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lead supplement
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   Forward Look Technical Discussions -> Engine, Exhaust, Fuel and IgnitionMessage format
 
johnnybiz
Posted 2018-05-20 3:15 PM (#563704)
Subject: lead supplement


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does anyone use a gas lead supplement in there forward look cars
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BigBlockMopar
Posted 2018-05-20 3:39 PM (#563706 - in reply to #563704)
Subject: Re: lead supplement



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No.
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1960fury
Posted 2018-05-21 7:50 AM (#563750 - in reply to #563704)
Subject: RE: lead supplement



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johnnybiz - 2018-05-20 3:15 PM

does anyone use a gas lead supplement in there forward look cars


Yes, as it does not only lubes the valve seats, it also lubes the cylinder walls/rings and valve stems. I do that for almost 30 years, engine still runs like new, drive almost daily, so it is safe: mix gasoline with teflon grease (slick50 etc), looks like milk and give a couple of shots into the tank each time when I fill up. Clogs paper filters but not the plastic one in the tank. So the oe tank filter and the Holley filter mesh in the carb is all i use. Works without any problems.
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Mopar1
Posted 2018-05-21 10:45 AM (#563757 - in reply to #563750)
Subject: Re: lead supplement



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For the most part it seems to be unnecessary, the epidemic of older cars having burned ex valves doesn't seem to have happened. Some FL engines came with hardend valves & seats, some didn't. What do you have?
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finsruskw
Posted 2018-05-21 12:30 PM (#563764 - in reply to #563704)
Subject: Re: lead supplement



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Happened to me!
50,000+ miles on the F since 1985.
2012, burnt 2 valves on the way home from the 300 Club spring meet in St. Louis.
Went w/hardened seats that time around.
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57chizler
Posted 2018-05-21 2:08 PM (#563768 - in reply to #563764)
Subject: Re: lead supplement



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I think the performance level of the engine dictates lead supplement use.
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BigBlockMopar
Posted 2018-05-21 3:51 PM (#563772 - in reply to #563704)
Subject: Re: lead supplement



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Burned valves could very well be caused by a (small) vacuumleak in the intake or carb-gasket, making a cylinder run lean, or a lean running carb all together.
Or someone hooked a PCV system (if fitted) onto a fitting located on an intake runner, again making 1 cylinder run lean.

My opinion is: By the time the valveseats are possibly worn by lack of lead(substitute), the heads themselves need to be rebuild anyway. So why not save it all in one repair?

And then again, besides a few enthusiasts, who is actually daily driving their FWLKer these days and rack up considerable miles every year?



Edited by BigBlockMopar 2018-05-21 3:52 PM
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1960fury
Posted 2018-05-21 4:31 PM (#563777 - in reply to #563704)
Subject: Re: lead supplement



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Burned valves? What in the lead supplement could prevent that? I'm with BigBlock here. At least I never heard about that.

Edited by 1960fury 2018-05-21 4:32 PM
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Viper Guy
Posted 2018-05-21 9:27 PM (#563794 - in reply to #563704)
Subject: Re: lead supplement



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I use it all the time. Not expensive and what harm is there? If even it helps a little, it's better than nothing.
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mikes2nd
Posted 2018-05-22 1:42 AM (#563806 - in reply to #563704)
Subject: Re: lead supplement


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our cars run a low rpm... unless your drag racing/high rpm or running 300k a year i wouldnt worry about it or use a lead substitute.

It imparts similar lubrication on high heat to the valves like lead oxide without ruining a catalytic converter and dumping lead.

https://www.redlineoil.com/lead-substitute

https://www.amazon.com/Motor-Medic-M5012-12PK-Lead-Substitute/dp/B00...

Lead was initially added for anti knock.. Lead increases the octane rating of gas... but it also dumps lead oxide on the valves which helps wear.

https://www.jalopyjournal.com/forum/threads/do-i-need-a-lead-substit...

https://www.wired.com/2013/01/looney-gas-and-lead-poisoning-a-short-...




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mikes2nd
Posted 2018-05-22 1:51 AM (#563808 - in reply to #563704)
Subject: Re: lead supplement


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https://shop.advanceautoparts.com/r/advice/car-maintenance/what-lead...
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big m
Posted 2018-05-22 11:16 AM (#563827 - in reply to #563704)
Subject: Re: lead supplement



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I've never personally used it, and I drive my old cars on very long trips.

I was told years ago, that most problems from unleaded fuel use in older cars, were those cars used for long high speed drives, and drag racing where engine temps raise very quickly.

This info was from an engine builder that raced in the Reno/Sacramento area in the seventies to the early nineties.

---John
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