Re: Lead substitute - use it or not.

Posted by Dirttracker on February 27, 2001 at 19:59:58 from (192.206.56.1):

In Reply to: Lead substitute - use it or not. posted by gibby on February 26, 2001 at 12:58:13:

Hi Gibby. If you have stellite valve seats the lead substitute isn't necessary, it is also a lubricant for valve stems and a spark knock suppressor which isn't needed in a low compression engine. Also higher octane gasoline doesn't benefit much if any without higher compression, much like high performance engines of any kind including methanol which is very high octane allowing compression ratio's up to 15 to 16 to 1. The low octane gas burns fast and hot and the higher octane gas is slower burning and cooler, thus allowing or needing more compression to make more horsepower. Low octane gas in a high compression engine will spark knock violently usually breaking pistons or burning the tops out of them. If the valve seats are cast iron or steel then lead substitute would be a good investment, if they are stellite just use an top lube such a Marvel Mystery oil.

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