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spark plugs 

 

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 Post subject: spark plugs
Posted: Tue Apr 12, 2011 10:50 pm 
Parts Gopher
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Age: 37

Posts: 55

Joined: 4th Sep 2010

Ride: ba xr8 supercharged

Location: perth
WA, Australia

ok this sounds like a dumb question but running iridium plugs is better than standard plug.i only ask this coz i,ve been told by capa to run a standard plug but i bought the car with the blower and it had iridiums in it
also got told to gap the standard plug to 1.0mm where as the iridium is 0.8mm i,m wondering if this could be the cause of some very minor probs i,m having....i.e pinging at wot, and a delay of acceleration from rolling at say 60kmh followed by a large puff of black smoke then swinging up the street :twisted:

if anyone has ideas or similar experience with a charger i,m all ears :D
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 Post subject: Re: spark plugs
Posted: Tue Apr 12, 2011 11:04 pm 
Moderator
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Posts: 14513

Joined: 7th Nov 2004

Ride: ford falcon au3 xr8

Location: a shit suburb in sydney
NSW, Australia

i had iridiums with a supercharger, iridiums are better in the sense that the can last up to 80'000-100'000kms..
with boost its better to have a slightly smaller gap so .8mm is about right for boost..

heat range could cause pinging, so can a poor tune...
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 Post subject: Re: spark plugs
Posted: Tue Apr 12, 2011 11:10 pm 
EFI Guru
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Age: 52

Posts: 4289

Joined: 5th Nov 2004

Gallery: 28 images

Ride: 351 Vogue,XH 5.0,'17 5.0 Stang

Location: Perth
WA, Australia

If you run a larger plug gap without an improvement in your ignition system and run a blower you will most likely blow the spark out. Usually you would close the gap up from std with a stock ignition system. BPT used to sell a device called Plasma Booster which will multispark your stock coils and increase spark energy at higher load/rpm and allow you to run a larger gap.
The black smoke is unburnt fuel which will of course happen when the spark is blown out. It stands to reason it's happening when you're already moving because a centrifugal won't have much boost off idle.
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 Post subject: Re: spark plugs
Posted: Wed Apr 13, 2011 8:34 am 
Parts Gopher
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Age: 37

Posts: 55

Joined: 4th Sep 2010

Ride: ba xr8 supercharged

Location: perth
WA, Australia

i thought it might be blowing out the spark.....wont listen to capa anymore
i'll get a new set of iridiums for the weekend and hopefully that will fix her up :D
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