MFI re-conversion from Webers
 

The project on my 1969 911E has begun, converting from Webers back to MFI. I have owned the car since 2005, oddly enough I picked it up the Monday after the F1 Indy tire war debacle. Anyway, I sourced all the necessary parts and have had them in some big boxes for about 18 months and a move from Hawaii back to the Mainland.

Started the project this past Saturday. Took the boxes down from the top shelf and laid out all the goods!

Some photos of the initial stages follow:

http://forums.pelicanparts.com/uploa...1364955402.jpg
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Some shots of the Weber set up before:

http://forums.pelicanparts.com/uploa...1364956092.jpg
http://forums.pelicanparts.com/uploa...1364956117.jpg

http://forums.pelicanparts.com/uploa...1364956213.jpg

Tear down and build up:

http://forums.pelicanparts.com/uploa...1364956469.jpg
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http://forums.pelicanparts.com/uploa...1364956691.jpg

The "dent" in the air filter housing is necessary to clear the A/C condensor.

Webers with no where to go...


http://forums.pelicanparts.com/uploa...1364956772.jpg
http://forums.pelicanparts.com/uploa...1364956799.jpg

I had the car taken on a flatbed to the mechanic to change the cams. A PO had changed cams to some without the extension to drive the gear for the MFI pump.

Overall, a pretty straight forward process. Would like to have known that some things went on before others due to space constraints but it was nice couple of afternoons.

If all goes well, I may make the trek to Wash DC this summer in the 911E.

Enjoy!

Ummm, isn't the mechanic going to need to remove all that to put the new cams in??
Also, what about the injectors? Were the heads tapped and capped? Won't you need to swap heads?? (Unless the previous owner left them and just plugged the opening)
Also, is your mechanic MFI versed? Can he calibrate the whole system?
Finally, was the pump you got one that was on that size engine originally?

And the gear on the back of the driver's side cam with the cog belt that drives the MFI pump?

Likely you will need to pull the engine to get the MFI all correctly installed, buttoned up and running?

Are the throttle bodies in good condition? And what about the MFI pump as mentioned above?

Also you may need a different electric fuel pump that feeds the MFI system.
It is a special hi pressure unit....likely different than the lower pressure one used for carbs.

You'll love the end result tho.
Good luck with the project.

Heads were capped. Plugs were removed and injectors installed. No need to take all the MFI equipment off since the cam towers are outboard of the heads.

New pump specifically for MFI will be installed as well. Just did not have time to do it myself. Plus, it will be easier for the garage to do it while car is in the air.

Correct on dropping the engine. The cam gear will also go on after new E cams are installed / timed.

Sorry for silly question: Is anything wrong with the Webbers to keep them?

Webers were the ultimate carb (before PMO improved even over those) but MFI gives superior drivability (cold starts) and a few more ponies (not sure if that will apply to E cams..)

The downside is the MFI weighs a lot more (and worse, is slung out in the rear of the car).

You can also pretend you are driving a diesel tractor as that is where Pooschey got the pump...

PS....your coil needs to be centered on that bracket that's holding it.
Shouldn't be holding the coil way out on the end like in your pic.

SmileWavy

http://forums.pelicanparts.com/uploa...1365022391.jpg

Replate that hardware while you're in there!

The coil placement is correct for an A/C car. Otherwise it will hit the condenser.

So, is is better to have PMO if you are building a track car?

I'd probably go for MFI - you have to for some vintage race classes.

Be careful with the cold start circuit. I have a 67S with a 71S motor. It has a momentary button or switch for the enrichment circuit for cold starts. The air cleaner shooting fuel down the stacks have burned more than one Porsche severely.
I'm getting ready to go back to MFI on my 72. Sent the pump to Robert at Fairchilds for a freshening.
Good luck with your conversion.