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Old 01-11-2015, 10:19 AM   #10 (permalink)
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The "island" is a range of speed (horizontal) in RPMs and load (vertical) in percentage of full (100%) load.

1500-2500 at no more that 80% of full load is a good average for gasoline engines, avoiding full load enrichment. In Diesels the load is closer to 100%.

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