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New motor for old car
Old 01-17-2009, 11:29 AM   #1
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New motor for old car

Well my old motor was giving me trouble starting when the temperature dropped. So instead of figuring out the 35 year old fuel injection system, I just swapped in a newer motor. Its been to cold to go golfing and since I'm retired I had time to give it a shot.

Here is a pic of the old motor. And a pic of the new.

The old motor had 140hp and the new around 250hp, so that should be a noticable improvement. And it fired right up with a touch of the key. I just finished and I was worried about the wiring of the computer stuff and some of the modifications I had to do to make it work. I still have a few things to do before its road ready, but I was just excited that it started.

The car is a 1973 Porsche 911 and the newer motor came out of a 88.
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Old 01-17-2009, 11:48 AM   #2
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Voof! Nice nice nice! Think you'll notice the extra ponies? Visually cleaner looking engine compartment too. BMW crowd seems pretty convinced the pleated stock paper air filter does a great job and that the oiled gauze allows too many and too large particulates - though many run it anyway for room or extra sound-of-power considerations..

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Old 01-17-2009, 11:56 AM   #3
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dm, that's a very nice looking car. Even with my ME degree, I wouldn't have the guts to tackle something like that. That's 15 years difference in engine age vs vehicle age. Did it require new engine mounts, exhaust modifications, etc.? My SIL would take on something like that but not me. I don't have the patience to put up with all the problems that certainly came along, especially electrical. Congrats on a nice looking job and the first firing-up.
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Old 01-17-2009, 12:12 PM   #4
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Same motor mounts and I used the exhaust from the 73. On the exhaust I only had to change the studs from the engine as they were a different length, and I welded on a 02 bung.

The scary part was I had to cut notches in my transmission for the sensors on the newer motor to see the flywheel. I was worried that I may crack the case. And I had to change the fuel pump. The wireing was also a consern as the newer car has a computer that sends power to the fuel pump and adjust the timing, injectors, ect. But I had the harness from the new motor and the engine was pretty much plug and play. It was the wires running to the fuse box that took some sorting out. But there was only 6 of them and I only needed 3 hooked up.

I need to modify my accelerator rod slightly, for some reason its now to short. But its just a rod with a ball on the end of it so that shouldn't be much of a problem.

Ive been working on this for a few hours a day for a week and I'm just glad it started. The rest is easy.
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