compression test numbers

[stevetwors]

i have a 92 nsx with 142,000 miles. i did a compression test the other day when replacing spark plugs.

the engine was cold.
i unplugged the connector on the right side of the engine bay which cuts fuel.
i removed all spark plugs.
i pushed the gas pedal to the floor.
i cranked it over and could hear when the cylinder being tested was compressing because that is when it would slow down momentarily. i did about 4 "compressions" per cylinder.

i got pretty much 240 across the board. one of them was more like 235.

did i do this right? are these good numbers?

i have a feeling the numbers would be much lower if the engine was warmed up, because i notice my car seems more peppy when its cold.

is a leak down test better and reveal more info about the health of the engine?

 

[stevetwors]

anyone? i know there are knowledgeable people here ...

 

[Stephen@NCAutoUSA]

anyone? i know there are knowledgeable people here ...

From what I know is that if all the numbers are the same or very close your good. I would do a leak down also though to check some other stuff also but if your only cylinder is only 5 off I wouldn't worry about it.

Stephen

 

[Big_D]

Those are good numbers. I wouldn't worry about a leak down test unless one of the cyls were off by 5% or more.

 

[stevetwors]

thanks for the responses! just wanted to make sure what i did was adequete to get proper readings.