Question for The Marine Doctor

[turtle1173]

Sorry to call you out like this but I had a question for you about a previous post.<br /><br /> This is in regards to my 1972 85HP Chrysler but it will no doubt apply to others. You said that the correct plug to use is a Champion L76V instead of the L20V. I am wondering if this was a service bulletin or when did this come about? I'm not disputing what you said, I'm just prying for a fuller explanation because I hadn't heard that before.<br /><br /> You also mentioned that this was a "hotter" plug. I've heard that expression used several times but I haven't really understood what it meant. Does it create a hotter spark meaning that it burns the mixture better and more fully or does it produce more heat for the engine?<br /><br />Thanks a lot,<br /><br />Shane

 

[steelespike]

Re: Question for The Marine Doctor

Dont mean to butt in but:: My Aftermarket manual <br />(published in 72) indicates L20V plug for all<br /> 68 up 3 and 4 cyl. motors.<br /> Dont know where it stands in heat range.<br /> Heat range refers to the actual temperature<br /> the plug runs at.

 

[scotiany]

Re: Question for The Marine Doctor

Just to add my 2 cents, a hotter plug disipates heat more slowly than a colder plug. I don't think it has anything to do with the intensity of the spark. If it were my engine, I would stick to the plug that Steelspike recommends.

 

[eurolarva]

Re: Question for The Marine Doctor

The hotter the plug the longer the threaded part of the plug is. This puts the spark deeper into the cylinder getting it closer to the compressed gas. The plug does not produce more electricity, it is closser to the gas. The only reason I would say to use a hotter plug would be if you mainly troll. Trolling will foul plugs pretty fast.

 

[turtle1173]

Re: Question for The Marine Doctor

So, in essence, a "hotter" plug will help in a plug fouling situation?<br /><br />Shane

 

[eurolarva]

Re: Question for The Marine Doctor

It will help in a fouling situation however if you run too hot a plug when you are cruising you could damage your motor from excesive heat. Fouled plugs can be replaced for 2 bucks a piece. A burnt out motor priceless

 

[The Marine Doctor]

Re: Question for The Marine Doctor

Sorry to have not posted ealier...but I have been busy. The correct plug to us is the L76V or BUHW. If you have access to later model parts books you will see that the L76V is listed...Identical igntion systems.<br /><br />Yes the correct spark plug a long time ago.<br /><br />I have not installed L20V's...nor have I seen an L20V in a Chrysler product for a long time.<br /><br />TMD

 

[turtle1173]

Re: Question for The Marine Doctor

Thanks for the information. I went over to sparkplugs.com and they had a pretty good explanation about what a "hotter" plug is. Basically it said that the tip of the plug doesn't cool down as fast. Since it holds the heat more, it is less likely to foul.<br /><br /> One other question: Do most people use champion plugs in their Chryslers? Is there an advantage or difference in using NGK?<br /><br />Thanks again,<br /><br />Shane

 

[The Marine Doctor]

Re: Question for The Marine Doctor

I see engines come in all the time with either plug. Whenever I attend MerTech...the Tech's seem to always speak of NGK.<br /><br />TMD