Another killer build that not an e30. Geez, way too much win here. :up:
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Porsche 911 Project
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This I want to watchSeat 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
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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.
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Good Lord! Very impressive, man! I absolutely cannot wait to read more!!Originally posted by LJ851kingston is the play by play announcer for this thread.
Originally posted by unloadedak#teamross
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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
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Originally posted by jeffnhiscars View PostYou fabbed a distributor ? Awesome
All I did this weekend was bypass the thermal fuse on my central lock CU and fry all my actuators :/Originally posted by LJ851kingston is the play by play announcer for this thread.
Originally posted by unloadedak#teamross
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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
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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.
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And two shiny parts sexierLate model granitesilber 325i convertible FS:
http://www.r3vlimited.com/board/showthread.php?t=293701
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