Re: Unleaded gas or use a lead additive for new en

Posted by John T on August 30, 2006 at 06:25:37 from (66.244.90.5):

In Reply to: Unleaded gas or use a lead additive for new engine posted by scott#2 on August 30, 2006 at 05:23:13:

Scott, I take it you are working with an old tractor engine thats been rebuilt??? (Not near the compresion or RPM as say a high performance V8)

In addition to the anti knock properties afforded by "leaded" gas another benefit was how it softened/lubricated the valve face to valve seat impact to reduce wear and recission of the valve down into the seat plus it reduced sticking. One way to counteract that if you werent gonna use leaded gas was to use hardened valves and/or seats (if used in that engine) and I dont know if your rebuild involved that or not?????

Buttttttt regardless unless youre gonan run that engine longgggggg n hottttttttt n hardddddddd for extended periods, Id say it will take a longgggggggg time to wear the new valves n seats so bad it would be a problem and you could counteract that to some extent by checking n adjusting the valve lash time to time if ever needed.

Soooooooooooo not knowing what, IF ANY, help any snake oil or so called lead substitute could provide in the long haul I think Id do without it especially if you used hardened valves/seats in the overhaul. I just dont forsee any additive making all that much difference in valve wear and unless you really raised the compression drastically I sure dont see preignition or spark knock as any problem that would require the use of higher octane gasoline or any ant knock additive such as a lead substitute.

I reckon I agree with the other gents SAVE YOUR MONEY

John T

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