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Re: Re: Re: Since leaded gasoline is gone.
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Posted by Matt Isserstedt on April 13, 1999 at 22:25:30:
In Reply to: Re: Re: Since leaded gasoline is gone. posted by paul on April 12, 1999 at 16:30:29:
I'd stick with the additive. My reason is that adding hardened valve seats to a cast iron cylinder head is not for the unskilled. The head has little ductility to absorb the plastic deformation of the press fit. And a light press can cause problems if the engine runs hot...the seat can get "dropped" which is a catastropic failure.
The other benefit of tetraethyl lead is that it boosts octane (not a big deal with tractors which were designed to run 70 octane juice) significantly at a surprisingly low cost. Not so good for the environment. I believe the newer additives use MMT which is enviro-safe.
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