Sparkplug question

[ryanjames170]

This is know is something of some peoples opinions but what do you guys figure are the best sparkplugs ie brand for vintage outboards? IE will give the best performance and what not.. i know NGK is the prefered with modern outboards but is it with the vintage stuff as well?

[garry-in-michigan]

Champion was the standard at one time. BUT since they were bought out by an overseas conglomerate. they have gone down hill. Sadly, the Japanese NGK has proven to be dependable and will probably be good until manufacturing is moved to China. . . 😕

[b-morrison]

is there a NGK/Champion chart/

[ryanjames170]

I could probably make one as I got access to cross reference stuff at work but I would need to know some spark plug types one would need

[outbdnut2]

There are online sites below (and others out there too) that cross reference, but some are incomplete and the sites don’t always agree with each other. The number in the middle of NGKs is the heat range and the higher the number, the colder the plug. If 2nd character is the letter R, it’s a resistor plug. If 2nd letter is a Z, it’s what NGK calls an "Inductive resistor" which is a small coil that blocks radio interference like resistor plugs do, but without soaking up as much energy as resistor plugs. If there is a dash number on the end, like -10, it is made to have a .010 larger gap than the same plug with no dash number.
Good Luck!
Dave

http://www.sparkplug-crossreference.com/

http://progreengrass.com/spark-plug-cross-reference-chart/

http://www.sparkplugcrossreference.co.uk/search/

This NGK site has a cross-reference function too:

https://www.ngk.com/Automotive-NGK-l1411.aspx

[ryanjames170]

I actually have from work a NGK book with cross reference tables in it. Got it with alot of other parts book. Boss said it was far better to just order Me books then to pay me to mess around looking up stuff in them at work.

[jerry-ahrens]

Personally, I like Champions in my older motors, but I have used some NGK’s with no problems. When you try to cross reference different brands in newer or current engines, that’s when you can run into trouble. Some newer OMC outboards, for example, must have Champions or they will experience driveabilty issues.

[ryanjames170]

quote Jerry Ahrens:

Personally, I like Champions in my older motors, but I have used some NGK’s with no problems. When you try to cross reference different brands in newer or current engines, that’s when you can run into trouble. Some newer OMC outboards, for example, must have Champions or they will experience driveabilty issues.

i might end up using champs in a few of my motors but i know the NGK’s are good how ever where i run into issues and i know the plugs are difrent is both a J8J and J6J cross to the same darn NGK plug B6S.. though ive had good luck with Autolites in stuff though.. FRAM makes better plugs then filters.. there filters are sub standard for the price of em

[Tubs]

I prefer AC’s but they don’t always cross over.

A "Boathouse Repair" is one that done without having tools or the skills to do it properly.

[chris-p]

Im like Tubs, if I can find the right ACs on the net, I buy em up.

I buy the Champion J6C in bulk, as I mainly deal in 50s OMCS, and run those plugs in almost all of my motors.

I think it is like the Chevy/Ford preference. Any brand will make a bad plug from time to time. Whomever bought that one bad plug, will forever detest them. There will be no changing their mind, so I don’t try.

Ive had bad plugs in all of the brands!

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