Porsche 911 Project

[MAXELHOFF]

Well done!

Distributor Sorcery!

[kingston]

You fabbed a distributor ? Awesome

All I did this weekend was bypass the thermal fuse on my central lock CU and fry all my actuators :/

Ooops! Sorry to hear that, Jeff!

[jeffnhiscars]

You fabbed a distributor ? Awesome

All I did this weekend was bypass the thermal fuse on my central lock CU and fry all my actuators :/

[11SportWagonX]

Subscribed. I'm really missing my 89 3.2 G50 right about now.

[kingston]

Good Lord! Very impressive, man! I absolutely cannot wait to read more!!

[evandael]

love it! true wrenching right there.

[LJ851]

So one of the main issues of removing Motronic off the 3.2 engine and going to carburetors is that i also lose the ignition system. Porsche Motronic is basically the same as the early E30 Motronic, it uses a speed and reference sensors on the flywheel and has a "distributor" that only distributes sparks. Porsche actually kept the distributor body to do this instead of a rotor on the end of a cam like BMW choose to do. All of the triggering and timing curves happen via the ecu which i am removing.

I could convert the engine to a standalone crankfire ignition which isn't cheap and changes the look of the engine a lot. I chose another route.

I have a couple Bmw M20 323 distributors so i took one apart and was surprised how similar it was to the electronic Porsche distributor off the original 3.0 engine (which i cant use cause it spins the wrong way)

Heres what i did.


This is my stock 3.2 unit. The advance weights in there are just to keep the rotor lined up with the terminals when the ecu advances the timing. Notice the 3 bosses cast into the inside of the housing and the hole that bolts the dist down .




I machined the inside of the body to accept the electronic internals from the bmw 323 distributor .





Electronic Porsche distributors have the coaxial cable exiting the dist pointing right at the fan housing so it has to turn a 90 degree corner immediately and they tend to fail there, big surprise! I wanted the connector to be hidden and have room to take a gentle turn.

With the bmw unit had the same problem. The winding is held on by 3 screws so i could turn it in 120 degree increments. That however would not give me access to bolt the unit to dist body (asymmetric bolt pattern).

I found one combination that worked if i redrilled two of the mounting holes in the base and then clearanced the unit for the new location of the connection.

Trimmed for clearance



New pattern drilled, i'm using the one original hole on the right and two new holes.



I tack welded the two halves together since i won't have vac advance.



I cut a hole in the dist for the new connector outlet location and inserted a nut insert thing from the 323 dist. You can also see the slot i cut for timing adjustment.



With that done the next move was to modify the upper portion of the dist shaft to accept the bmw trigger. I started with this, it actually had a 4 cyl lobe for points on it, more indication all bosch dist's from the era are basically the same. That's the trigger i need to fit in the pic.



Done machining for fit and circlip grooves.



I also modified the main shaft to change the amount of advance the dist had. I settled on 10 degrees at the dist which is 20 at the crank.



Here is the finished shaft assembly.



Here is the finished assembly. I took this to a friends shop who let me use his vintage Sun Distributor Machine to check the advance curve. I spent a lot of time and ended up with BMW 2002 advance weights, mercedes 6 cyl advance springs and a pretty good advance curve.







ACTION!!

[jeffnhiscars]

This I want to watch

[N2MYE30]

Another killer build that not an e30. Geez, way too much win here. :up:

[F34R]

Hellooooooo R888s. I love the feeling when you first get a set of those. :D

I need to experience this someday.

[Wh33lhop]

Hellooooooo R888s. I love the feeling when you first get a set of those. :D

[LJ851]

Went to the tire shop today. Put the trusty old Scout to good use, it's so nice to have a truck again.




Ended up with this. 225/45/16 F and 245/45/16 R on 16x8 in the front which are rear wheels from a 944 Turbo and 16x9 in the rear which are 930 Turbo rear wheels.






Can't wait to try these out!!

[LJ851]

Awesome, build man. Love the carbs. Get any pictures of the old beat engine taken apart?

Unfortunately i didn't shoot any pics, wish i had.

Awesome... btw what model year is your 911sc?

Thanks, it's an '82 chassis.

I dont get the tittle but sweet build man

Thanks for reminding me, i've been meaning to change it.

[Eljosh]

Awesome, build man. Love the carbs. Get any pictures of the old beat engine taken apart?

[JCarp90]

This shit has to stop. I've been so tempted by 911s lately...