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Compression release systems are used to decrease effort required to start engine.
Holds the exhaust or intake valve slightly open during starting, and then allows it to fully close once
engine starts.
May be designed into camshaft and hold the valve open for a short period of time on every compression
stoke.
May be mechanical. Engages during starting and disengages after the engine reaches operating speed.
Compression release will affect the results from a compression test
There are some problems related to compression in
gas engines.
Two possible problems:
Inadequate compression
Excessive compression
Inadequate compression
Commonly caused by leaks
Excessive compression
Carbon Buildup
Harder starting (Slower crank speed or hard rope
pull)
Engine performance problems
Detonation
Pre-ignition
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