks for all thought, opinions, and comments.
RE: Swap OM612 head onto OM617? - aaa - 07-24-2012
Pretty sure the answer's no.
If you're going to plop a common rail head on there, why not swap in the whole engine?
Unless you mean some other engine. Even if you do find the direct-injected relative of the 617 (om317?), the pistons are different as well, with a chamber in the middle of them instead of the prechamber.
RE: Swap OM612 head onto OM617? - Simpler=Better - 07-24-2012
The easiest way to find out would be buying two headgaskets
RE: Swap OM612 head onto OM617? - raudmees - 07-24-2012
There are more things involved in converting a 617 into 612 than just a head swap.
You will probably need a complete car as a donor anyway so why be on the cheap side and try to save pennies on a block?
RE: Swap OM612 head onto OM617? - Simpler=Better - 07-24-2012
The 617 block is rock solid, that's why!
RE: Swap OM612 head onto OM617? - kbob - 07-24-2012
(07-24-2012, 11:20 AM)Simpler=Better The easiest way to find out would be buying two headgaskets
Brilliant! (Actually, just need the OM612 gasket. I know where to find a 617 gasket.)
Why not a whole new engine The 617 has a reputation as bulletproof. The 617 has 10% more displacement. We already have a working 617. Um, inertia.
Well, why not a whole new engine? Will a 612 bolt up to a 617's transmission and engine mounts?
RE: Swap OM612 head onto OM617? - aaa - 07-24-2012
Are you really talking about a 612? Because you seem unwilling to swap out other far cheaper components (trans, motor mounts).
Plopping an aluminum head on a 617 makes it lose half of its reliability. And the 612 uses the om60x style bellhousing, so you'd have to procure a transmission from that era (they are cheapish).
RE: Swap OM612 head onto OM617? - kbob - 07-24-2012
(07-24-2012, 01:30 PM)aaa Are you really talking about a 612? Because you seem unwilling to swap out other far cheaper components (trans, motor mounts).
Plopping an aluminum head on a 617 makes it lose half of its reliability. And the 612 uses the om60x style bellhousing, so you'd have to procure a transmission from that era (they are cheapish).
Not unwilling so much as ignorant. How 'bout if I phrase the question this way: If I want to put a 612's injectors and ECU into a 1982 car, what's the easiest way to get there?
RE: Swap OM612 head onto OM617? - aaa - 07-24-2012
The easiest way to get there is the entire year 2000+ car as a donor. Then you swap the engine in, then you swap in the ecu and wiring, then you swap in all the little things attached to said wiring like the ignition and the instrument cluster and the transmission, since the ecu won't work without them...
RE: Swap OM612 head onto OM617? - raudmees - 07-24-2012
Also if I remember correctly, the om612 has the combustion chambers in the pistons, but if you manage to mate a 617 block to a 612 head, then the pistons are a relativly small obstacle.
If you want more displacement in a 5 cylinder common rail engine than the 270cdi. Go look for a c30 amg cdi. The stroke in that engine should be 97mm. If choose to go that route, you will need even deeper pockets.
Easiest way to get direct injection and more displacement than 270cdi would be the om602.982 from e290 turbodiesel. It has vp37 injection. Early VAG tdi-s have vp37.
Edit: I must be blind, aaa wrote the same thing about the pistons.