Compression test merc 470

[wrestling_coach]

What numbers do I want to see when I complete a compression test on an '83 470 2bbl? Thanks in advance.

Dennis

 

[guyjg]

All cylinders should be comparatively equal in pressure between 5-10%...the higher the better. Run the engine to operating temperature then disable the ignition and pull all of the plugs. After a dry test cranking record the numbers and squirt a teaspoon of engine oil into each cylinder. Record the numbers and compare them w/the first test. There shouldn't be much difference on a good engine.

 

[wrestling_coach]

OK Thanks. You're the best. Take the rest of the week off.

Dennis