RCU Forums - measuring compression

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measuring compression

Is there a tool to check compression on a motor.
I have an OS .91 and It feels like it has low compression, but I am just not sure.

RE: measuring compression

I use the Armstrong gauge for measuring compression.

It is a relative measure compared to other engines or the same engine in the past

RE: measuring compression

Quote:

ORIGINAL: IllegalAlien

I have an OS .91 and It feels like it has low compression, but I am just not sure.

If it is a ringed engine, it can feel like it has low compression, in case your engine are a 4 stroke engine keep the trottle barrel open then compression feel better when you are testing compression.

But important of all: are the engine running well in idling and no trouble in trottling = compression are ok.

I never had a compression tester to measure compression in my engines. ;)

Edit: missing text..