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Are these ignition coils any good?

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Hi fellas,

I've tested these coils (see picture) with a multimeter as described in the instruction booklet that came with the meter.

Temperature at the time was 28 Β°C. The resistance in the test leads was 0.2 Ohms.

The coils are as follows:

1. Bosch SU12R - was fitted to a 253 engine.

2. Bosch GT40R - was fitted to a 350 engine.

Both are now shelf items, but being the tight ass that I am, I don't want to discard items that might still be useful one day.

I can't find specific data relating to these coils for Holden use. I can find general data providing generic ranges, which both these coils comply with the specified limitations.

EG Primary resistance - 0.3 to 2.0 Ohms.
EG Secondary resistance - 6K to 30K Ohms.

Both the coils are getting up to 30 years old or more at this time and it's hard to believe they still pass muster.

The simple question is, are these ignition coils good or garbage?

Any feedback is highly appreciated.

Thanks in advance.

Comments

on face value they are both ok and within the values expected...for resistance of pri and sec windings. The true test of course is at working temperature under load...insulation resistance breakdown on secondary for instance may only occur when the coil is hot and with high voltage across the windings...but those readings for a bench test are ok so I would keep them...

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Andrew

Thanks Andrew for the information. It's much appreciated.

I understand your point regarding operations when hot. I'll look at that when and if the time arises. I assume the symptoms of failure under heat/load would be engine misfire in those circumstances. But very happy to not toss these things in the bin (I hope EPA is not reading this).

Anyway thamks for the feedback mate.

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I used the red GT40 coil with a Bosch electronic ignition conversion on my UC 173.

I made a bracket and moved the coil from the engine to chassis rail to try to get it away from the engine heat.

Every thing worked perfectly.

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Disclaimer :- The above is purely speculation and is only posted for entertainment purposes!!!

Car 13, how do you do mate. Thanks for the feedback.

I think you've done a wise thing. Especially if you give the engine a bit of a workout from time to time. Coils don't like heat and that's for sure.

These coils pictured have suffered very hot conditions in the distant past. In fact the 350/GT40R coil got cooked seriously when a thermostat got stuck amd I would not give up driving home that day. To have survived this long, under unsymapthetic handling is a testament to the quality that was built in, in the first place. That GT40R coil has stamped in the top casing the word "Australia".

That was a time long ago when Aussies manufacturd high quality stuff.

Now we make nothing.

Anyway, hang on to your UC, the value can only go up from here.

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The UC is gone now unfortunately.

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Disclaimer :- The above is purely speculation and is only posted for entertainment purposes!!!

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