Bosch Blue Coil

[DesertGuy]

I recently came across this and found it an interesting read, it even references this site:

http://www.ratwell.com/technical/BlueCoil.html

In regards to the Bosch Blue Coil, is there a "wrong way" to mount them concerning their orientation? I have read that they should be mounted with the terminals facing down, and also, have read that it doesn't really matter... terminals can face up, down and sideways. I imagine this is having to do with keeping the ballast resistor or coils bathed internally, but was curious nonetheless.

Steve

[Ol'fogasaurus]

I mount mine facing down so moisture has less of a chance to wick in the high tension lead hole. Also, the wires if they come off may not make accidental reconnections on the way to stopping. Funny story about that .....

[MNAirHead]

I just had a 6v leak the oil out and fail in one of our verts.. don't know if it would have failed if upward

[david58]

I just had a 6v leak the oil out and fail in one of our verts.. don't know if it would have failed if upward

I do believe that it only slows the problem down heat would eventually cause the coil to boil the oil out and end in failure because of the leakage.

[fortyeye]

One really important point of Richard's article is the primary resistance. If you plan on using a electronic module in your dizzy (in place of points and condensor) check your primary resistance with an ohm meter. Measure between the two spade connections (with no wires attached)(+ and - primary) ... a reading of 3(+) ohms is good for the electronic module setup. If you have a coil without the ballast resistor (internally) you need to change the coil. It will read less than 3 ohms primary resistance and will fry the module.

[sagaboy]

One really important point of Richard's article is the primary resistance. If you plan on using a electronic module in your dizzy (in place of points and condensor) check your primary resistance with an ohm meter. Measure between the two spade connections (with no wires attached)(+ and - primary) ... a reading of 3(+) ohms is good for the electronic module setup. If you have a coil without the ballast resistor (internally) you need to change the coil. It will read less than 3 ohms primary resistance and will fry the module.

Not quite true. I have been using an add on cheap $20 electronic point replacement I got from ebay and using a non-resistance coil for 9 years/daily drive and no problem (nine years ago the add on electronic point cost only $20 that they sell for $75 today).

[sagaboy]

Bosch blue coil is suppose to produce a higher spark voltage of 18,000 volts and the original vw coil produces 12/14,000 volts and Bosch red coil produces 25,000 volts and some high performance coil like flame-thrower produces 40/50,000 volts.

Basically,
it all boils down to your spark plug gap setting, if your plug gap are set at 0.024 (for winter) or 0.028 (for summer) then it don't matter what coil you are using as the the spark plug gap will determine the sparking voltage that fires the plug as it only requires 10/11KV for a 0.024 gap or 12KV for a 0.028 plug gap. Therefore, even using a 50KV coil will not affect the "switching" contact point or an electronic module because as due to the plug gap setting the "switching" point will only handle 10/12KV