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914World.com _ 914World Garage _ Ignition options
Posted by: CCE Feb 21 2023, 12:24 AM
I installed a CB Performance ignition kit, on my 74 2.0L, with webers. I Have run it for 1300miles +,- and now am in my third coil… it reduces RPM slightly and then, stops working.
Any ideas why?
Like the idea of not dealing with points and condensers, and when working is very nice, but.
Posted by: Van B Feb 21 2023, 01:01 AM
I put in a pertronix and thought it worked great. I could even see a drift reduction when observing with a timing light.
Posted by: CCE Feb 21 2023, 01:36 AM
I put in a pertronix and thought it worked great. I could even see a drift reduction when observing with a timing light.
Cant figure out why is it blowing the coils, my mechanic say it may be a bad production batch, anyone else using the CV kit?
Thanks
I have. Pertronics distributor here, just need to buy another coil maybe to match. Don’t know wat to do really.
Posted by: Superhawk996 Feb 21 2023, 07:12 AM
Does the coil have an internal ballast resistor? About 4 ohms when you measure the coil primary? No ballast resistor = coil runs too hot and shortens the life.
Posted by: GregAmy Feb 21 2023, 07:17 AM
What is the "CB Performance ignition kit"? Is it a Pertronix and a coil? If so, maybe just try a Bosch blue coil? There's a lot of folks out here doing that.
Posted by: Superhawk996 Feb 21 2023, 08:10 AM
Hmm - I’d talk to CB Performance. Their coil is low resistance and low impedance. It will pull A LOT of current. A lot more than a Bosch Blue coil. If they designed it for 1 ohm it’s up to them to make sure it can withstand the heat that it will generate.
Not liking 1 ohm primary at all for use with an old school distributor that has long dwell time (time the coil is energized). Low ohm coils like this usually serve only one or maybe two cylinders (in wasted spark application) fuel injection applications. In your application, this coil is trying to serve 4 cylinders. That means the coil is powered with a whole lot more “on” time than whatever application they took this coil from. 
Posted by: rfinegan Feb 21 2023, 08:19 AM
Yep, I ATE a LOT of coils on the RX8: lots of sparks 8500-9000 rpm
Hmm - I’d talk to CB Performance. Their coil is low resistance and low impedance. It will pull A LOT of current. A lot more than a Bosch Blue coil. If they designed it for 1 ohm it’s up to them to make sure it can withstand the heat that it will generate.
Not liking 1 ohm primary at all for use with an old school distributor that has long dwell time (time the coil is energized). Low ohm coils like this usually serve only one or maybe two cylinders (in wasted spark application) fuel injection applications. In your application, this coil is trying to serve 4 cylinders. That means the coil is powered with a whole lot more “on” time than whatever application they took this coil from.
Posted by: 76-914 Feb 21 2023, 09:33 AM
Hmm - I’d talk to CB Performance. Their coil is low resistance and low impedance. It will pull A LOT of current. A lot more than a Bosch Blue coil. If they designed it for 1 ohm it’s up to them to make sure it can withstand the heat that it will generate.
Not liking 1 ohm primary at all for use with an old school distributor that has long dwell time (time the coil is energized). Low ohm coils like this usually serve only one or maybe two cylinders (in wasted spark application) fuel injection applications. In your application, this coil is trying to serve 4 cylinders. That means the coil is powered with a whole lot more “on” time than whatever application they took this coil from.
Good call! You're a regular knowledge bank.
Posted by: rhodyguy Feb 21 2023, 12:12 PM
Is that an Autolite distributor?
Posted by: CCE Feb 22 2023, 11:54 PM
Hmm - I’d talk to CB Performance. Their coil is low resistance and low impedance. It will pull A LOT of current. A lot more than a Bosch Blue coil. If they designed it for 1 ohm it’s up to them to make sure it can withstand the heat that it will generate.
Not liking 1 ohm primary at all for use with an old school distributor that has long dwell time (time the coil is energized). Low ohm coils like this usually serve only one or maybe two cylinders (in wasted spark application) fuel injection applications. In your application, this coil is trying to serve 4 cylinders. That means the coil is powered with a whole lot more “on” time than whatever application they took this coil from.
Thank you, thank you, thank you!
It is strange they sell it as a kit.
I will try the pertronix for a while. I have it in hand.
Posted by: CCE Feb 22 2023, 11:57 PM
Is that an Autolite distributor?
It is the CB performance part.
Posted by: CCE Feb 23 2023, 12:00 AM
What is the "CB Performance ignition kit"? Is it a Pertronix and a coil? If so, maybe just try a Bosch blue coil? There's a lot of folks out here doing that.
Here is a picture, the price was comprehensive.
Based on the suggestion I will try the Pertronics distributor and 009 coil I have it on hand (I am running away from points and condensers if possible)
Posted by: Superhawk996 Feb 23 2023, 05:21 AM
My recommendation would be swap the coil only. Why add more uncertainty by swapping multiple components?
Posted by: GregAmy Feb 23 2023, 06:45 AM
My recommendation would be swap the coil only. Why add more uncertainty by swapping multiple components?
Ditto. I'm thinking that disty already has electronic "points". And since your prob is dying coils, I'd suggest just tossing a blue coil on it and see what happens. - GA
Posted by: Superhawk996 Feb 23 2023, 06:48 AM
My recommendation would be swap the coil only. Why add more uncertainty by swapping multiple components?
Ditto. I'm thinking that disty already has electronic "points".
It does from what I saw on CB website when I was looking up the coil specs.
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