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Thread: 1976 2002 engine replacement
09-13-2007 06:24 PM #1
1976 2002 engine replacement
I have a 1976 2002 the E-12 engine is toast, Someone gave me an option of replacing it with a 1977 320 engine. Anyone every done this, heard of it, pros cons anything I should know. He mentioned the intake and exhaust would also have to be replaced, will this add a ton of labor?
09-14-2007 01:17 AM #2
09-14-2007 08:55 AM #3
Re: 1976 2002 engine replacement
Well, I'm part way into exactly what you are doing. I bought a rebuilt M10 engine from a guy who did a rebuild for a 77 320i but owner never picked it up - he just wanted to get rid of it and so the price was good. $300.00 deliver charge from Wisconsin to Virginia. I have the paperwork and can see the valves, seats, and guides - fresh, lubed - sweat.
The factory nomenclature stamped on the 320i engine/block/head are same as 2002.
I pulled the intake injection off (thought about running 2002 with injection but was told delivery lines from gas tank can't handle the injection pressure) so am going with the intake/carb from my worn out 02 engine. I have tii headers already and will use them with the newer trimmer 320i heat sheild for the spark plug wires.
The ONLY major issue I've encountered thus far is the cylinder head for the 320i was not drilled from the mechanical fuel pump (the space is there and it is the same 2 litre m10 engine, minus the holes)- thus will have to get an electronic fuel pump.
Here is a photo on Flickr website:
09-14-2007 09:04 AM #4
09-14-2007 01:59 PM #5
09-14-2007 03:02 PM #6
09-14-2007 10:39 PM #7
09-15-2007 02:29 PM #8
09-16-2007 11:48 AM #9
You only want 3-5 psi, also keep the factory by-
pass valve (item # 14).
09-18-2007 05:12 PM #10
I used one from Jeg's which also came with a nifty
wiring kit with relay. The only problem was that it had no automatic shut-off. It always worked better than the mechanical pump in my opinion. It's in the trunk, and I replaced all the plastic fuel lines, which run through the interior, with steel. I don't need it anymore.
09-18-2007 05:29 PM #11
Engine swaps are tougher than they sound (long)
I'm doing an m42 from a '91 318is into my '76 '02. It has required replacing the steering box with the R&P from a 320i and rebuilding the steering column, a major re-engineering job. I've fabricated the engine, trans, and rack mounts from BMW pieces so they look stock, had a driveshaft made from the E30 and the '02 pieces; I'm building the exhaust, and then there's the fuel delivery, radiator, wiring...Of course I had to rebuild the engine with all new seals and gaskets, clean everything and polish the aluminum bits...It just goes on. I have tried to do this on a budget, using parts from the E30, from my E24 which I've dismantled for another project(1970 240Z), and from the '02, but still I've probably spent two grand. Sure, I enjoy doing this stuff, but be careful as you plan your swap. I think the E12 should be relatively straightforward, but be prepared for some surprises. I feel I am a fairly accomplished mechanic for my own purposes with a nice garage and plenty of tools, but still, I wonder why I get myself into these things. I'm not trying to talk you out of doing it, just give yourself plenty of time and money, and if you have a "significant other" to contend with, be sure that person understands your dream. I'm lucky; my wife loves cars and pushes me to finish what I start. Good luck
10-10-2007 02:21 PM #12
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