Please varify plug reading 100 shot
Just do a 0-140 pull on a lonely stretch of highway and shut it down and pull off the road to swap out a few plugs for the drive home...
In an ideal world you would do all 8... But seriously, who wants to do that crap on the side of the road..lol
In an ideal world you would do all 8... But seriously, who wants to do that crap on the side of the road..lol
10 Second Club
Joined: Aug 2010
Posts: 4,470
Likes: 198
From: Harford Co. Maryland
Or on a Friday nite TNT at the end of the strip,in the dark,with a flashlight.
Cooler plug should only transfer heat away from the plug faster...shouldn't change timing but could change marks on strap I guess ? (but I wouldn't think much)
One thing that I was looking at was the discoloration in the cut-off threaded part (looked like a lot of heat ...purple/blue/gold)
Attachment 314235
One thing that I was looking at was the discoloration in the cut-off threaded part (looked like a lot of heat ...purple/blue/gold)
Attachment 314235
I didnt say changing to a colder/hotter plug changes the timing....
I said it changes the amount of heat the plug generates...
on a colder plug you can get away with more timing as it is less prone to pre-ignition...
you still are limited by the actual MBT... but its not as likely to fire early because its holding too much heat..
on the same account... you can use a hotter plug, with less timing...again..not ideal...
but you can stave off pre-ignition by pulling timing when you have too hot of a plug
Further away from MBT you get, the less cylinder pressure you get, and the less heat it produces..
wh do you think our cars are set up to pull timing when they start to overheat...
its partially to try to cool down the spark side of it to compensate for the engine side of it..
I said it changes the amount of heat the plug generates...
on a colder plug you can get away with more timing as it is less prone to pre-ignition...
you still are limited by the actual MBT... but its not as likely to fire early because its holding too much heat..
on the same account... you can use a hotter plug, with less timing...again..not ideal...
but you can stave off pre-ignition by pulling timing when you have too hot of a plug
Further away from MBT you get, the less cylinder pressure you get, and the less heat it produces..
wh do you think our cars are set up to pull timing when they start to overheat...
its partially to try to cool down the spark side of it to compensate for the engine side of it..
So people cut their plugs for no reason? What are these many other factors? I guess we have been doing it wrong for a long time...
Thread Starter
On The Tree
Joined: Aug 2009
Posts: 104
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With all my research and reading these forums i have always read from Graham and the guys this is the way to get a true plug read.Minimal idle time as possible, push the car up in the staging lanes ,burnout and full pass and shutdown.I dont think i did a 1/4 mile pass but would of been close.So should i get a few kms drive time before i do another pass on a fresh plug to maybe get a better read?
10 Second Club
Joined: Aug 2010
Posts: 4,470
Likes: 198
From: Harford Co. Maryland
A colder plug keeps from causing pre-ignition. Obviously more timing creates a hotter cylinder, but answer me this..... in your initial post you stated nothing about adjusting timing. Just about adjusting spark plug heat range, why is this?
Like I said in the earlier post...was discolored like it was very hot (purple/blue/gold in color)
With all my research and reading these forums i have always read from Graham and the guys this is the way to get a true plug read.Minimal idle time as possible, push the car up in the staging lanes ,burnout and full pass and shutdown.I dont think i did a 1/4 mile pass but would of been close.So should i get a few kms drive time before i do another pass on a fresh plug to maybe get a better read?
He needs to pull out four degrees of timing and make another pass. You can see the heat in the plug where the cadium is starting to burn off of the strap.
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Verdad Gallardo Thread Starter
On The Tree
Joined: Aug 2009
Posts: 104
Likes: 0
appreciate the help guys
I would never recommend a 1/4 mile pass to see where your tune up is, if your running a bigger shot and your tune is off it will get expensive. I dont even do a full 1/8 mile pass to check and then once thats good I'll go 1/8 mile then slowly keep going until you make a full 1/4 mile pass. I can easily read my plugs after 1/8 pass, but I am running a pretty good size shot though.
