Simple & concise tutorial. Thanks heaps.

Excellent please share!

No problem I try to aim them at problems I see. Please share!

Thankyou

Share it Steve!

Please share!

Contact minispares for this info.

Maybe you should check out other videos of mine, for just that; kzfaq.info/get/bejne/gLGDrKWo17ytoqc.htmlsi=_msKx3Au46oJyPB9

Stick with the same setup. However if you were using a 3 ohm coil you would be better off converting to a 1.5 ohm at the same time and including a ballast resistor. Better still fit a kit that can use a 0.8ohm coil and the you can fire 0.035” plug gaps

Coil type determines plug gap. Aftermarket electronic ignitions have different requirement depending the age and who makes them.

I used a 4 gas for years, to slow to respond and I can sense when the engine is not running correctly. I have also used scopes but after tuning a few thousand engines I can tell a bent dizzy shaft or a poor coil and have ground scopes to be of little use now.

Too smaller gap does not do any damage as far as I have experienced however you can light off leaner fuel mix using the larger gap

Race engines need to be dialled in under load, Anything else is guesswork.The maximum advance is determined by using a rolling road. I can’t answer that without measuring it!

My £450 bluepoint meter is no different

Check the primary resistance

Check to see if it has a ballast resistor still fitted, it might be that the connection to short this out during cranking is not working this reducing the ignition power while cranking.

@@ACDodd thanks for the tip, I will check that.

You can use a 1.5 ohm coil, but you need to reduce the spark plug gaps to 0.025”. The point of the 0.8ohm is more spark energy, that means you can run 0.035” plug gaps.

You have it correct. 3 ohm and 1.5ohm ballasted types 0.025”. 0.8 is ohm with the 65d 0.035”

3 and 1.5 ohm coils 0.025”, 0.8ohm 0.035”. Standard new plugs come at 0.032” so the gap is too wide for engines that are not using the 0.8ohm coil and needs to be reset at 0.025”. All new plugs need to be correctly gapped before fitting.

So for my electronic ignition I should have a 0.8 ohm coil ?

@@ianroberts8692 what electronic ignition have you got?

@@ACDodd replaces the points in the dizzy

For a willys engine a stock 3 ohm 12 volt coil is fine it’s does not rev hard enough to warrant a high power coil, I also doubt you could calibrate the carburettor suitably to take advantage of a high power coil setup.

@@ACDodd thanks nice to know that there are still some Good old school gents around.

Why more than 3.5ohms?

What electronic ignition type?

No I think the ones I use are much higher than that.

Yes and yes.

@@ACDodd thank you.

Some coils will run fine with the larger gap, try both and see what runs best. However I have noticed that some coils breakdown when firing wider plug gaps, and hence using the correct rated coil for the job

@@ACDodd Ok thanks for the advice,I will reduce gap at 25 just to be on the safe side .

It’s lacking energy at higher rpms

​@@ACDoddlate answer from me. I see you use the 1.5 ohm balasted Viper coils at the 65D electronic ignitions. Will this be the one that I need for my 123 ignition and will be there a improvement? Thnx

@@StefanMiniCooper no I have now reverted to the 0.8ohm viper I had a couple of coil failures with the 1.5ohm units running the bigger plug gaps.

@@StefanMiniCooper whichever dizzy you fit you want to be using the highest coil power you can.

@@ACDodd ok, thanks for your reply! 123 says that I need a coil with a minimum from 1.0 ohm, so 0.8 ohm can damage it I'm afraid. So maybe better to look for another 1.5 ohm coil?

Contact accuspark direct.

