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JOHN BOY

Distributors

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My Question is, was there a difference in the Distributors used in 1975 between Standard trans and Automatic transmissions?. I'm looking for a rebuilt and all the major auto parts Distributors advertise I can not use the one listed for a standard transmission on my 75 with an Automatic transmission? The p/n on the one I have removed lists to A 71 2002 tii? I'm so confused. Any info would be greatly appreciated.

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It sounds like someone before you changed the distributor. The Tii distributor should not have a vacuum advance can on the side.  I can't see how a difference between a standard and automatic transmission distributor would be significant without looking at the advance curve on each one and comparing them. 

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(edited)

If you can give me the model year and VIN of your car as well as the 10 digit Bosch number stamped on the side of your existing distributor (should start with "0 231 xxx xxx"), I may be able to figure out what you have and perhaps what you need. There were several different units used over the span of 18 years, and BMW / Bosch often superseded the part numbers to newer ones (sometimes more than once!)

 

I'll see what I can find out for you, if I can!

 

 

Edited by wegweiser

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I have a 1970 automatic and the distributor I have has a mechanical vacuum advance which connects to the carburetor through a3.8: rubber tube. I don't see any difference between the one I have and the ones that I have salvaged from standard transmission models.  

From the Haynes Manual, all models except 1502, 2002TI, and 2002 TII use a Bosch IFUR4.

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The 1975 Automatic had a distributor with a single vacuum advance port, the 1975 manual's distributor had a vacuum and retard port.  You should be able to find a distributor with the vacuum advance port you require, including the popular 123 Ignition distributor which can be setup to match any advance curve you desire.

 

Post a picture of what you have., the Tii distributors don't have vacuum advance pods on them.

 

Mark92131

75 US Emission.png

75-Auto-Emissions-Sticker.jpg

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Hi guys,

  remember, the 1974 US tii models came standard with a distributor that has a single port vacuum retard on it.  Thanks,

John

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The original post said the distributor he has is from a '71 Tii.  This would NOT have a vacuum advance on it. 

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6 hours ago, wegweiser said:

There were seventeen different units used over the span of 18 years, and BMW / Bosch often superseded the part numbers to newer ones (sometimes more than once!)

 

Fixed that for you, Paul!

 

I have found at least 3 different vacuum advances, numerous spring differences, different weights,

3 different generations of geometry.... blah de blah.

 

Short version?  A distributor in good shape with a healthy mechanical advance AND a working 

vacuum pod is going to work pretty well.  If you get more involved in it than that, either talk with Tom

(76Mintgrun) or start looking at the 123 programmable dizzy threads...

 

And a JFUR4 could have quite a few different curves in it...

 

one opinion,

t

 

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+1 on the TobyB comments. I don't think I have EVER disagreed with that fella. 

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Dude unless you are restoring it to factory, using all oem parts, get a 123. Bulletproof, programmable and looks factory enough. Each car is going to respond to timing differently and the m10 is very sensitive to timing (ask anyone).




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On 1/10/2019 at 3:59 PM, Preyupy said:

The original post said the distributor he has is from a '71 Tii.  This would NOT have a vacuum advance on it. 

Doh.  I need to read the entire post before putting my foot in my mouth ?

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