lead aditive?

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lead aditive?

Postby Don_W » Fri Feb 09, 2018 10:45 am

I am looking for some input about using lead additive. I'm sure the Cub's originally ran on Regular Gasoline which is no longer available. Would it help prolong the engine life? Thanks for the input.

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Re: lead aditive?

Postby Barnyard » Fri Feb 09, 2018 10:48 am

No need for lead.
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Re: lead aditive?

Postby Slim140 » Fri Feb 09, 2018 10:54 am

Barnyard wrote:No need for lead.

I'll 2nd this.
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Re: lead aditive?

Postby Matt Kirsch » Fri Feb 09, 2018 10:57 am

Yes, completely unnecessary. Without going into a long-winded tirade on how these "lead substitute" products are complete shams, suffice it to say that there is no lead in these products, or anything that could/would serve the same purpose.

No need for any "mystery oil" or 2-stroke oil, or anything in the fuel except a good preservative product such as Sta-Bil.

The engines are best "preserved" by the fact that we don't take these tractors out and run them hard for 8-12 hours a day.

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Re: lead aditive?

Postby jsfarmall » Sat Feb 10, 2018 8:50 am

I have heard many many theories on using lead, mostly that it's not necessary. Mostly because of modern engine oil. I use rotella 15 40 which I been told has something in it for diesel engines which is good for these old gas tractor engines as well. I think the lead lubricated the upper cylinders and valves which the modern oils will do pretty good. I use lucas fuel additive which is also an upper cylinder lube. Don't know if it helps or not but a quart for 10 dollars will go a LONG ways in a cub. I haven't had one bit of issues either. And I run ETHANOL gas in everything I got. Not a problem yet.
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Re: lead aditive?

Postby Don McCombs » Sat Feb 10, 2018 9:12 am

Not that I consider Advance Auto to be a highly definitive source, but this explains things pretty well...

https://shop.advanceautoparts.com/r/adv ... ou-need-it
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Re: lead aditive?

Postby radioguy41 » Sat Feb 10, 2018 10:24 am

I ran my flat fender jeep for 14 years on E-10, using no additives. I had no issues, and it has more horsepower and reachs much higher RPM's than a Cub. While lead had some residual lubrication effect it's primary application was as an anti-knock additive. It accomplished this by raising the octane level. In the 1940's the octane rating of regular gas was 79 and later 81 so 87 octane E-10 will perform just fine in a Cub.

The reason some use diesel engine oil (I did in the jeep) is because it contains more ZDDP (or alternative) which is a lubricant necessary for flat tappet engines to prevent wear of the tappets and camshaft lobes but that problem rarely, if ever, displays on low RPM engines.
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Re: lead aditive?

Postby Eugene » Sat Feb 10, 2018 11:21 am

GSS-1408 Numbered Cub Service Manual. Valve spring test load: Intake 23 lbs. Exhaust 14 - 16 lbs.

With the low valve spring compression load, valves are not going to be hammered into valve seats. Very little wear on the cam lobes and lifters/tappets with the slow RPM engine.
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