I had the problem, for sure.

Posted by LJD on June 04, 2012 at 05:58:24 from (75.194.67.150):

In Reply to: Lead additive posted by Jerry Hrenchir on June 03, 2012 at 19:18:59:

Yes, a lead-substitute additive is expensive. Also, I doubt you'll find any verified tests to show if it actually works.

I'm using some now - simply because I had a case of it on my shelf that I bought over 15 years ago. I never bothered to use it UNTIL I had a verified problem. So now - what the heck. I already have it and might as well dump it in the tank.

Lead was added to gas to slow down the burn rate. It had the side-benefit of creating oxides when burnt that coated the valve seats and protected them. I'm sure there are other non-lead chemcials that do the same. Are they worth the money? That's your choice.

If your engine has original seats integral with the head casting and hasn't had a valve-grind -you probably have little to worry about.

If your engine has hardened valve seat inserts you also have little to worry about.

The problem is usually with integral seats that were originally induction hardened at the factory. Once somebody does a valve-job by regrinding, that hardness is lost. If the engine got run a lot on leaded gas afterwards - they could work-harden and also get a protective oxide coating. If done and only run with unleaded - they will wear prematurely.

I rebuilt my 1960 John Deere 1010 gas, including regrinding the seats and refacing the valves. After a couple of hundred hours of use, the valve seats wore so bad I lost ALL valve clearance and it would not run. Almost .020" in recession wear on the exhaust seats. I pulled it apart, readjusted the rocker arms and now it's fine. I'm also dumping in the additives I had laying around. So, I'll run for another 200 hours and see if it makes a difference. Not a perfect test since those seats may of work hardened a bit on their own.

I suspect people that tell you the additive is "snake oil" have no factual data on the subject. It is likely just a guess and emotional "knee jerk" reaction. They may be correct or may be 100% wrong. I've been hearing silly stories on the subject since the early 70s.
I DO know valve seat recession was a huge deal overseas and much more testing was done on it - along with additives. Some were shown to work.

If your machine is not used hard you have little to worry about anyway. My problems showed up after running my 1010 crawler for almost three weeks, almost all day, every day. It started having problems after running 200 gallons of gasoline through it on a pond job.

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