Posted by Indiana Ken on July 30, 2012 at 18:42:01 from (66.249.232.45):
In Reply to: High-Altitude Engine posted by miner09 on July 30, 2012 at 10:38:30:
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.
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