Vintage Bosch Blue Coils

[Brad Davis]

I have been picking up the older Bosch blue coils when I run across them at swap meets and my usual junkyard hangouts. These older blue coils from the late 60's and early 70's have a different look - larger diameter can, screw terminals, and a domed ceramic top. I think the main draw is these coils look like the blue coils originally used on the 911R. Does anyone know if these older blue coils apply to any of the early 911 cars. It is my understanding the the blue coil was sort of a universal coil to be used on multiple cars. Any info or thoughts?

0 221 118 005 Primary Resistance 0.4 Ohms
May 1971

0 221 102 074 Primary Resistance 3.1 Ohms
Dec 1970

0 221 102 003 Primary Resistance 3.1 Ohms
May 1973
June 1974
Nov 1971

0 221 102 012 Primary Resistance 3.0 Ohms
Sept 1971
Nov 1968

Thanks,

Brad

[304065]

Brad, cool coils! (Super-secret coil police here!) Those look to be 60mm diameter, different than the later ones. A photo to illustrate the size difference attached.

Here is a survey of the early coils. The order goes, 006 026, then the CDI coil, then the 924/928 coil, then the dual e-cores of the 993. That is about it for coils for stock 911s over the years.

http://www.early911sregistry.org/for...ght=inductance

The blue coil was always an aftermarket performance coil- you can see from the resistance values that it has internal resistance at about 3 ohms. In the "universal" context it could be used without a ballast resistor and not fry the points.

The first coil you list, with the 0.4 resistance, must have an internal short from overheating. That would pretty quickly cook a stock early ignition system. Are you sure it's 12V? There are early fat 6V coils floating around out there from BMW bikes that look very similar.

[304065]

The first number is an 00027 code, not necessarily a blue coil

the next two look like aftermarket, particularly the 003 which supercedes to an 0 221 119 027-- that is the classic later blue coil part number. The little blue one I posted is an 027.

the final one does not come up is that a good number?

Can you post some photos of the flat end? That helps to figure it out from the type number.

[Brad Davis]

Hey John,

I was hoping you would jump in

Tonight I will get a few pictures of the coil bottoms. The 00027 is suspicious, the blue paint looks to be a different shade, probably a rattle can job.

The first coil I listed, 0 221 118 005, is a bit of a mystery. It is indeed a 12v unit. I wonder/hope that it may be for a Transistor Ignition as used in the early Porsche race cars. I read about another coil used with the early Bosch transistor ignition which used coil 0 221 118 003. This coil measured 0.8 Ohms versus the 0 221 118 005 at 0.4 Ohms. Also the part number is awfully close to the 0 221 118 005. Wishful thinking?

I will double check the number on the two coils with 0 221 102 012. That should be accurate, but cannot hurt to double check.

Thanks,

Brad

[Brad Davis]

Here are the bottom shots. Bottom of the coils

[Brad Davis]

few more of the blue coils

[mike curnow]

Brad

I have a 12V Blue 0 221 119 027, and a 6V blue 0 221 101 005

Mike Curnow

[Brad Davis]

Hey Mike,

I have one 6V vintage blue coil. I will check to see if it is an 005 also. I wonder if the any of the 4 cam cars came with blue coils from the factory?

Thanks,

Brad

[gled49]

Here is a transistor coil. .7 ohm. #'s are 703 ZS8/1K6 KW6/12V R2466

[Steve@Rennsport]

That looks familiar,...