Announcement

Collapse
No announcement yet.

Porsche 911 Project

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

    #46
    Another killer build that not an e30. Geez, way too much win here. :up:

    COTM

    Comment


      #47
      This I want to watch
      Seat Shocks....I have passed the baton to John Christy from Ninestitch. Email John or Garrett at ninestitch1@gmail.com

      https://www.r3vlimited.com/board/sho...86#post4944786
      Alice the Time Capsule
      http://www.r3vlimited.com/board/showthread.php?t=360504
      87 Zinno Cabrio barn find 98k and still smells like a barn. Build thread http://www.r3vlimited.com/board/show...20#post3455220

      Comment


        #48
        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!!



        Last edited by LJ851; 08-08-2014, 05:35 PM.
        Lorin


        Originally posted by slammin.e28
        The M30 is God's engine.

        Comment


          #49
          love it! true wrenching right there.

          Comment


            #50
            Good Lord! Very impressive, man! I absolutely cannot wait to read more!!
            Originally posted by LJ851
            kingston is the play by play announcer for this thread.
            ‘Tis by the grace of God that my cars run!

            Originally posted by unloadedak
            #teamross
            Siobhan's Build Thread - UPDATED!

            Comment


              #51
              Subscribed. I'm really missing my 89 3.2 G50 right about now.
              87 BMW 325e Black
              09 BMW X5 48i Alpine White
              13 BMW 640i Gran Coupe Mineral White Metallic
              11 Porsche Cayman S Arctic Silver

              Comment


                #52
                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 :/
                Seat Shocks....I have passed the baton to John Christy from Ninestitch. Email John or Garrett at ninestitch1@gmail.com

                https://www.r3vlimited.com/board/sho...86#post4944786
                Alice the Time Capsule
                http://www.r3vlimited.com/board/showthread.php?t=360504
                87 Zinno Cabrio barn find 98k and still smells like a barn. Build thread http://www.r3vlimited.com/board/show...20#post3455220

                Comment


                  #53
                  Originally posted by jeffnhiscars View Post
                  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!
                  Originally posted by LJ851
                  kingston is the play by play announcer for this thread.
                  ‘Tis by the grace of God that my cars run!

                  Originally posted by unloadedak
                  #teamross
                  Siobhan's Build Thread - UPDATED!

                  Comment


                    #54
                    Well done!

                    Distributor Sorcery!
                    grain of salt:p


                    http://https://youtu.be/H8gOAzYchAE:ot:

                    Comment


                      #55
                      Distributors confuse the hell out of me....and you made one. Made props. Love seeing updates on this build!
                      91 318is M50 swapped
                      05 Honda Pilot

                      24V swap thread
                      http://www.r3vlimited.com/board/showthread.php?t=302524

                      Comment


                        #56
                        I made a stool once.
                        Are Three Vee



                        Dad Spec

                        Comment


                          #57
                          That's impressive

                          I've seriously been thinking of selling the Mtech to fund a 911 build.

                          Good work!
                          Suspension tips here...
                          http://www.r3vlimited.com/board/album.php?albumid=757

                          sigpic

                          Comment


                            #58
                            Thanks guys!


                            One thing i have going back and forth on is wether or not to drill and tap my brand new fancy manifolds so i can use my 4 channel sync gauge to get the carbs sync'd as optimally as possible. Most porsche guys use air flow type sync tools that fit in the mouth of one carb barrel and swap it back and forth.

                            This is not ideal in my opinion and i am used to syncing many carbs together on motorcycles so i made the decision to mod the manifolds and try to match the look and quality of the carb setup.

                            I marked each port in exactly the same place and set up a jig to hold the manifolds square in the drill press.



                            I drilled a pilot, countersunk the hole, drilled to size, and tapped a 5x.8 thread.



                            All three done.



                            Left side manifold done.



                            I'll screw in fittings to use while syncing but normally there will just be plugs in the holes. I took some stainless screws and massaged the heads of them until i was happy to use as blanking plugs. Here is the end result, i tried to show the fitment in the pics.






                            One step closer.
                            Lorin


                            Originally posted by slammin.e28
                            The M30 is God's engine.

                            Comment


                              #59
                              And two shiny parts sexier
                              Late model granitesilber 325i convertible FS:
                              http://www.r3vlimited.com/board/showthread.php?t=293701

                              Comment


                                #60
                                I keep hitting refresh and have been getting let down every time.

                                Comment

                                Working...
                                X