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Spark Plug Recommendations Hot or Cold

M

Misterrobot

Member
The last time a posted a Q like this they kicked me out of Baylinerownersclub.org. LOL That’s when I bought the Gibson! (LOL, just kidding)

Takes deep breath….

The 1980 Crusader Model 270 manual I found online says to use Champion RV8C sparkplug. This looks like a cool plug compared to the info below. The tip does not protrude beyond the end of the spark plug and into the cylinder head.

On sparkplus.com and swordfish.com and champion.com the plug recommended is a Champion RV12YC with is a “hotter” plug as the tip is slightly extended beyond the end of the plug threads

Sighs….

Opinions?

I put in the Autolite equivalent on one engine and the AC equivalent on the other side (Don’t ask why the diff brands) and things sound good. Starboard engine blows black crap out and I am sure that is because the carb runs rich.

Capt Ron
Landed boat at marina 1 2 3 times now.
 
On the champion plugs, the heat range is determined by the number (8 vs 12) and nothing else. The projected tip is designated by the Y in the suffix of the plug number. And not everybody uses the heat range numbers the same way.....

FWIW, spark plug technology has evolved to help maintain engine performance with the stuff they now sell as gasoline. I doubt the original OEM manual's recommendation is still optimal. I'd go to the plug OEM application catalog and start from there.

As far as brands, ask five people and get five answers. I'd suggest experiment and see what works for you. Personally, been very happy with the plain old NGK plugs for over 20 years. Many Plug makers offer a 'marine' version which will usually tolerate the environment much better than an auto grade plug.
 
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