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Re: Re: Re: Re: Lead substitutes and old tractors?
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Posted by Steve - IN on August 31, 2003 at 13:14:36 from (12.222.30.13):
In Reply to: Re: Re: Re: Lead substitutes and old tractors? posted by paul on August 31, 2003 at 12:30:53:
Paul is right about the valve seats.
Old tractors don't have nearly enough compression ratio to required higher octane gas (which once used lead to achieve higher octance). The only benefit to lead additives is to reduce the temperature between the valve and the valve seat to prevent "micro welding" which wears down the seat in old cast heads. As Paul says, don't spend your money on lead additives, hardened seats are a much more certain fix. One more trick to forestall the head work of installing hardened valve seats is to run a turn or two rich -- thereby lowering ignition temps at the sacrifice of a bit of performance -- to save the seats. Along with that trick you have to move up a heat range or two in plugs to avoid plug fouling. Other guys will say you get the same effect by pouring in 2 stroke oil in a 60:1 or 80:1 ratio to cool the exhaust valve to valve seat contact area, while running leaner to get a bit more performance at normal plug heat ranges. Don't know if anyone has any conclusive A/B comparison results on the above -- but you should have enough enough info to avoid wasting money on lead subs, and to give you some idea of tradeoffs involved.
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