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Twin plugging Motronic - Question
I am planning on bumping my compression ratio to 10.3:1 on my 87 3.2 during this winters rebuild. I will be getting the heads twin plugged as well. What options do I have as far as the ignition goes utilizing the stock Motronic fuel injection. Thanks for the replies in advance.
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Mark:
The easiest and least expensive route to twin-ignition on a Motronic-equipped 3.2 is to install a 3.6 dual-distributor & plug wire harness, an extra stock coil, and the Andial Motronic splitter. You need to install the 3.6 distributor crank gear as well but thats cheap. |
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Would you advise cracking it open for this or not? I have the time and the engine only has about 300 miles on it
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crank gears
Steve, the 3.2-3.6 (84-98) are the same for both dist. drive gear and the brass crank gear so he will be fine part #'s 930 602 424 00 is the dist gear, 930 102 112 00 is the crank gear,
We are building 12 pin dist for 911 engines 2.0-3.8 and have done alot of research on this. we also have some custom dist gears made that will tightem up the back lash common with even the new gears installed. we are doing both internal trigger and crank triggered versions. Mike Bruns JBRacing.com |
Sounds like the hardest part of this conversion will be locating the parts. Thanks!
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I have a good 3.6 dizzy here and the Andial splitter if you need it. A good used coil is easy to source. |
Mark, in addition be sure to have a chip designed for the twin plug ignition setup as a 93 octane performance chip for a single plug application would have way too much ignition timing for the motor.
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Andial splitter and the Supertec twin plug distributor.
Looks great, works better. We can build the twin plug distributor using your stock 3.2 Carrera distributor. http://forums.pelicanparts.com/uploa...1161136292.jpg |
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That would mean I need to buy another chip from you:D Thanks for the advise |
Re: crank gears
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You only get back lash if you miss match the early dist gear (2.0-2.7) with the late crank gear (3.2-2.6). |
back lash
You are fortunate, and I know the difference in the gears early vs. late. we see the timing wiggle on most all of them some up to 5-6 deg visible on the dyno with a timing light.
check a few distributors installed with a dial indicator at the tip of the rotor, and I dont mean the advance mech. or set one up in a case half before assy. Mike Bruns JBRacing.com |
Re: Twin plugging Motronic - Question
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964/993 distributor (bought on ebay for $220, patience can be a virtue) new dist. drive belt, vent kit, caps & rotors (so I had a maintenance baseline but you may not want/need to do this) Andial signal splitter 2nd Bosch ignition coil (part number 944 602 115 00 or 00 055) Custom fabricated alu bracket to hold both coils Custom Magnecor wire set (just call them with wire lengths you require and they'll build to spec or simply make your own wire set) 2nd set of lower plugs (still use stock WR7DC) Custom made nylon wire separators Lower Plug hold-down clips (probably not necessary in most instances but looks nice) Twin-plug heads & lower valve covers http://forums.pelicanparts.com/uploa...1161139037.jpg http://forums.pelicanparts.com/uploa...1161139103.jpg http://forums.pelicanparts.com/uploa...1161139270.jpg http://forums.pelicanparts.com/uploa...1161139418.jpg The single distributor/cap/rotor looks clean as well, and maybe make it easier to pass a visual inspection for smog testing if needed? Although I haven't had a problem yet with the 964/993 distributor passing the visual either... Figure on spending anywhere from $1,200 - $2,000 for the conversion pieces depending on how resourceful (or maybe lucky is a better term?) you are with parts availability/selection/negotiation...:) One thing not mentioned and that you should know is that if using the 964/993 distributor with the stock heater blower tube, it will most likely interfere and you will have to "modify" the plastic tube to fit...in my case it was a non-issue... :) Ralph |
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I need to hook up my twin plugged heads too, but it seems my intercooler piping will interfere with the 964/993 distributor, so I need a more "compact" solution. |
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