NGK Spark Plug

MrLarkins

MrLarkins

HS Math Teacher
What is the REAL difference between the B5HS, B6HS, and B7HS spark plug? I have the 6 and the 7. Don't know which is better and why it's better ^5
 
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For NGK spark plugs there is a simple rule of thumb:
Low heat rating number (for inst. BP4ES) "Hot spark plug".
high heat intake due to long insulator tip.
High heat rating number (for inst. BP8ES) "Cold spark plug".
Low heat intake, due to short insulator tip.
 
which is better for out happy times? i have the stock plug, a NGK B6HS, and a NGK B7HS

which should i run?
 
Well done Guys! As a "loose" rule every step up in heat range adds 10 degrees to combustion temp @ time of fire in m/s-2 Or thats the theory.
 
Which works best for ambient temps? some of us live in the desert where temps run over a 100 while others are in areas where ave temps are at 60.
 
In the desert or so cal, a 6 is best.

IMHO a 6 is the best bet for most of the country, with a 5 being a good selection for the cooler northern months.
 
funny thing is that it was cheaper than the regular plug, what do i look for to know if piston has had contact?
And would this plug make it run hotter?

I was able to easily get the bike above 50kmh - 30 mph but i backed off that type of speed on a bike worries me.
 
You would know if the piston hit the plug. There is room. Effectively you raised your compression ratio, but it shouldn't run any hotter.
 
if the piston could tap the plug your gap would disappear in a heart beat and your engine would quit the plug would ground out and could do some damage to the piston and bearing and be bad for other parts in there.
these engine have a hemi shaped combustion chamber and your plug would have to really stick down into the combustion chamber quite a bit to have the piston smack it.
most stock reach plugs should not be a problem but if your worried best to measure the clearance with the piston a tdc and then measure the plug to make sure they don't touch each other.rotfl
 
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