scsmith
Well Known Member
For several years, I ran the DENSO W27EMR-C plugs that Claus sells with my Light Speed ignition.
The heat range of those looked just about right, the plugs were always pale tan/grey color.
For more availability, I wanted to switch to NGK, and I bought BR8ES plugs that several mentions on the forum seem to be the right ones. But now, the plugs are black with just a very light dusting of soot.
So, it looks like I need a slightly hotter plug. A look at the NGK website says that lower numbers are hotter plugs, suggesting that I should go to a BR7.
However, the cross reference chart for heat range on the DENSO chart shows that NGK BR9 is equivalent to DENSO W27.
I think the confusion is between the nomenclature of 'hotter plug' vs 'higher heat range' plug which I think actually needs to be a colder plug-carries heat away faster for operating at higher temps.
Anyway, the W27's worked well, so I think I want to buy the BR9ES. Is anyone else using BR9ES?
Next is the trick to figure out the right part number to get the solid tip instead of the loose tip. Found it -- p/n 3194 (BR9ES solid) at Advanced Auto parts, same price as the p/n 3961 (BR8ES Solid)
The heat range of those looked just about right, the plugs were always pale tan/grey color.
For more availability, I wanted to switch to NGK, and I bought BR8ES plugs that several mentions on the forum seem to be the right ones. But now, the plugs are black with just a very light dusting of soot.
So, it looks like I need a slightly hotter plug. A look at the NGK website says that lower numbers are hotter plugs, suggesting that I should go to a BR7.
However, the cross reference chart for heat range on the DENSO chart shows that NGK BR9 is equivalent to DENSO W27.
I think the confusion is between the nomenclature of 'hotter plug' vs 'higher heat range' plug which I think actually needs to be a colder plug-carries heat away faster for operating at higher temps.
Anyway, the W27's worked well, so I think I want to buy the BR9ES. Is anyone else using BR9ES?
Next is the trick to figure out the right part number to get the solid tip instead of the loose tip. Found it -- p/n 3194 (BR9ES solid) at Advanced Auto parts, same price as the p/n 3961 (BR8ES Solid)
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