need help asap- testing compression s13 sr20det cranking ?s

[handinpants]

I am testing the compression on my s13 sr20det, I want to know what the amount of full cranks i need to do to get an accurate reading. I am doing 5 cranks right now and got these readings. 145 -140-145-145 being the first reading is the pistion closest to the radiator.

please help because i need to know how many complete cranks i need to do to get the proper reading.

[obsolete]

5 cranks should be enough. should stop as soon as pressure stops going up.

[Monooxide]

Your compression is good, the main thing is to make sure the values are reasonably close to one another. Your readings could be low because of a crap gauge.

Previous poster is right, crank until the pressure stops going up.

[handinpants]

someone else told me this, i used a snapon guage though. my shop teacher says 5 cranks, but he's been building v8 hot rods for a while

[fliprayzin240sx]

5 cranks is enough...plus the number you got are pretty consistent for an SR20. If it lower than 125-130, then i'd start worrying.