spark plugs

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27-03-2008, 05:31 PM
Shimian

damn, look at what ive started :p
I only want to know if the Iridiums IK20L would fit my FD2 :zip:
27-03-2008, 05:54 PM
dsp26

Quote:

Originally Posted by claymore

"However one thing it didn't cover which is what i'm curious on... thermal conductivity is mentioned, but what about electrical conductivity of the electrode depending on the temp of the ceramic insulator?"

Insulators have NO ELECTRICAL CONDUCTIVITY that's why they are called insulators. And insulator temperature has no effect on electrical conductivity of the electrode they are insulating ... unless you cool them down to close to absolute zero ... and that's very hard to do inside the combustion chamber.

yeah i know.. but what i'm getting at is that the ceramic is what retains any heat that is created by the combustion process.. it would transfer heat to the electrode that sits inside it... surely it also affects the conductivity of the electrode even by a poofteenth of a difference...

small issue.. like i said, curiousity...
28-03-2008, 01:03 AM
gReY-oNe

Quote:

Originally Posted by Limbo

If you use the wrong plugs you usually have;
- startup problems
- may get premature ignition/detonation
- car may not start
- fuel economy goes crazy
- car drives/ idles funny

Effects? can case engine damage or just be a pain in the A$$

just wondering if another effect of wrong plugs could be no fuel delivery?

seems my plugs fail every 3000kms
or goes shanky cos the fuel seems to be "choking"
28-03-2008, 08:20 AM
aaronng

Quote:

Originally Posted by gReY-oNe

just wondering if another effect of wrong plugs could be no fuel delivery?

seems my plugs fail every 3000kms
or goes shanky cos the fuel seems to be "choking"

Shouldn't be.... the fuel pump runs off a separate circuit, and the injectors are located in the intake manifold anyway, not in the cylinder head.
28-03-2008, 08:21 AM
aaronng

Quote:

Originally Posted by claymore

Then think again which part of the plug is closest to the heat generated by the combustion process and therefore gets the hottest... the ground electrode and the center electrode not the insulator. If anything the center electrode would be trying to dissipate it's excess heat into the insulator not the other way around.

:thumbsup::thumbsup::thumbsup: Without work done, heat travels from a zone of high temperature to a zone of lower temperature, not the other way around.
28-03-2008, 08:56 AM
Limbo

Quote:

Originally Posted by gReY-oNe

just wondering if another effect of wrong plugs could be no fuel delivery?

seems my plugs fail every 3000kms
or goes shanky cos the fuel seems to be "choking"

Effects of boost, running too rich, fouls the plugs real quick.
That's why most boosted car run copper plugs and change them very often.
I rem my old car killed the platinum ones in under 2,000km.
If you get the car tuned for the plugs you shouldn't have as much issue though.

Yeah as arrong said, fuel is different, but your prob not sparkign the fuel due to your plugs fouling and its flooding the engine
28-03-2008, 09:00 AM
aaronng

^^ Yeah, I misunderstood her post too. But I agree, run too rich and the plugs foul up. The reason for running rich is to protect the engine from preignition, but that means that you need colder plugs, which end up fouling quicker. What boost pressure are you running? Reduce it slightly, which means you shouldn't need to run as rich and you can also go to a slightly cooler plug.
28-03-2008, 09:30 AM
FastFwd

Quote:

Originally Posted by dsp26

Eurodude.. part you highlighted in bold makes sense.

FastFwd: in your case it seems more like a tuning issue as from your description there was no proof or proven discovery that the plugs were fouled.. it seems to me that your car was tuned maybe specifically on 98oct hence it not running correctly on the 95 with oct booster?

Nah thats not the case, i have run 95 before without octane and it worked fine. It was specifically the plugs. they wernt fouled the tips almost looked white. The oct booster apparently leaves a residue in the tip of the irridium metal or something i dunno. But it deff was the plugs. not the fuel
28-03-2008, 10:17 AM
gReY-oNe

Quote:

Originally Posted by Limbo

Effects of boost, running too rich, fouls the plugs real quick.
That's why most boosted car run copper plugs and change them very often.
I rem my old car killed the platinum ones in under 2,000km.
If you get the car tuned for the plugs you shouldn't have as much issue though.

Yeah as arrong said, fuel is different, but your prob not sparkign the fuel due to your plugs fouling and its flooding the engine

i dont really understand wats goin on all i noe is i have to change them alot
:thumbdwn::thumbdwn:
oil change every 5000 and looked like sprak change every 2500
the car got retuned on wednesday with the plugs so im hopin this is better
my first tune was with platinum plugs which failed fast

Quote:

Originally Posted by aaronng

^^ Yeah, I misunderstood her post too. But I agree, run too rich and the plugs foul up. The reason for running rich is to protect the engine from preignition, but that means that you need colder plugs, which end up fouling quicker. What boost pressure are you running? Reduce it slightly, which means you shouldn't need to run as rich and you can also go to a slightly cooler plug.

im only runnin about 8psi reduce it anymore and i wont be about to go up a slight up hill LMAO

umm would u guys happen to have any advice on wat brand or type of colder plugs i can get ?
my next service is this weekend so i can pick up one today

Thanks heaps
28-03-2008, 12:16 PM
Limbo

i'm running NGK platinium 7 range & i'm running 10PSI.
Mine was tuned with platinum plugs also.

I think you should see a change from the retune. If they tune it to 14.7 A/F it should be fine. I had a look at my plugs after about 1,000km and they looked fine.

All comes down to the tuner
28-03-2008, 12:16 PM
aaronng

Quote:

Originally Posted by gReY-oNe

i dont really understand wats goin on all i noe is i have to change them alot
:thumbdwn::thumbdwn:
oil change every 5000 and looked like sprak change every 2500
the car got retuned on wednesday with the plugs so im hopin this is better
my first tune was with platinum plugs which failed fast

im only runnin about 8psi reduce it anymore and i wont be about to go up a slight up hill LMAO

umm would u guys happen to have any advice on wat brand or type of colder plugs i can get ?
my next service is this weekend so i can pick up one today

Thanks heaps

What spark plugs are running now? The exact part number if possible. Also, what are your AF ratios?
28-03-2008, 04:32 PM
dsp26

I reckon get NGK IRIWAYS/IRITOPS

Quote:

Originally Posted by NGK

NGK Iritop 7 Iridium Spark Plug

Gap - 0.8mm
Heat range - 7

The NGK Iritops are performance plugs suited specifically for engines requiring colder rated spark plugs and smaller gaps not catered for in the Iridium range.

An ideal replacement for cars using the BCPR6EIX-11/BCPR7EIX-11 that require a smaller 0.8mm gap at higher boost levels

NGK Iriway 7 Iridium Spark Plug

Gap - 0.8mm
Heat range - 7

The NGK Iriways are performance plugs suited specifically for engines requiring colder rated spark plugs and smaller gaps not catered for in the Iridium range.

An ideal replacement for cars using the BKR7EIX-11 that require a smaller 0.8mm gap at higher boost levels.

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