Platinum plugs/small engines

[RickK]

Ok I swear I did it right the first time but,(?)RE platinum plugs,.does anyone know if they are available for small outboards> (5-20hp?) If they are available, has anyone used them? Feel they are useful? I like them in my car and they last a very long timeut I was wondering how they worked for small engines.

[eddie4]

Are you talking about those multi electrode models?

[Julio]

I have used plat plugs in severe duty use vehicles forever.On hard acceleration,cylinder pressures and coil voltages increase.Resulting in higher combustion temperatures.The platinum really sticks with ya.BUT, it can be blown away when the supporting material gets to hot during uncontrolled burn rates.Called detonation/valve rattle.I quit using the multiple ground electrode plugs cause there is just too much matter to be blown apart in a sensitive cyl.All thow some may suggest that the multiple electrodes are not always grns and that is correct. Help?

[perchjerker]

Personally. I like platinum plugs. Very resistant to fouling.
For example, way back when, I had an old Escort hand me down that oil fouled a plug due to bad valve seals about once a month. I put a plat plug in that cyl just to see what would happen. That plug lasted a year before it quit firing. I took it out, the only reason it quit was because carbon had closed the gap! I just chipped off the carbon and ran it for another year. (ahh, the good old days!!) LOL

Ford used plat plugs on the Aerostars, that beast had a few plugs that were a real bear to get to, Ford used them in that motor because they knew people would probably not bother changing the plug in that cylinder. Almost all the OEM plugs now are platinum, at least that I know about.

Try to find a cross reference with a Bosch plug, they have a pretty wide product line.
A plat plug has nothing to do with how many side electrodes a plug has, by the way.