Spark Plug Info............

[COOPER S KID]

just thought that you guys might like this info i just recieved right now !

my good mate is the manager of the EFI division in spare parts for city ford and today i told what plugs i wanted and he just rang me back saying " are you sure it was denso IK22 plugs " i said yes why?? " because they come up on our computer with a cross reference to APEXI,TRUST,GREDDY-WRX STI-SKYLINE GTR-LANCER EVO AND OTHER HKS PLUGS - he then crossed referenced the denso ik22 plug with ngk and then was told that those plugs are used sometimes in alcohol fueled drag cars............. how good is that ! alcohol drag cars and my mini can swap plugs and drive away !!!!

[St00ge]

the ngk equivalent are just as good. They are iridiums with a heat range of 22, like the IK22s. Some ppl use the ngk's some use the densos. Same thing.

I told you they were good.

[Tit]

A colder spark plug is often reccomended on cars with smaller sc pulleys - protection against detonation / pinging. Don't forget, the mcs is a forced induction car, like all the ones you mentioned...an mcs with a 15% pulley has the potential to push 15-16psi, which is a fair amount of pressure..

Hey CSK...can you put a few pics of your car in your gallery (and activate it )? I'm sorta intrigued...

[St00ge]

josh's car's induction is going to be very forced, with a 19% pulley and intake.

Anyways, josh, the stuff i told you in the PM about the plugs, some people have a different school of thought in america, where they have crappy fuel. It their case, they want their plugs to fry before the knock sensor has to but in. Cos if they detonate or pre-ignite, and for some reason the knock sensor fails to work, serious damage can result. But we have good fuel here, and no doubt you fill up with it if ur running MTH.

Quote: Originally Posted by Tit

can you put a few pics of your car in your gallery (and activate it )? I'm sorta intrigued...

i second that motion

[dsakko]

Ok, so does the Cooper use the same plugs? And do the same rules apply when running a more aggressive mapping? Like say the Superchips ECU upgrade?

Let's not forget about our naturally aspirated brothers here!

[COOPER S KID]

Quote: Originally Posted by Tit

A colder spark plug is often reccomended on cars with smaller sc pulleys - protection against detonation / pinging. Don't forget, the mcs is a forced induction car, like all the ones you mentioned...an mcs with a 15% pulley has the potential to push 15-16psi, which is a fair amount of pressure..

Hey CSK...can you put a few pics of your car in your gallery (and activate it )? I'm sorta intrigued...

would be glad to im gonna get doona to help me cos i have photos of the car in pieces and getting put together and apart ! so yeah in about a week they should all be in there !!!!

[COOPER S KID]

Quote: Originally Posted by dsakko

Let's not forget about our naturally aspirated brothers here!

i like that ....!

[COOPER S KID]

just found this its pretty cool !

[Tit]

Quote: Originally Posted by dsakko

Ok, so does the Cooper use the same plugs? And do the same rules apply when running a more aggressive mapping? Like say the Superchips ECU upgrade?

Let's not forget about our naturally aspirated brothers here!

From what I understand, the problem is more related to forced induction cars.

Someone please correct me if I'm wrong, but if a plug is too hot, it can cause detonation too early in the combustion cycle and therefore, endangering things like pistons etc...

I assume that in forced induction cars, the air/fuel mix is more volitile due to the increased pressure (or increased O2 density?), therefore they are more prone this this potential problem than N/A cars....

...for more experienced punters - would running a plug that is too cold cause the car to run richer than desired?

[St00ge]

Quote: Originally Posted by Tit

From what I understand, the problem is more related to forced induction cars.

Someone please correct me if I'm wrong, but if a plug is too hot, it can cause detonation too early in the combustion cycle and therefore, endangering things like pistons etc...

I assume that in forced induction cars, the air/fuel mix is more volitile due to the increased pressure (or increased O2 density?), therefore they are more prone this this potential problem than N/A cars....

...for more experienced punters - would running a plug that is too cold cause the car to run richer than desired?

you're right on the money Tit, all the way through

If a plug is too hot (it can't get rid of the heat quickly enough), it has the same effect of a spark, as it can ignite the mixture. This usually happens in Forced Induction cars cause of the much lower activation energy required to combust the mixture. i.e. the mixture is so close to being combusted that it doesn't need a massive spark to activate the combustion (potential energy is much higher than in a NA car, so a glowing plug is enough to ignite it too early in the cycle, damaging pistons, rods, valves, etc.

And yes, apparently it's called "fouling." The mixture doesn't combust well which can clog up the plug with unburnt fuel. Far less disastrous than pre-igntion tho.