Quote:
Originally Posted by csmith12
In simple terms.... If there isn't enough compression to force the controlled explosion inside either of engine cylinders, it will not run at all or run under a reduced amount of power output.
Reasons for loss of compression (educated guesses here)
Major Causes
Piston rings smoked
Broken piston arm
Hole in piston
Cracked Head
Cracked Case/piston sleeve (possibly a rod sticking out of side of engine)
Broken Valve
Semi Major Causes
Bent/Burnt Valve
Spark plug threads/Hole
Cam chain broken or Valve clearance VERY low ( leaving valve open)
Head Gasket Failure
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Added some
4 stroke engine process is: suck, squish, boom, blow.
No compression means the gas cannot be squished. No squish, no boom, engine quits.