Plugs

[commador]

Yes, I looked at the sticky. That thread on plugs got confusing to follow. So anyhow, with about 6 psi Will the NGK "7" be good? What is the part number for this plug? Thanks!

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[Unsung Boxer]

NGK BKR6E-11's are stock
NGK BKR7E-11's are one step colder.

using one step colder is similiar to retarding timing slightly, or using higher octane. It will make the spark plugs spark later. A by-product of this is that they will fould sooner.

Expect to pay 1.00 to 1.50 @ NAPA for either of these plugs. They will tell u that the number is not right, but trust me, it is.

[yamarocket630]

Originally posted by Unsung Boxer

using one step colder is similiar to retarding timing slightly, or using higher octane. It will make the spark plugs spark later. A by-product of this is that they will fould sooner.

that's the funniest shizzle I've ever heard! colder spark plugs don't fire later, and hotter plugs don't fire sooner. Electricity travels through a conductor at the speed of light, no hotter or colder plug can modify that basic law of physics. A spark plug can in no way delay or speed up the spark timing, it can only stop the spark by going completely open circuit or shorting to ground = no spark = misfire.

The difference between colder and hotter plugs is the amount of ceramic in contact with the metal shell. More ceramic in contact with the shell means more heat bleeds off into the cylinder head. This means the tip of the plug runs colder, and is less likely to get superheated enough to become it's own ignition source.

[commador]

Ok, so I want to get the NGK BKR7E-11. Thanks for the info!

[Unsung Boxer]

Originally posted by yamarocket630
that's the funniest shizzle I've ever heard! colder spark plugs don't fire later, and hotter plugs don't fire sooner. Electricity travels through a conductor at the speed of light, no hotter or colder plug can modify that basic law of physics. A spark plug can in no way delay or speed up the spark timing, it can only stop the spark by going completely open circuit or shorting to ground = no spark = misfire.

The difference between colder and hotter plugs is the amount of ceramic in contact with the metal shell. More ceramic in contact with the shell means more heat bleeds off into the cylinder head. This means the tip of the plug runs colder, and is less likely to get superheated enough to become it's own ignition source.

Well put, but your missing the point. Being its "own ignition source" is called Pre-Ignition, or Predetonation. In tuning terms, this is generally a sign that you need to retard timing, Richen the fuel mixture, or use a higher Octane fuel. Another method is to use a colder spark plug. This is why I said it was 'similiar'... no where did I say that it was the same.

But thanks anyways for trying to make an @$$ of me

-Jake