NGK Spark Plug
- Thread starter MrLarkins
- Start date
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.
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.
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.
IMHO a 6 is the best bet for most of the country, with a 5 being a good selection for the cooler northern months.
I have been running the BPR6HS it seems ok so far, anyone know the difference between this one and the B6HS?
Resistor won't hurt anything, but it's the "P" part that bugs me. You don't want a projected tip, but I guess if it hasn't had piston contact, it's workin'!
http://www.ngksparkplugs.com/docs/tech/partnumberkey.pdf
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.
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.
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.