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Indiana Ken 07-30-2012 18:42:01 66.249.232.45 Report to Moderator

Typically an engine used at higher altitude can use a higher compression ratio without requiring a higher octane fuel. The higher compression helps in part to make up for the power reduction due to the less dense air. The typical way to get the increased compression is with higher dome pistons. Since the air is less dense the carburetor will need to be adjusted leaner. If the tractor is used at sea level it will have more power than the same tractor with standard pistons however, you will need to insure the fuel has adequate octane for use with the higher compression and dense sea level air. In addition the carburetor will need to be adjusted richer for the dense air. [Reply]   [No Email]