NGK Spark Plug

MrLarkins · #1 08-23-2008, 03:48 PM

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

**Dave31** · #2 08-23-2008, 05:34 PM

They have a different heat range

NGK.com

pedalpower · #3 08-23-2008, 05:41 PM

iirc the 5 is hotter than the 6

MrLarkins · #4 08-23-2008, 08:30 PM

6 is hotter than 7?

**Dave31** · #5 08-23-2008, 08:50 PM

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.

MrLarkins · #6 08-23-2008, 09:58 PM

which is better for out happy times? i have the stock plug, a NGK B6HS, and a NGK B7HS

which should i run?

Pablo · #7 08-23-2008, 10:57 PM

NGK B6HS but the 7 will work fine as well.

misteright1_99 · #8 08-23-2008, 11:28 PM

I run the B6HS and am very happy with it...

Saddletramp1200 · #9 08-23-2008, 11:29 PM

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.

Bikeguy Joe · #10 08-24-2008, 07:25 AM

Would that be 10 degrees C or F?