Mine is autoranging

Just look in my list of videos; kzfaq.info/get/bejne/pK5_hN2akrDJYX0.htmlsi=_oPGwsb66HlmsBeG kzfaq.info/get/bejne/ab16qKpoy9jemJ8.htmlsi=TWvv0im33xcHzkDM

1:1000

@@ACDodd Sorry, wrong. 90:1 in the ones I have checked. A ignition coil does not work like a regular transformer. It charges the primary winding, then opens the circuit and this happens. 1. The secondary is open circuit (10's of megaohms) as the spark plug has a air gap (and in the cylinder the air is compressed, making it more resistance than atmospheric pressure). 2. with a very high impedance load on the secondary, the voltage sky rockets upwards (its called CEMF or BEMF). high enough to jump the air gap of the plug. If you run the primary with say 1Vac sine wave and look at the secondary you will see ~90Vac for a 90:1 ratio. I am sure they are not ALL 90:1, but somewhere around there.

@@Ozzy3333333everyday is a school day!

What’s your coil resistance?

​@@ACDoddmany thanks for your help, it's a fairly new coil bought from Bull motif, primary 2.8 ohms, secondary 8.39. I also have the old coil which I took off, it's readings are, primary 3.3,secondary 4.31. Thank you again. G.

@@gerardlacey9384 what is the dwell angle reading with the engine running at idle and at 4000rpm?

​@@ACDoddthe dwell is 62 degrees at both idle and 4000 rpm.

@@gerardlacey9384 reduc the dwell to 56, this will take the edge off the running temp of the coil.

Simply disconnect one side of the coil To make the measurment.

Why would you not know when it is in your workshop manual. As someone who tunes these cars it is not futile, in my experience.

What does the manual say should be used with it?

No, that’s not possible in a lot of cases, the insulation on a 6 volt coil will inhibit its use in 12 volt applications. Most coils in the uk are not voltage marked

How many cylinders?

@@ACDodd Single cylinder 4 stroke points ignition no ballast as far as I can tell! Cheers

@@notwocdivad single cylinder that should be fine. However if you want to increase the plug gap, then fitting the appropriate lower resistance coil is the way forward. The lower the coil resistance the more current the points will have to contend with and the shorter the life of the contacts. You will also need to adjust them more often.

@@ACDodd Thank's AC, You have been a great help. The Standard plug gap is .70mm which will do me on a low power engine like the Bullet! I'll replace the HT lead and see if that gets it sparking. Thanks again.

It needs to be disconnected from the electrical circuit to be able to check it. Only one side of the coil needs to be disconnected to make the measurement.

You need to see if the dizzy is a variable dwell unit, by measuring with a dwell meter. You also have a ballast feed to the coil which is not needed with a variable dwell dizzy

@@ACDodd I'll see if I can find a dwell meter. And let you know

@@ACDodd yes it vas the pertronix ignitor II with variable dwell

@@troypowell1671 ok next contact Petronix and see if the module is rated to run with a 0.8 ohm coil with no ballast resistor.

@@ACDodd yes he said i can get rid of the resistor wire he said the modules are rated at a certain volts and no matter how many you try to put through it it will only put out what it is rated at but you restrict it and you end up with weak spark

It will overheat the points if you run a 1.5ohm coil with no ballast.

No

Something that can catch folks. If you look around under the hood of some cars, you won't see the usual resistance block. It's built into the harness as a wire.

What type of electronic ignition is fitted?

Accuspark I believe

@@tonywood6332 part number?

45D

@@tonywood6332 no the accuspark part number

You are correct, that is the benefit of a ballast system. However in a high power 0.8ohm system, you get the same effect. But better still you have twice the energy at higher rpm.

No, that’s asking for trouble.

@@ACDodd Thank you, Your help deserves my sub

In what respect? There are 3 applications, 3 types are needed for these applications. If you want to know what’s best, then that’s easy, the 0.8 ohm coil wins evertime. However if you have an original 1960’s vehicle this may it be the right one for you.

I don’t work for Viper or Powerspark, I just use there components.

Thanks for the feedback, being dyslexic and short in time means that that’s just about the best I can do.

I have know idea what he is talking about, it’s a great video, presentation and content!

Yes that’s ideal for engines with more cylinders.