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Old 14-04-2019   #16
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Re: 0verheating coil

Quote Originally Posted by Vitesse View Post
This thread explains a lot of what youíre looking for. https://www.fiatforum.com/500-classi...0=#post4183980

Both myself and Peter have been running Bosch Blues for a while. Well I donít anymore as I donít have a distributor on my 650 engine and it now has a dry twin coil. But when I had the 500 lump in the car the coil was fine. Itís what 123 recommend to use with their electronic ignition.
I can confirm that after at least 3 years regular usage the Bosch coil is still sparking well. Me and it tend to keep our distance and I suspect that Mr Bosch is not keen on me touching him as I have been given no indication that he has the hots for me.
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Old 16-04-2019   #17
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Re: 0verheating coil

New Bosch coil arrived and reading taken when unit at room temp 20c is . . .

2.8ohm

So, sending that back. Will get on the blower to a supplier and ask them to take a meter reading before sending out to me. Doh !

I have heard that as Bosch coils are made worldwide, mine came from Brazil, the quality is variable.

Oh well, onwards and upwards . .

Rob
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Old 16-04-2019   #18
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Re: 0verheating coil

Like Peter, I have been using a Bosch 'Blue' coil for the last 3 years,along with an 'AccuSpark' ignition---never had a moments trouble with the coil.
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Old 16-04-2019   #19
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Re: 0verheating coil

I recommend this company for the blue coil HT leads, spark-plugs and anything relating the ignition system; they really know their stuff.
https://simonbbc.com/bosch-blue-igni...il-0221119027/
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Old 16-04-2019   #20
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Re: 0verheating coil

Quote Originally Posted by fiat500 View Post
I recommend this company for the blue coil HT leads, spark-plugs and anything relating the ignition system; they really know their stuff.
https://simonbbc.com/bosch-blue-igni...il-0221119027/
I was going to comment that they only appear to sell the dodgy Brazilian ones I decided to look on mine first before I make a fool of myself and it is Brazilian

Just went and got it in from the garage and it measures 2.97Ω when cold, it was a bit chilly in the garage, stuck it on the radiator for 20 minutes to warm it up and it only rose slightly to 3.04Ω. I would imagine that, that figure would rise to somewhere nearer to 3.2Ω in a nice hot engine bay and after producing a few hundred thousand sparks. Thatís measured on a meter that I have recalibrated once a year so itís really accurate.
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Old 16-04-2019   #21
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Re: 0verheating coil

Quote Originally Posted by Vitesse View Post
I was going to comment that they only appear to sell the dodgy Brazilian ones I decided to look on mine first before I make a fool of myself and it is Brazilian

Just went and got it in from the garage and it measures 2.97Ω when cold, it was a bit chilly in the garage, stuck it on the radiator for 20 minutes to warm it up and it only rose slightly to 3.04Ω. I would imagine that, that figure would rise to somewhere nearer to 3.2Ω in a nice hot engine bay and after producing a few hundred thousand sparks. Thatís measured on a meter that I have recalibrated once a year so itís really accurate.
Very wise to check your facts first... not something I usually do. This is where my original decision was made ..

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

It's quite informative. The proof of the pudding etc. Mine is no longer blue as the label came off and it got some black overspray but that doesn't affect its performance.But my ultimate customer review of the company I bought it from and the coil itself is that despite a short period of overheating when my voltage-control went faulty and doing me proud for, I guess, at least 20,000 miles, I haven't got the slightest misgivings that it it won't go on forever. PS. I've never checked the internal resistance or measured it's temperature.
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Last edited by fiat500; 16-04-2019 at 18:27.
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Old 16-04-2019   #22
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Re: 0verheating coil

Did it have “Prince of Darkness” under the label?

