Yet another spark plug question

[Yellow Yota]

Alright. I've seen a lot of plug related threads lately, and the general consensus seems to be that you have to run marine plugs in our boats.
My question is: what makes a plug "marine"? I mean if you get the correct size plug, in the correct temperature range, and with the same electrode material (platinum, iridium, whatever), what else is there?

Other than the regular answer of needing a "marine" plug. I'll be more than happy to spend five times as much if there is some legitimate info or specs that make sense.

Not trying to ruffle feathers by any means. I just see the same answer of what plugs to run without much backup other than "because it's what the manufacturer specs". I'm looking at this like the oil threads. V/P lists different oils being approved than Merc does. When it's the same motors. Is there more to the plug story?


Thanks,
Chad

 

[mkast]

Re: Yet another spark plug question

http://www.acdelco.com/parts/spark-plugs/identification.jsp

 

[Rocky_Road]

Re: Yet another spark plug question

Alright. I've seen a lot of plug related threads lately, and the general consensus seems to be that you have to run marine plugs in our boats.
My question is: what makes a plug "marine"? I mean if you get the correct size plug, in the correct temperature range, and with the same electrode material (platinum, iridium, whatever), what else is there?

Other than the regular answer of needing a "marine" plug. I'll be more than happy to spend five times as much if there is some legitimate info or specs that make sense.

Not trying to ruffle feathers by any means. I just see the same answer of what plugs to run without much backup other than "because it's what the manufacturer specs". I'm looking at this like the oil threads. V/P lists different oils being approved than Merc does. When it's the same motors. Is there more to the plug story?


Thanks,
Chad

Marine plugs are constructed to resist corroding, and becoming 'one' with the engine head! They are better suited for the marine environment....

If you change your plugs every season, then this may not matter. But if you don't (like me), then it probably will.

 

[Yellow Yota]

Re: Yet another spark plug question

OK, so that tells us that my 41-932 plugs are sold as a manufacturers plug, and that they are a double platinum.
How do we determine the plug temperature when the numbers don't tell us? Other than that, it seems that I could use a double platinum plug from another source as long as the temp is the same and the dimensions are also the same.

As far as Merc's disclaimer, it appears to be nothing more than that. A god blanket clause to put in a manual to cover their rear ends!

I wonder what the "coating" is that resists corrosion. I always put anti-sieze on the threads of spark plugs so they will come out easier. Also, I normally am around aluminum heads, so it's even more important.