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techtalk:evo:engmech03 [2019/05/06 06:45]
ixl2relax [Check Your Cylinder Size With a Straw] 		techtalk:evo:engmech03 [2019/08/01 03:53]
hippysmack [EVO: Engine Mechanicals]
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 ====== EVO: Engine Mechanicals ====== ====== EVO: Engine Mechanicals ======
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 +====== Cylinders, Heads, Pistons & Rods ======
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 +===== Sub Documents =====
 +  * [[techtalk:​evo:​engmech03a|Cylinder / Head Bolt Issues and Repair]]
 +  * [[techtalk:​evo:​engmech03b|Time-Sert Repair on Engine Case Cylinder / Head Stud Hole]]
  
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 **Results** The difference between the two readings should not be more than 10%. A low reading on either cylinder indicates a possible valve or piston ring issue. To determine which, pour about 1/2 teaspoon of oil into that cylinder through the spark plug hole. Then repeat the compression test. If the reading returns to normal the rings may be defective. If the compression does not increase to within 10% then the valves of that cylinder may require service. **Results** The difference between the two readings should not be more than 10%. A low reading on either cylinder indicates a possible valve or piston ring issue. To determine which, pour about 1/2 teaspoon of oil into that cylinder through the spark plug hole. Then repeat the compression test. If the reading returns to normal the rings may be defective. If the compression does not increase to within 10% then the valves of that cylinder may require service.
 +
 +Compression test results vary on stock models but, typical rule-of-thumb is a minimum of 120PSI for 883 engines & 150PSI for 1200 engines.
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