Board logo

Switch from Coil to Coil Pack - Spark Plug changes?
supercat - 4/6/07 at 10:24 AM

Hello,

Switching from dizzy/coil to crank trigger/coil pack on my Pinto - should I be changing the spark plug gap or even the plugs now? I think I saw it mentioned somewhere because the spark is more powerful?

Cheer, James

NS Dev - 4/6/07 at 12:05 PM

not really necessary.

Just bear in mind that the plugs wont last as long with wasted spark coil pack as they spark twice as often.

I run standard gaps on my vauxhall xe engine as per haynes manual for normal ignition system, and it made excellent power on "normal" ngk plugs and gaps etc, when using the coil pack dizzyless system that I use.

martyn_16v - 4/6/07 at 06:46 PM

quote:
Originally posted by NS Dev
Just bear in mind that the plugs wont last as long with wasted spark coil pack as they spark twice as often.


Is that really an issue bearing in mind how little energy goes through the 'wasted' spark? I can't say i've ever paid much attention to how long spark plugs last in different setups (TBH I can't remember the last car I had that actually lasted long enough for them to need changing )

supercat - 4/6/07 at 06:57 PM

quote:
Originally posted by robocog

Just stand waaaay back when testing for sparks !!!
Coilpacks deffo put out a fair old crack of lightning compared to stock single coil /points systems


I've got that t-shirt!

Micael - 5/6/07 at 07:32 AM

quote:
Originally posted by robocog
Make sure they are resistor type
(eg apR6fs)
The R is for resistor and the leads are good quality
Otherwise you could induce interference (electrical noise) under the bonnet that will confuse the ecu (been there got the T-shirt)


I've got that t-shirt aswell (but with faulty resistor plugs)

DarrenW - 7/6/07 at 11:27 AM

NGK apr6fs is std pinto spec afaik. std NGK gap is 0.8mm. Ive regapped mine to 24thou (0.6mm). Only just fitted so dont know about life with MJLJ fitted. Cant imagine life will be an issue though as for the cost ill probs change at every service or maybe stretch to every other one.

Just a word of warning if you decide to go for harder plugs. NGK would be a 7 but Champion use a different numbering system. I went for Champion 7is thinking they would be hotter plugs but alas no. There is also a thought that if car is predominantly fast road with occasional track the std NGK plugs are fine. NGK seem to have a wider heat range.