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Selection for the ignition coil: Red or Blue?

Since I bought my “onboro ALFA” in 20 years ago, Bosh “Red” ignition coil had been equipped.


The ignition system was quite normal: Magneti Marelli distributor with the original breaker point.  I had been driving without changing this system, and then my car went into a sleep.

A few years ago I read the article in a historic car magazine that Bosch Red coil is for CDI ignition system and Blue coil is better for normal ignition system with breaker point.  Recently I updated the ignition system to the semi-transistor type.  However, the breaker point system was not changed yet.

Red coil or Blue coil?  That was the question. 

But in last week I found the Blue coil with a good price on the internet auction and I bought it.


I would try the Blue coil.


(My original blog was written on 6th Nov. 2008)
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