I think I have seen that page before, no doubt spoken about it before in the dim and distant past? ��

I was confused, it looks like those dodgy Mexican’s you need to be wary of , not the poor Brazilian’s. Which I suppose makes sense as they continued to make the Beetle for years and it uses the same coil, so there was probably not a shortage of demand.
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Old 17-04-2019   #23
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Re: 0verheating coil

Quote Originally Posted by fiat500 View Post
I recommend this company for the blue coil HT leads, spark-plugs and anything relating the ignition system; they really know their stuff.
https://simonbbc.com/bosch-blue-igni...il-0221119027/
I spoke with these guys yesterday. It's where I got the Viper coil from. Their website states the blue coil as 3.4ohm. However when I spoke to the chap, he said no, they are 3ohm. He went and measured some and confirmed all showing as 3ohm.

So I've ordered a Beru 172 which a lot of the VW classic guys use. Rated at 3.3 on the primary. Due tomorrow. Shall see what the meter shows.

If not, I'll get another Bosch blue and irrespective of the reading, will plumb it in and see how it performs.

What a faff I'm having. But will get it sorted
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Old 06-05-2019   #24
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Re: 0verheating coil

Right for me at least, problem solved. Iíve fitted a Beru Blue 172 coil and it does still get hot but not as burning hot as other coils Iíve fitted.

It seems that the higher resistance of the primary has done the trick (3.3 ohm). This coil used by a lot of the VW air cooled bunch has lower amp to the points so they donít burn out. According to their adverts. Early days, but post long drives and touch test, all is where Iím want it to be.

Got mine of the bay of e by company called machine7. 2 day delivery. No affiliation etc.

Cheers
Rob
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Old 20-05-2019   #25
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Re: 0verheating coil

Any chance of an update Rob?

i fitted (sequentially) several dry Viper 2.7Ohm (primary) coils with and without an "auxiliary" resistor to bring up to 3Ohm and still had the engine cut out after 20 mins with each.

i am still not decided between ignition problem or fuel vaporisation on my car.

cheers
RDS
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Old 4 Weeks Ago   #26
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Re: 0verheating coil

As in another post I put on here check all ignition parts from dizzy to plugs I found it was one of my plug extensions that had a much higher reading than the other. I thought they were solid but on cutting one open it has a sort of spring inside , so check yours.
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Old 4 Weeks Ago   #27
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Re: 0verheating coil

I did see that post but didn't realise it was the cure!!

I already checked lead resistance and all were within a tolerance so no cure for me yet....


cheers

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Old 4 Weeks Ago   #28
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Re: 0verheating coil

Hi RDS, so as per my post above. I've fitted a Beru Blue 172 coil and so far, post drive, its not hotter than the surface of the sun. It's hot, but not as bad as the other coils. It has a primary resistance of 3.3 ohm.


But to be honest, even with my Viper coil at 2.7ohm, I never had an issue with regards to the ignition. Just that I was not happy at the high heat the unit contained.

Cheers
Rob
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Old 4 Weeks Ago   #29
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Re: 0verheating coil

Cheers Rob
I hope to get to a show at the weekend in a different car and plan to feel as many other coils that I can for comparison purposes!
I get a slight warning of impending cut out when the rad fan starts but it is immediate really hence the thought that it's ignition.

Further thought and testing required....

Ttfn
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Old 3 Weeks Ago   #30
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Re: 0verheating coil

Hi guys, I'm having a similar issue and just got done having a friendly disagreement with the mechanic about the problem being with the coil, the starter, or both. Like the original post the car stutters and stalls after running for about 20 minutes. At this point, when trying to restart, the starter grinds slowly, if at all, as if the battery is dead. After cooling off (for a while) it will start again like normal.

Car has new battery, distributor, plugs, leads.

The mechanic measured the resistance at the coil and got something like 1ohm (well below the 3.4ohm min as I told him). I reckon that we need to check the resistance in the leads next but he seems to think the starter is bad.

So the question to you all: does this overheating coil problem cause the car to slow crank/no-crank? Or do I need to investigate the starter?
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