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Gtir Motorsport club » General Discusion » Gtir related Discussion »    Ignition Leads Resisance and Ohms

   Ignition Leads Resisance and Ohms

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1 Re:    Ignition Leads Resisance and Ohms on 19th January 2016, 8:07 am

burrows1980

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Handy to know, cheers Mr B

What's your views on BP ignition leads? Think I read somewhere that you wasn't impressed by the quality? Found a French supplier on eBay for £33, where as Nissan wanted £83!

2 Re:    Ignition Leads Resisance and Ohms on 19th January 2016, 9:15 am

Mr B

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gtir technician
gtir technician
Blueprint leads are no where near standard you would hope from other stuff in their range & not worth the price really
I didn't rate Magnacor that highly either considering the cost, originals are damn good & been used in some high hp builds.
Cheaper options with comments/reviews are in link below if don't mind blue or red leads >
http://www.gtir-motorsport-club.com/t3398-ignition-lead-set

3 Re:    Ignition Leads Resisance and Ohms on 19th January 2016, 9:41 am

burrows1980

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Maybe a silly question but how do you know if the leads need replacing? Is the a resistance they need to be etc? I replaced them 11 years ago with genuine Nissan ones, it's only covered 30k since then.

4 Re:    Ignition Leads Resisance and Ohms on 19th January 2016, 10:05 am

Mr B

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gtir technician
gtir technician
Being original & low mileage they probably good, visual inspection & resistance check would be good, may have base values in workshop manual, 5-7-9-11 ohm short to long roughly but sure figures are in manual .
hard beat the oem leads really so not worth binning them if decent/serviceable .

5 Re:    Ignition Leads Resisance and Ohms on 19th January 2016, 10:10 am

burrows1980

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Cool, cheers Mr B

6 Re:    Ignition Leads Resisance and Ohms on 19th January 2016, 10:47 pm

splmum

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This is a general rule of thumb.

Not to exceed 1,000 ohms per inch

I have just gone over my original genuine standard plug set (contact to contact, that is dissy cap end, lead length and plug length) and this is the result

1  16.5"   5.87(k)ohms = 355 ohms/inch
2  21.1"   7.61(k)ohms = 361.3 ohms/inch
3  28.0" 10.67(k)ohms = 381.7 ohms/inch
4  29.9" 11.48(k)ohms = 383.7 ohms/inch

As you can see, they are all well within the rule of thumb.

Use a multimeter over them and you should get around the ohms(k) above.

Edit: Just read Mr B's answer and the 5,7,9,11 factor is pretty close to my readings above. The only one I would question is the 9, it should probably be closer to 10, going on the length of the leads.

7    Ignition Leads Resisance and Ohms on 19th January 2016, 11:07 pm

burrows1980

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Nice one, that's my apprentices job for tomorrow Laughing



burrows1980

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Got round to checking mine today:

1 = 5.55
2 = 7.35
3 = 10.11
4 = 10.94

Again all in spec so saves buying a new set!! got new dizzy, rotor arm and plugs, boom good to go kinda Laughing

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