Spark Plug evaluation

[GrabberOrange69]

I think you’re in the ballpark, definitely not rich or fouling.

I‘ll add my voice for the RC9YC, which is one step colder.

 

[Geoff 2]

[1] Perhaps you, Bob, are unaware that your charge cooling scenario is no longer in vogue. Originally, the hot spark plug tip was thought to be the cause of pre-ign/detonation. So designers angled the plug closer to the intake valve so that the cooler incoming charge cooled the plug tip. Fast forward several decades & with better tools & more knowledge, it was discovered that the cause of the detonation was actually the hot area near the exh valve causing self ign of the A/F mixture. So modern engines have the plug nearer the exh valve to ignite that hot area first & reduce the possibility of self ign.
Read the article by Allen W. Cline, Engine Basics: Detonation & Pre-Ign written around 2000, 11 pages. I believe he is a GM engineer.
[2] Never heard of non-projected plugs solving fouling. Fouling was the very reason PT plugs were invented! From the Bosch Auto Handbook, 9th Edition, 1500+ pages: 'The use of materials with a higher thermal conductivity for center electrodes makes it possible to increase the insulator nose......This extends the spark plug operating range...& reduces the chance of soot formation.
[3] Power adder. I thought was obvious in this hobby. Nitrous, super or turbo charger.
[4] The heat range in bold type is self explanatory & needs no further explanation.

 

[Frank Mopar]

They can explain it better then I can.

Spark Plug - Construction & Technical Information | NGK

 

[RJRENTON]

[1] Perhaps you, Bob, are unaware that your charge cooling scenario is no longer in vogue. Originally, the hot spark plug tip was thought to be the cause of pre-ign/detonation. So designers angled the plug closer to the intake valve so that the cooler incoming charge cooled the plug tip. Fast forward several decades & with better tools & more knowledge, it was discovered that the cause of the detonation was actually the hot area near the exh valve causing self ign of the A/F mixture. So modern engines have the plug nearer the exh valve to ignite that hot area first & reduce the possibility of self ign.
Read the article by Allen W. Cline, Engine Basics: Detonation & Pre-Ign written around 2000, 11 pages. I believe he is a GM engineer.
[2] Never heard of non-projected plugs solving fouling. Fouling was the very reason PT plugs were invented! From the Bosch Auto Handbook, 9th Edition, 1500+ pages: 'The use of materials with a higher thermal conductivity for center electrodes makes it possible to increase the insulator nose......This extends the spark plug operating range...& reduces the chance of soot formation.
[3] Power adder. I thought was obvious in this hobby. Nitrous, super or turbo charger.
[4] The heat range in bold type is self explanatory & needs no further explanation.

I'm TOTALLY AWARE of your points......i just do not subscribe to the entire premise. Do not assume that your specific words, power adder, PT, etc mean the same thing to everyone. Quote the specific pages in the Robert Bosch hand book your refer to; I'll make my own determination if it applies or not. BTW....detonation is the process of the advancing pressure wave, from the previoudly spark ignited fuel mixture, compressing the still remaining unburned fuel charge, causing it to auto ignite, as in a diesel engine, reflecting back to the advancing flame front. When the flame fronts collide, a shock wave is generated, imposing a high shock load to the piston. This process is totally different than preignition, caused by hot carbon particles in the combustion chamber, igniting the fuel charge ahead of the ignition spark.
I'm a reasonably intelligent and educated person that does not need lectured to....I'll form my own opinions based on my interpretation of the subject matter. I would appreciate that consideration and I'll reciprocate. Any additional communication on this subject should be via Private Message.
BOB RENTON

 

[Geoff 2]

If you don't want to be lectured too, then don't lecture others. Page 643 in the Bosch Handbook.