What is the proper way to do a Compression check?

[TURBOPOWERED68]

What is the proper way to do a Compression check?

I have done it like this in the past
1-run the car until it reaches normal operating temp.
2-disable the ignition
3-remove a spark plug
4-connect compression gauge
5-hold the Throttle at wide open position
6-then crank the engine a few times

Is this correct or should I or do I need to change something?

 

[bosted86]

i was told to remove all the plugs. crank the engine till the needle stops moving.

 

[Alky V6]

Yes. Remove all the plugs to take the load off the starter motor. You're going to check all the holes anyway. Usually 5 revolutions is enough to get a stable reading.

 

[TURBOPOWERED68]

thanks guys
what numbers am i looking for?
what would support go fast parts?

 

[vacuum 6]

thanks guys
what numbers am i looking for?
what would support go fast parts?

How many miles are on the engine?

 

[TURBOPOWERED68]

How many miles are on the engine?

not 100%
my guess is about 125K

 

[vacuum 6]

My guess ~100 psi. You dont want more than a 10% diff between cylinders.

 

[GNVYUS 1]

View points on WOT testing varies, I always forget to do it but WOT compression testing seems logical to me.

 

[bosted86]

mine with 88,000 miles was around 140psi across the board.