WTB Bosch CDI

[Schiefer]

Hi from new member
Im soon going to introduce myself and my car (project), but first I have to get it running.. The last month it has been sitting outside a workshop.
The Bosch CDI is dead, and I have borrowed one from my friend and helper here in Norway, Zithlord (John), but would like to deliver it back as soon as possible.
The plan was to upgrade to MSD, but I have now changed my mind. I saw Tom Ching had a couple for sale, but he has not replied to my PMs.
As far as I understand the box I need is standard from approx 69 way past the early years, but to be 110% sure it has to fit a 70S. (part number: 0 227 200 008).
Really hoping for a quick solution. The summer is very short here...

Regards,
Rod, Norway

[Shaun 69 E]

Rod, I have a 001 if that will work for you. Can ship tomorrow if it will.

[orange911]

I have one available, and it is a 3 pin, but not sure of the part number. I will check tomorrow. I guarantee it to be functional. I will be available to ship as early as Saturday if you want it. How about 130 euros plus shipping at actual cost. I ship to Finland a lot and it usually takes small packages a week to 10 days for air mail. 3-4 weeks by ship. Let me know.

[Schiefer]

Thanks Shaun and Olin for quick reply, and for the PMs from a couple of others! It seems like I will get the chance to drive my car this summer after all

But I would very much like to verify it the part number is of any meaning. My old one had 008 in the end, some of you who have replied, have mentioned you have 001. Im a newbee, or newblood and have to take things a little easy to avoid mistakes. Thanks again to you all, this was a nice welcome to the forum.

Best regards!

Rod

[orange911]

The 33-to-120 Ohm changeover occured around the time of the '72/'73 model changeover. An early '73 model, date-coded '227' and the 120 Ohm resistor is original. The date code is stamped on the same side as the 'Vorsicht!' sticker near the lower edge ... with very tiny 2 - 3 mm high numerals. Also found this information.

1. 1965-1968 SWB Tachs. These may have VDO number 333.230/041/002, according to VDO, "this is a old version Tachometer with 24 Volt Square Wave signal from Ignition KL.1."

2. 1969-1970 LWB Tachs. These have VDO numbers 333.230/041/007 to 333.230/041/010. According to VDO, these are driven by an "11 volt square wave." Now, we know that up until around 1971 the tachs were driven from an "intermediate unit" which was a silver can with Bosch part number 0 227 990 001. We know that this contains an inductor that is probably used to simulate the original coil to drive the low-impedance tach. Some of these say "12V 24000 Imp."

3. 1971-1973 Tachs. These appear the same externally but have been altered internally to be driven off the high-impedance circuit between the points and the Bosch CDI box. In the early 3-pin CDI boxes, there is a 33 ohm pullup resistor in the trigger circuit that would allow only around 425 mA to flow in the circuit. The tach must be sensitive to 11 volts and 425mA, which is why the later CDI won't drive the earlier tach off this circuit-- the earlier tach needs higher voltage.

4. 1974-1977 Tachs. I know these were driven off the CDI box, but I don't know when the CDI box changed from an "001" to an "008" or when the cutover from a 33 ohm pullup resistor to a 120 ohm occurred. With 120 ohms the input current is only 116mA so the tach must have changed somewhere along the line to match. If you send your tach to NH speedo to be recalibrated they want to know what CDI box you have, so this must affect the input value to the tach.

5. 1978-1983 Tachs. These are driven from the "TD" tachometer drive output from the six-pin CDI box because the points were eliminated in favor of a magnetic reluctor. The SC tach signal is the same as the later Motronic

6. 1984-1989 Tachs. These are driven from the Motronic box.

7. 1990-1998 Tachs. 333.240/006/001. The 964 and 993 tachs are also driven from the Motronic box.

Too much inforamation? Have fun Allan
__________________
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1974 914 2.0 Yellow/Black

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When you think in you're in full control, you're just not driving fast enough